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1067 lines
31 KiB
1067 lines
31 KiB
// Boost.Units - A C++ library for zero-overhead dimensional analysis and |
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// unit/quantity manipulation and conversion |
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// |
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// Copyright (C) 2003-2008 Matthias Christian Schabel |
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// Copyright (C) 2007-2010 Steven Watanabe |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_UNITS_IO_HPP |
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#define BOOST_UNITS_IO_HPP |
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/// \file |
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/// \brief Stream input and output for rationals, units and quantities. |
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/// \details Functions and manipulators for output and input of units and quantities. |
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/// symbol and name format, and engineering and binary autoprefix. |
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/// Serialization output is also supported. |
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#include <cassert> |
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#include <cmath> |
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#include <string> |
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#include <iosfwd> |
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#include <ios> |
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#include <sstream> |
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#include <boost/serialization/nvp.hpp> |
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#include <boost/units/units_fwd.hpp> |
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#include <boost/units/heterogeneous_system.hpp> |
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#include <boost/units/make_scaled_unit.hpp> |
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#include <boost/units/quantity.hpp> |
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#include <boost/units/scale.hpp> |
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#include <boost/units/static_rational.hpp> |
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#include <boost/units/unit.hpp> |
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#include <boost/units/detail/utility.hpp> |
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namespace boost { |
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namespace serialization { |
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/// Boost Serialization library support for units. |
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template<class Archive,class System,class Dim> |
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inline void serialize(Archive& ar,boost::units::unit<Dim,System>&,const unsigned int /*version*/) |
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{ } |
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/// Boost Serialization library support for quantities. |
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template<class Archive,class Unit,class Y> |
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inline void serialize(Archive& ar,boost::units::quantity<Unit,Y>& q,const unsigned int /*version*/) |
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{ |
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ar & boost::serialization::make_nvp("value", units::quantity_cast<Y&>(q)); |
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} |
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} // namespace serialization |
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namespace units { |
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// get string representation of arbitrary type. |
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template<class T> std::string to_string(const T& t) |
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{ |
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std::stringstream sstr; |
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sstr << t; |
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return sstr.str(); |
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} |
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/// get string representation of integral-valued @c static_rational. |
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template<integer_type N> std::string to_string(const static_rational<N>&) |
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{ |
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return to_string(N); |
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} |
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/// get string representation of @c static_rational. |
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template<integer_type N, integer_type D> std::string to_string(const static_rational<N,D>&) |
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{ |
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return '(' + to_string(N) + '/' + to_string(D) + ')'; |
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} |
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/// Write @c static_rational to @c std::basic_ostream. |
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template<class Char, class Traits, integer_type N, integer_type D> |
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inline std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os,const static_rational<N,D>& r) |
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{ |
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os << to_string(r); |
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return os; |
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} |
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/// traits template for unit names. |
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template<class BaseUnit> |
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struct base_unit_info |
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{ |
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/// INTERNAL ONLY |
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typedef void base_unit_info_primary_template; |
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/// The full name of the unit (returns BaseUnit::name() by default) |
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static std::string name() |
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{ |
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return(BaseUnit::name()); |
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} |
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/// The symbol for the base unit (Returns BaseUnit::symbol() by default) |
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static std::string symbol() |
