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114 lines
3.8 KiB
114 lines
3.8 KiB
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
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// (C) Copyright 2004-2007 Jonathan Turkanis |
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// Distributed under the Boost Software License, Version 1.0. (See accompanying |
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
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// See http://www.boost.org/libs/iostreams for documentation. |
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// Contains the definition of the class template |
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// boost::iostreams::detail::double_object, which is similar to compressed pair |
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// except that both members of the pair have the same type, and |
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// compression occurs only if requested using a boolean template |
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// parameter. |
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#ifndef BOOST_IOSTREAMS_DETAIL_DOUBLE_OBJECT_HPP_INCLUDED |
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#define BOOST_IOSTREAMS_DETAIL_DOUBLE_OBJECT_HPP_INCLUDED |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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#include <algorithm> // swap. |
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#include <boost/detail/workaround.hpp> |
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#include <boost/mpl/if.hpp> |
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#if BOOST_WORKAROUND(__MWERKS__, > 0x3003) |
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# include <msl_utility> |
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#else |
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# include <boost/call_traits.hpp> |
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#endif |
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namespace boost { namespace iostreams { namespace detail { |
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template<typename T> |
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class single_object_holder { |
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public: |
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#if BOOST_WORKAROUND(__MWERKS__, > 0x3003) |
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typedef Metrowerks::call_traits<T> traits_type; |
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#else |
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typedef boost::call_traits<T> traits_type; |
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#endif |
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typedef typename traits_type::param_type param_type; |
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typedef typename traits_type::reference reference; |
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typedef typename traits_type::const_reference const_reference; |
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single_object_holder() { } |
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single_object_holder(param_type t) : first_(t) { } |
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reference first() { return first_; } |
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const_reference first() const { return first_; } |
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reference second() { return first_; } |
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const_reference second() const { return first_; } |
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void swap(single_object_holder& o) |
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{ std::swap(first_, o.first_); } |
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private: |
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T first_; |
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}; |
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template<typename T> |
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struct double_object_holder { |
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public: |
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#if BOOST_WORKAROUND(__MWERKS__, > 0x3003) |
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typedef Metrowerks::call_traits<T> traits_type; |
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#else |
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typedef boost::call_traits<T> traits_type; |
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#endif |
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typedef typename traits_type::param_type param_type; |
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typedef typename traits_type::reference reference; |
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typedef typename traits_type::const_reference const_reference; |
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double_object_holder() { } |
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double_object_holder(param_type t1, param_type t2) |
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: first_(t1), second_(t2) { } |
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reference first() { return first_; } |
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const_reference first() const { return first_; } |
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reference second() { return second_; } |
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const_reference second() const { return second_; } |
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void swap(double_object_holder& d) |
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{ |
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std::swap(first_, d.first_); |
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std::swap(second_, d.second_); |
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} |
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private: |
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T first_, second_; |
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}; |
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template<typename T, typename IsDouble> |
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class double_object |
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: public mpl::if_< |
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IsDouble, |
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double_object_holder<T>, |
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single_object_holder<T> |
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>::type |
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{ |
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private: |
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typedef typename |
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mpl::if_< |
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IsDouble, |
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double_object_holder<T>, |
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single_object_holder<T> |
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>::type base_type; |
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public: |
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#if BOOST_WORKAROUND(__MWERKS__, > 0x3003) |
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typedef Metrowerks::call_traits<T> traits_type; |
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#else |
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typedef boost::call_traits<T> traits_type; |
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#endif |
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typedef typename traits_type::param_type param_type; |
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typedef typename traits_type::reference reference; |
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typedef typename traits_type::const_reference const_reference; |
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double_object() : base_type() {} |
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double_object(param_type t1, param_type t2) |
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: base_type(t1, t2) { } |
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bool is_double() const { return IsDouble::value; } |
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}; |
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} } } // End namespaces detail, iostreams, boost. |
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_DOUBLE_OBJECT_HPP_INCLUDED
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