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101 lines
2.5 KiB
101 lines
2.5 KiB
/* Boost interval/rounding.hpp template implementation file |
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* |
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* Copyright 2002-2003 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion |
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* |
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* Distributed under the Boost Software License, Version 1.0. |
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* (See accompanying file LICENSE_1_0.txt or |
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* copy at http://www.boost.org/LICENSE_1_0.txt) |
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*/ |
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#ifndef BOOST_NUMERIC_INTERVAL_ROUNDING_HPP |
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#define BOOST_NUMERIC_INTERVAL_ROUNDING_HPP |
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namespace boost { |
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namespace numeric { |
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namespace interval_lib { |
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/* |
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* Default rounding_control class (does nothing) |
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*/ |
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template<class T> |
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struct rounding_control |
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{ |
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typedef int rounding_mode; |
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static void get_rounding_mode(rounding_mode&) {} |
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static void set_rounding_mode(rounding_mode) {} |
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static void upward() {} |
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static void downward() {} |
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static void to_nearest() {} |
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static const T& to_int(const T& x) { return x; } |
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static const T& force_rounding(const T& x) { return x; } |
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}; |
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/* |
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* A few rounding control classes (exact/std/opp: see documentation) |
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* rounded_arith_* control the rounding of the arithmetic operators |
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* rounded_transc_* control the rounding of the transcendental functions |
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*/ |
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template<class T, class Rounding = rounding_control<T> > |
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struct rounded_arith_exact; |
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template<class T, class Rounding = rounding_control<T> > |
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struct rounded_arith_std; |
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template<class T, class Rounding = rounding_control<T> > |
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struct rounded_arith_opp; |
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template<class T, class Rounding> |
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struct rounded_transc_dummy; |
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template<class T, class Rounding = rounded_arith_exact<T> > |
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struct rounded_transc_exact; |
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template<class T, class Rounding = rounded_arith_std<T> > |
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struct rounded_transc_std; |
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template<class T, class Rounding = rounded_arith_opp<T> > |
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struct rounded_transc_opp; |
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/* |
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* State-saving classes: allow to set and reset rounding control |
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*/ |
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namespace detail { |
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template<class Rounding> |
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struct save_state_unprotected: Rounding |
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{ |
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typedef save_state_unprotected<Rounding> unprotected_rounding; |
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}; |
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} // namespace detail |
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template<class Rounding> |
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struct save_state: Rounding |
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{ |
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typename Rounding::rounding_mode mode; |
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save_state() { |
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this->get_rounding_mode(mode); |
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this->init(); |
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} |
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~save_state() { this->set_rounding_mode(mode); } |
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typedef detail::save_state_unprotected<Rounding> unprotected_rounding; |
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}; |
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template<class Rounding> |
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struct save_state_nothing: Rounding |
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{ |
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typedef save_state_nothing<Rounding> unprotected_rounding; |
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}; |
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template<class T> |
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struct rounded_math: save_state_nothing<rounded_arith_exact<T> > |
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{}; |
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} // namespace interval_lib |
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} // namespace numeric |
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} // namespace boost |
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#endif // BOOST_NUMERIC_INTERVAL_ROUNDING_HPP
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