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{ |
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return(BaseUnit::symbol()); /// \returns BaseUnit::symbol(), for example "m" |
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} |
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}; |
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/// \enum format_mode format of output of units, for example "m" or "meter". |
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enum format_mode |
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{ |
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symbol_fmt = 0, /// default - reduces unit names to known symbols for both base and derived units. |
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name_fmt = 1, /// output full unit names for base and derived units, for example "meter". |
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raw_fmt = 2, /// output only symbols for base units (but not derived units), for example "m". |
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typename_fmt = 3, /// output demangled typenames (useful only for diagnosis). |
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fmt_mask = 3 /// Bits used for format. |
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}; |
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/// \enum autoprefix_mode automatic scaling and prefix (controlled by value of quantity) a, if any, |
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enum autoprefix_mode |
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{ |
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autoprefix_none = 0, /// No automatic prefix. |
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autoprefix_engineering = 4, /// Scale and prefix with 10^3 multiples, 1234.5 m output as 1.2345 km. |
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autoprefix_binary = 8, /// Scale and prefix with 2^10 (1024) multiples, 1024 as 1 kb. |
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autoprefix_mask = 12 /// Bits used for autoprefix. |
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}; |
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namespace detail { |
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template<bool> |
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struct xalloc_key_holder |
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{ |
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static int value; |
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static bool initialized; |
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}; |
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template<bool b> |
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int xalloc_key_holder<b>::value = 0; |
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template<bool b> |
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bool xalloc_key_holder<b>::initialized = 0; |
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struct xalloc_key_initializer_t |
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{ |
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xalloc_key_initializer_t() |
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{ |
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if (!xalloc_key_holder<true>::initialized) |
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{ |
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xalloc_key_holder<true>::value = std::ios_base::xalloc(); |
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xalloc_key_holder<true>::initialized = true; |
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} |
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} |
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}; |
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namespace /**/ { |
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xalloc_key_initializer_t xalloc_key_initializer; |
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} // namespace |
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} // namespace detail |
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/// returns flags controlling output. |
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inline long get_flags(std::ios_base& ios, long mask) |
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{ |
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return(ios.iword(detail::xalloc_key_holder<true>::value) & mask); |
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} |
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/// Set new flags controlling output format. |
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inline void set_flags(std::ios_base& ios, long new_flags, long mask) |
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{ |
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assert((~mask & new_flags) == 0); |
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long& flags = ios.iword(detail::xalloc_key_holder<true>::value); |
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flags = (flags & ~mask) | new_flags; |
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} |
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/// returns flags controlling output format. |
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inline format_mode get_format(std::ios_base& ios) |
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{ |
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return(static_cast<format_mode>((get_flags)(ios, fmt_mask))); |
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} |
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/// Set new flags controlling output format. |
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inline void set_format(std::ios_base& ios, format_mode new_mode) |
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{ |
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(set_flags)(ios, new_mode, fmt_mask); |
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} |
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/// Set new flags for type_name output format. |
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inline std::ios_base& typename_format(std::ios_base& ios) |
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{ |
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(set_format)(ios, typename_fmt); |
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return(ios); |
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} |
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/// set new flag for raw format output, for example "m". |
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inline std::ios_base& raw_format(std::ios_base& ios) |
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{ |
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(set_format)(ios, raw_fmt); |
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return(ios); |
