102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
/* 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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