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} |
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/// set new format flag for symbol output, for example "m". |
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inline std::ios_base& symbol_format(std::ios_base& ios) |
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{ |
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(set_format)(ios, symbol_fmt); |
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return(ios); |
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} |
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/// set new format for name output, for example "meter". |
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inline std::ios_base& name_format(std::ios_base& ios) |
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{ |
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(set_format)(ios, name_fmt); |
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return(ios); |
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} |
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/// get autoprefix flags for output. |
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inline autoprefix_mode get_autoprefix(std::ios_base& ios) |
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{ |
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return static_cast<autoprefix_mode>((get_flags)(ios, autoprefix_mask)); |
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} |
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/// Get format for output. |
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inline void set_autoprefix(std::ios_base& ios, autoprefix_mode new_mode) |
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{ |
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(set_flags)(ios, new_mode, autoprefix_mask); |
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} |
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/// Clear autoprefix flags. |
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inline std::ios_base& no_prefix(std::ios_base& ios) |
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{ |
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(set_autoprefix)(ios, autoprefix_none); |
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return ios; |
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} |
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/// Set flag for engineering prefix, so 1234.5 m displays as "1.2345 km". |
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inline std::ios_base& engineering_prefix(std::ios_base& ios) |
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{ |
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(set_autoprefix)(ios, autoprefix_engineering); |
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return ios; |
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} |
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/// Set flag for binary prefix, so 1024 byte displays as "1 Kib". |
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inline std::ios_base& binary_prefix(std::ios_base& ios) |
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{ |
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(set_autoprefix)(ios, autoprefix_binary); |
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return ios; |
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} |
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namespace detail { |
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/// \return exponent string like "^1/2". |
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template<integer_type N, integer_type D> |
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inline std::string exponent_string(const static_rational<N,D>& r) |
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{ |
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return '^' + to_string(r); |
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} |
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/// \return empty exponent string for integer rational like 2. |
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template<> |
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inline std::string exponent_string(const static_rational<1>&) |
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{ |
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return ""; |
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} |
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template<class T> |
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inline std::string base_unit_symbol_string(const T&) |
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{ |
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return base_unit_info<typename T::tag_type>::symbol() + exponent_string(typename T::value_type()); |
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} |
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template<class T> |
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inline std::string base_unit_name_string(const T&) |
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{ |
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return base_unit_info<typename T::tag_type>::name() + exponent_string(typename T::value_type()); |
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} |
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// stringify with symbols. |
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template<int N> |
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struct symbol_string_impl |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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typedef typename symbol_string_impl<N-1>::template apply<typename Begin::next> next; |
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static void value(std::string& str) |
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{ |
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str += base_unit_symbol_string(typename Begin::item()) + ' '; |
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next::value(str); |
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} |
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}; |
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}; |
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template<> |
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struct symbol_string_impl<1> |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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static void value(std::string& str) |
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{ |
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str += base_unit_symbol_string(typename Begin::item()); |
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}; |
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}; |
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}; |
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template<> |
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struct symbol_string_impl<0> |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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static void value(std::string& str) |
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{ |
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// better shorthand for dimensionless? |
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str += "dimensionless"; |
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} |
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}; |
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}; |
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template<int N> |
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struct scale_symbol_string_impl |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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static void value(std::string& str) |
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{ |
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str += Begin::item::symbol(); |
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scale_symbol_string_impl<N - 1>::template apply<typename Begin::next>::value(str); |
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} |
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}; |
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}; |
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template<> |
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struct scale_symbol_string_impl<0> |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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static void value(std::string&) { } |
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}; |
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}; |
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// stringify with names. |
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template<int N> |
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struct name_string_impl |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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typedef typename name_string_impl<N-1>::template apply<typename Begin::next> next; |
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static void value(std::string& str) |
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{ |
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str += base_unit_name_string(typename Begin::item()) + ' '; |
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next::value(str); |
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} |
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}; |
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}; |
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template<> |
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struct name_string_impl<1> |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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static void value(std::string& str) |
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{ |
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str += base_unit_name_string(typename Begin::item()); |
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}; |
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}; |
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}; |
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template<> |
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struct name_string_impl<0> |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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static void value(std::string& str) |
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{ |
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str += "dimensionless"; |
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} |
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}; |
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}; |
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template<int N> |
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struct scale_name_string_impl |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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static void value(std::string& str) |
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{ |
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str += Begin::item::name(); |
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scale_name_string_impl<N - 1>::template apply<typename Begin::next>::value(str); |
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} |
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}; |
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}; |
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template<> |
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struct scale_name_string_impl<0> |
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{ |
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template<class Begin> |
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struct apply |
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{ |
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static void value(std::string&) { } |
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}; |
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}; |
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} // namespace detail |
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namespace detail { |
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// These two overloads of symbol_string and name_string will |
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// will pick up homogeneous_systems. They simply call the |
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// appropriate function with a heterogeneous_system. |
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template<class Dimension,class System, class SubFormatter> |
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inline std::string |
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to_string_impl(const unit<Dimension,System>&, SubFormatter f) |
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{ |
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return f(typename reduce_unit<unit<Dimension, System> >::type()); |
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} |
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/// INTERNAL ONLY |
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// this overload picks up heterogeneous units that are not scaled. |
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template<class Dimension,class Units, class Subformatter> |
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inline std::string |
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to_string_impl(const unit<Dimension, heterogeneous_system<heterogeneous_system_impl<Units, Dimension, dimensionless_type> > >&, Subformatter f) |
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{ |
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std::string str; |
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f.template append_units_to<Units>(str); |
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return(str); |
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} |
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// This overload is a special case for heterogeneous_system which |
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// is really unitless |
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/// INTERNAL ONLY |
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template<class Subformatter> |
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inline std::string |
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to_string_impl(const unit<dimensionless_type, heterogeneous_system<heterogeneous_system_impl<dimensionless_type, dimensionless_type, dimensionless_type> > >&, Subformatter) |
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{ |
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return("dimensionless"); |
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} |
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// this overload deals with heterogeneous_systems which are unitless |
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// but scaled. |
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/// INTERNAL ONLY |
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template<class Scale, class Subformatter> |
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inline std::string |
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to_string_impl(const unit<dimensionless_type, heterogeneous_system<heterogeneous_system_impl<dimensionless_type, dimensionless_type, Scale> > >&, Subformatter f) |
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{ |
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std::string str; |
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f.template append_scale_to<Scale>(str); |
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return(str); |
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} |
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// this overload deals with scaled units. |
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/// INTERNAL ONLY |
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template<class Dimension,class Units,class Scale, class Subformatter> |
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inline std::string |
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to_string_impl(const unit<Dimension, heterogeneous_system<heterogeneous_system_impl<Units, Dimension, Scale> > >&, Subformatter f) |
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{ |
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std::string str; |
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f.template append_scale_to<Scale>(str); |
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std::string without_scale = f(unit<Dimension, heterogeneous_system<heterogeneous_system_impl<Units, Dimension, dimensionless_type> > >()); |
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if (f.is_default_string(without_scale, unit<Dimension, heterogeneous_system<heterogeneous_system_impl<Units, Dimension, dimensionless_type> > >())) |
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{ |
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str += "("; |
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str += without_scale; |
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str += ")"; |
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} |
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else |
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{ |
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str += without_scale; |
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} |
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return(str); |
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} |
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// This overload catches scaled units that have a single base unit |
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// raised to the first power. It causes si::nano * si::meters to not |
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// put parentheses around the meters. i.e. nm rather than n(m) |
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/// INTERNAL ONLY |
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template<class Dimension,class Unit,class Scale, class Subformatter> |
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inline std::string |
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to_string_impl(const unit<Dimension, heterogeneous_system<heterogeneous_system_impl<list<heterogeneous_system_dim<Unit, static_rational<1> >,dimensionless_type>, Dimension, Scale> > >&, Subformatter f) |
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{ |
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std::string str; |
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f.template append_scale_to<Scale>(str); |
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str += f(unit<Dimension, heterogeneous_system<heterogeneous_system_impl<list<heterogeneous_system_dim<Unit, static_rational<1> >, dimensionless_type>, Dimension, dimensionless_type> > >()); |
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return(str); |
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} |
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// This overload is necessary to disambiguate. |
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// it catches units that are unscaled and have a single |
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// base unit raised to the first power. It is treated the |
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// same as any other unscaled unit. |
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/// INTERNAL ONLY |
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template<class Dimension,class Unit,class Subformatter> |
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inline std::string |
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to_string_impl(const unit<Dimension, heterogeneous_system<heterogeneous_system_impl<list<heterogeneous_system_dim<Unit, static_rational<1> >,dimensionless_type>, Dimension, dimensionless_type> > >&, Subformatter f) |
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{ |
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std::string str; |
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f.template append_units_to<list<heterogeneous_system_dim<Unit, static_rational<1> >,dimensionless_type> >(str); |
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return(str); |
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} |
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|
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// This overload catches scaled units that have a single scaled base unit |
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// raised to the first power. It moves that scaling on the base unit |
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// to the unit level scaling and recurses. By doing this we make sure that |
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// si::milli * si::kilograms will print g rather than mkg. |
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// |
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// This transformation will not be applied if base_unit_info is specialized |
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// for the scaled base unit. |
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// |
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/// INTERNAL ONLY |
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template<class Dimension,class Unit,class UnitScale, class Scale, class Subformatter> |
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inline std::string |
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to_string_impl( |
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const unit< |
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Dimension, |
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heterogeneous_system< |
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heterogeneous_system_impl< |
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list<heterogeneous_system_dim<scaled_base_unit<Unit, UnitScale>, static_rational<1> >, dimensionless_type>, |
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Dimension, |
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Scale |
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> |
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> |
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>&, |
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Subformatter f, |
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typename base_unit_info<scaled_base_unit<Unit, UnitScale> >::base_unit_info_primary_template* = 0) |
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{ |
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return(f( |
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unit< |
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Dimension, |
|
heterogeneous_system< |
|
heterogeneous_system_impl< |
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list<heterogeneous_system_dim<Unit, static_rational<1> >, dimensionless_type>, |
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Dimension, |
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typename mpl::times<Scale, list<scale_list_dim<UnitScale>, dimensionless_type> >::type |
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> |
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> |
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>())); |
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} |
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|
|
// this overload disambuguates between the overload for an unscaled unit |
|
// and the overload for a scaled base unit raised to the first power. |
|
/// INTERNAL ONLY |
|
template<class Dimension,class Unit,class UnitScale,class Subformatter> |
|
inline std::string |
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to_string_impl( |
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const unit< |
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Dimension, |
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heterogeneous_system< |
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heterogeneous_system_impl< |
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list<heterogeneous_system_dim<scaled_base_unit<Unit, UnitScale>, static_rational<1> >, dimensionless_type>, |
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Dimension, |
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dimensionless_type |
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> |
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> |
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>&, |
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Subformatter f, |
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typename base_unit_info<scaled_base_unit<Unit, UnitScale> >::base_unit_info_primary_template* = 0) |
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{ |
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std::string str; |
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f.template append_units_to<list<heterogeneous_system_dim<scaled_base_unit<Unit, UnitScale>, static_rational<1> >, dimensionless_type> >(str); |
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return(str); |
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} |
|
|
|
struct format_raw_symbol_impl { |
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template<class Units> |
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void append_units_to(std::string& str) { |
|
detail::symbol_string_impl<Units::size::value>::template apply<Units>::value(str); |
|
} |
|
template<class Scale> |
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void append_scale_to(std::string& str) { |
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detail::scale_symbol_string_impl<Scale::size::value>::template apply<Scale>::value(str); |
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} |
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template<class Unit> |
|
std::string operator()(const Unit& u) { |
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return(to_string_impl(u, *this)); |
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} |
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template<class Unit> |
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bool is_default_string(const std::string&, const Unit&) { |
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return(true); |
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} |
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}; |
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|
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struct format_symbol_impl : format_raw_symbol_impl { |
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template<class Unit> |
|
std::string operator()(const Unit& u) { |
|
return(symbol_string(u)); |
|
} |
|
template<class Unit> |
|
bool is_default_string(const std::string& str, const Unit& u) { |
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return(str == to_string_impl(u, format_raw_symbol_impl())); |
|
} |
|
}; |
|
|
|
struct format_raw_name_impl { |
|
template<class Units> |
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void append_units_to(std::string& str) { |
|
detail::name_string_impl<(Units::size::value)>::template apply<Units>::value(str); |
|
} |
|
template<class Scale> |
|
void append_scale_to(std::string& str) { |
|
detail::scale_name_string_impl<Scale::size::value>::template apply<Scale>::value(str); |
|
} |
|
template<class Unit> |
|
std::string operator()(const Unit& u) { |
|
return(to_string_impl(u, *this)); |
|
} |
|
template<class Unit> |
|
bool is_default_string(const std::string&, const Unit&) { |
|
return(true); |
|
} |
|
}; |
|
|
|
struct format_name_impl : format_raw_name_impl { |
|
template<class Unit> |
|
std::string operator()(const Unit& u) { |
|
return(name_string(u)); |
|
} |
|
template<class Unit> |
|
bool is_default_string(const std::string& str, const Unit& u) { |
|
return(str == to_string_impl(u, format_raw_name_impl())); |
|
} |
|
}; |
|
|
|
template<class Char, class Traits> |
|
inline void do_print(std::basic_ostream<Char, Traits>& os, const std::string& s) |
|
{ |
|
os << s.c_str(); |
|
} |
|
|
|
inline void do_print(std::ostream& os, const std::string& s) |
|
{ |
|
os << s; |
|
} |
|
|
|
template<class Char, class Traits> |
|
inline void do_print(std::basic_ostream<Char, Traits>& os, const char* s) |
|
{ |
|
os << s; |
|
} |
|
|
|
// For automatically applying the appropriate prefixes. |
|
|
|
} |
|
|
|
#ifdef BOOST_UNITS_DOXYGEN |
|
|
|
/// ADL customization point for automatic prefixing. |
|
/// Returns a non-negative value. Implemented as std::abs |
|
/// for built-in types. |
|
template<class T> |
|
double autoprefix_norm(const T& arg); |
|
|
|
#else |
|
|
|
template<class T, bool C = boost::is_arithmetic<T>::value> |
|
struct autoprefix_norm_impl; |
|
|
|
template<class T> |
|
struct autoprefix_norm_impl<T, true> |
|
{ |
|
typedef double type; |
|
static double call(const T& arg) { return std::abs(arg); } |
|
}; |
|
|
|
template<class T> |
|
struct autoprefix_norm_impl<T, false> |
|
{ |
|
typedef one type; |
|
static one call(const T&) { return one(); } |
|
}; |
|
|
|
template<class T> |
|
typename autoprefix_norm_impl<T>::type autoprefix_norm(const T& arg) |
|
{ |
|
return autoprefix_norm_impl<T>::call(arg); |
|
} |
|
|
|
#endif |
|
|
|
namespace detail { |
|
|
|
template<class End, class Prev, class T, class F> |
|
bool find_matching_scale_impl(End, End, Prev, T, double, F) |
|
{ |
|
return false; |
|
} |
|
|
|
template<class Begin, class End, class Prev, class T, class F> |
|
bool find_matching_scale_impl(Begin, End end, Prev prev, T t, double x, F f) |
|
{ |
|
if(Begin::item::value() > x) { |
|
f(prev, t); |
|
return true; |
|
} else { |
|
return detail::find_matching_scale_impl( |
|
typename Begin::next(), |
|
end, |
|
typename Begin::item(), |
|
t, |
|
x, |
|
f |
|
); |
|
} |
|
} |
|
|
|
template<class End, class T, class F> |
|
bool find_matching_scale_i(End, End, T, double, F) |
|
{ |
|
return false; |
|
} |
|
|
|
template<class Begin, class End, class T, class F> |
|
bool find_matching_scale_i(Begin, End end, T t, double x, F f) |
|
{ |
|
if(Begin::item::value() > x) { |
|
return false; |
|
} else { |
|
return detail::find_matching_scale_impl(typename Begin::next(), end, typename Begin::item(), t, x, f); |
|
} |
|
} |
|
|
|
template<class Scales, class T, class F> |
|
bool find_matching_scale(T t, double x, F f) |
|
{ |
|
return detail::find_matching_scale_i(Scales(), dimensionless_type(), t, x, f); |
|
} |
|
|
|
typedef list<scale<10, static_rational<-24> >, |
|
list<scale<10, static_rational<-21> >, |
|
list<scale<10, static_rational<-18> >, |
|
list<scale<10, static_rational<-15> >, |
|
list<scale<10, static_rational<-12> >, |
|
list<scale<10, static_rational<-9> >, |
|
list<scale<10, static_rational<-6> >, |
|
list<scale<10, static_rational<-3> >, |
|
list<scale<10, static_rational<0> >, |
|
list<scale<10, static_rational<3> >, |
|
list<scale<10, static_rational<6> >, |
|
list<scale<10, static_rational<9> >, |
|
list<scale<10, static_rational<12> >, |
|
list<scale<10, static_rational<15> >, |
|
list<scale<10, static_rational<18> >, |
|
list<scale<10, static_rational<21> >, |
|
list<scale<10, static_rational<24> >, |
|
list<scale<10, static_rational<27> >, |
|
dimensionless_type> > > > > > > > > > > > > > > > > > engineering_prefixes; |
|
|
|
typedef list<scale<2, static_rational<10> >, |
|
list<scale<2, static_rational<20> >, |
|
list<scale<2, static_rational<30> >, |
|
list<scale<2, static_rational<40> >, |
|
list<scale<2, static_rational<50> >, |
|
list<scale<2, static_rational<60> >, |
|
list<scale<2, static_rational<70> >, |
|
dimensionless_type> > > > > > > binary_prefixes; |
|
|
|
template<class Os, class Quantity> |
|
struct print_default_t { |
|
typedef void result_type; |
|
void operator()() const |
|
{ |
|
*os << q->value() << ' ' << typename Quantity::unit_type(); |
|
} |
|
Os* os; |
|
const Quantity* q; |
|
}; |
|
|
|
template<class Os, class Quantity> |
|
print_default_t<Os, Quantity> print_default(Os& os, const Quantity& q) |
|
{ |
|
print_default_t<Os, Quantity> result = { &os, &q }; |
|
return result; |
|
} |
|
|
|
template<class Os> |
|
struct print_scale_t { |
|
typedef void result_type; |
|
template<class Prefix, class T> |
|
void operator()(Prefix, const T& t) const |
|
{ |
|
*prefixed = true; |
|
*os << t / Prefix::value() << ' '; |
|
switch(units::get_format(*os)) { |
|
case name_fmt: do_print(*os, Prefix::name()); break; |
|
case raw_fmt: |
|
case symbol_fmt: do_print(*os, Prefix::symbol()); break; |
|
case typename_fmt: do_print(*os, units::simplify_typename(Prefix())); *os << ' '; break; |
|
} |
|
} |
|
template<long N, class T> |
|
void operator()(scale<N, static_rational<0> >, const T& t) const |
|
{ |
|
*prefixed = false; |
|
*os << t << ' '; |
|
} |
|
Os* os; |
|
bool* prefixed; |
|
}; |
|
|
|
template<class Os> |
|
print_scale_t<Os> print_scale(Os& os, bool& prefixed) |
|
{ |
|
print_scale_t<Os> result = { &os, &prefixed }; |
|
return result; |
|
} |
|
|
|
// puts parentheses around a unit |
|
/// INTERNAL ONLY |
|
template<class Dimension,class Units,class Scale, class Subformatter> |
|
inline std::string |
|
maybe_parenthesize(const unit<Dimension, heterogeneous_system<heterogeneous_system_impl<Units, Dimension, Scale> > >&, Subformatter f) |
|
{ |
|
std::string str; |
|
|
|
std::string without_scale = f(unit<Dimension, heterogeneous_system<heterogeneous_system_impl<Units, Dimension, dimensionless_type> > >()); |
|
|
|
if (f.is_default_string(without_scale, unit<Dimension, heterogeneous_system<heterogeneous_system_impl<Units, Dimension, dimensionless_type> > >())) |
|
{ |
|
str += "("; |
|
str += without_scale; |
|
str += ")"; |
|
} |
|
else |
|
{ |
|
str += without_scale; |
|
} |
|
|
|
return(str); |
|
} |
|
|
|
// This overload catches scaled units that have a single base unit |
|
// raised to the first power. It causes si::nano * si::meters to not |
|
// put parentheses around the meters. i.e. nm rather than n(m) |
|
/// INTERNAL ONLY |
|
template<class Dimension,class Unit,class Scale, class Subformatter> |
|
inline std::string |
|
maybe_parenthesize(const unit<Dimension, heterogeneous_system<heterogeneous_system_impl<list<heterogeneous_system_dim<Unit, static_rational<1> >,dimensionless_type>, Dimension, Scale> > >&, Subformatter f) |
|
{ |
|
return f(unit<Dimension, heterogeneous_system<heterogeneous_system_impl<list<heterogeneous_system_dim<Unit, static_rational<1> >, dimensionless_type>, Dimension, dimensionless_type> > >()); |
|
} |
|
|
|
template<class Prefixes, class CharT, class Traits, class Unit, class T, class F> |
|
void do_print_prefixed_impl(std::basic_ostream<CharT, Traits>& os, const quantity<Unit, T>& q, F default_) |
|
{ |
|
bool prefixed; |
|
if(detail::find_matching_scale<Prefixes>(q.value(), autoprefix_norm(q.value()), detail::print_scale(os, prefixed))) { |
|
if(prefixed) { |
|
switch(units::get_format(os)) { |
|
case symbol_fmt: do_print(os, maybe_parenthesize(Unit(), format_symbol_impl())); break; |
|
case raw_fmt: do_print(os, maybe_parenthesize(Unit(), format_raw_symbol_impl())); break; |
|
case name_fmt: do_print(os, maybe_parenthesize(Unit(), format_name_impl())); break; |
|
case typename_fmt: do_print(os, simplify_typename(Unit())); break; |
|
} |
|
} else { |
|
os << Unit(); |
|
} |
|
} else { |
|
default_(); |
|
} |
|
} |
|
|
|
// Handle units like si::kilograms that have a scale embedded in the |
|
// base unit. This overload is disabled if the scaled base unit has |
|
// a user-defined string representation. |
|
template<class Prefixes, class CharT, class Traits, class Dimension, class BaseUnit, class BaseScale, class Scale, class T> |
|
typename base_unit_info< |
|
scaled_base_unit<BaseUnit, Scale> |
|
>::base_unit_info_primary_template |
|
do_print_prefixed( |
|
std::basic_ostream<CharT, Traits>& os, |
|
const quantity< |
|
unit< |
|
Dimension, |
|
heterogeneous_system< |
|
heterogeneous_system_impl< |
|
list< |
|
heterogeneous_system_dim< |
|
scaled_base_unit<BaseUnit, BaseScale>, |
|
static_rational<1> |
|
>, |
|
dimensionless_type |
|
>, |
|
Dimension, |
|
Scale |
|
> |
|
> |
|
>, |
|
T |
|
>& q) |
|
{ |
|
quantity< |
|
unit< |
|
Dimension, |
|
heterogeneous_system< |
|
heterogeneous_system_impl< |
|
list< |
|
heterogeneous_system_dim<BaseUnit, static_rational<1> >, |
|
dimensionless_type |
|
>, |
|
Dimension, |
|
dimensionless_type |
|
> |
|
> |
|
>, |
|
T |
|
> unscaled(q); |
|
detail::do_print_prefixed_impl<Prefixes>(os, unscaled, detail::print_default(os, q)); |
|
} |
|
|
|
template<class Prefixes, class CharT, class Traits, class Dimension, class L, class Scale, class T> |
|
void do_print_prefixed( |
|
std::basic_ostream<CharT, Traits>& os, |
|
const quantity< |
|
unit< |
|
Dimension, |
|
heterogeneous_system< |
|
heterogeneous_system_impl< |
|
L, |
|
Dimension, |
|
Scale |
|
> |
|
> |
|
>, |
|
T |
|
>& q) |
|
{ |
|
quantity< |
|
unit< |
|
Dimension, |
|
heterogeneous_system< |
|
heterogeneous_system_impl< |
|
L, |
|
Dimension, |
|
dimensionless_type |
|
> |
|
> |
|
>, |
|
T |
|
> unscaled(q); |
|
detail::do_print_prefixed_impl<Prefixes>(os, unscaled, detail::print_default(os, q)); |
|
} |
|
|
|
template<class Prefixes, class CharT, class Traits, class Dimension, class System, class T> |
|
void do_print_prefixed(std::basic_ostream<CharT, Traits>& os, const quantity<unit<Dimension, System>, T>& q) |
|
{ |
|
detail::do_print_prefixed<Prefixes>(os, quantity<unit<Dimension, typename make_heterogeneous_system<Dimension, System>::type>, T>(q)); |
|
} |
|
|
|
template<class Prefixes, class CharT, class Traits, class Unit, class T> |
|
void do_print_prefixed(std::basic_ostream<CharT, Traits>& os, const quantity<Unit, T>& q) |
|
{ |
|
detail::print_default(os, q)(); |
|
} |
|
|
|
template<class Prefixes, class CharT, class Traits, class Unit, class T> |
|
void maybe_print_prefixed(std::basic_ostream<CharT, Traits>& os, const quantity<Unit, T>& q, mpl::true_) |
|
{ |
|
detail::do_print_prefixed<Prefixes>(os, q); |
|
} |
|
|
|
template<class Prefixes, class CharT, class Traits, class Unit, class T> |
|
void maybe_print_prefixed(std::basic_ostream<CharT, Traits>& os, const quantity<Unit, T>& q, mpl::false_) |
|
{ |
|
detail::print_default(os, q)(); |
|
} |
|
|
|
inline mpl::true_ test_norm(double) { return mpl::true_(); } |
|
inline mpl::false_ test_norm(one) { return mpl::false_(); } |
|
|
|
} // namespace detail |
|
|
|
template<class Dimension,class System> |
|
inline std::string |
|
typename_string(const unit<Dimension, System>&) |
|
{ |
|
return simplify_typename(typename reduce_unit< unit<Dimension,System> >::type()); |
|
} |
|
|
|
template<class Dimension,class System> |
|
inline std::string |
|
symbol_string(const unit<Dimension, System>&) |
|
{ |
|
return detail::to_string_impl(unit<Dimension,System>(), detail::format_symbol_impl()); |
|
} |
|
|
|
template<class Dimension,class System> |
|
inline std::string |
|
name_string(const unit<Dimension, System>&) |
|
{ |
|
return detail::to_string_impl(unit<Dimension,System>(), detail::format_name_impl()); |
|
} |
|
|
|
/// Print a @c unit as a list of base units and their exponents. |
|
/// |
|
/// for @c symbol_format outputs e.g. "m s^-1" or "J". |
|
/// for @c name_format outputs e.g. "meter second^-1" or "joule". |
|
/// for @c raw_format outputs e.g. "m s^-1" or "meter kilogram^2 second^-2". |
|
/// for @c typename_format outputs the typename itself (currently demangled only on GCC). |
|
template<class Char, class Traits, class Dimension, class System> |
|
inline std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, const unit<Dimension, System>& u) |
|
{ |
|
if (units::get_format(os) == typename_fmt) |
|
{ |
|
detail::do_print(os, typename_string(u)); |
|
} |
|
else if (units::get_format(os) == raw_fmt) |
|
{ |
|
detail::do_print(os, detail::to_string_impl(u, detail::format_raw_symbol_impl())); |
|
} |
|
else if (units::get_format(os) == symbol_fmt) |
|
{ |
|
detail::do_print(os, symbol_string(u)); |
|
} |
|
else if (units::get_format(os) == name_fmt) |
|
{ |
|
detail::do_print(os, name_string(u)); |
|
} |
|
else |
|
{ |
|
assert(!"The format mode must be one of: typename_format, raw_format, name_format, symbol_format"); |
|
} |
|
|
|
return(os); |
|
} |
|
|
|
/// \brief Print a @c quantity. |
|
/// \details Prints the value followed by the unit. |
|
/// If the engineering_prefix, or binary_prefix is set, |
|
/// tries to scale the value appropriately. |
|
/// For example, it might print 12.345 km instead of 12345 m. |
|
/// (Note does @b not attempt to automatically scale scalars like double, float...) |
|
template<class Char, class Traits, class Unit, class T> |
|
inline std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, const quantity<Unit, T>& q) |
|
{ |
|
if (units::get_autoprefix(os) == autoprefix_none) |
|
{ |
|
os << q.value() << ' ' << Unit(); |
|
} |
|
else if (units::get_autoprefix(os) == autoprefix_engineering) |
|
{ |
|
detail::maybe_print_prefixed<detail::engineering_prefixes>(os, q, detail::test_norm(autoprefix_norm(q.value()))); |
|
} |
|
else if (units::get_autoprefix(os) == autoprefix_binary) |
|
{ |
|
detail::maybe_print_prefixed<detail::binary_prefixes>(os, q, detail::test_norm(autoprefix_norm(q.value()))); |
|
} |
|
else |
|
{ |
|
assert(!"Autoprefixing must be one of: no_prefix, engineering_prefix, binary_prefix"); |
|
} |
|
return(os); |
|
} |
|
|
|
} // namespace units |
|
|
|
} // namespace boost |
|
|
|
#endif
|
|
|