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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102/* Boost interval/rounding.hpp template implementation file * * Copyright 2002-2003 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion * * Distributed under the Boost Software License, Version 1.0. * (See accompanying file LICENSE_1_0.txt or * copy at http://www.boost.org/LICENSE_1_0.txt) */
#ifndef GECODE_BOOST_NUMERIC_INTERVAL_ROUNDING_HPP#define GECODE_BOOST_NUMERIC_INTERVAL_ROUNDING_HPP
namespace gecode_boost {namespace numeric {namespace interval_lib {
/* * Default rounding_control class (does nothing) */
template<class T>struct rounding_control{ typedef int rounding_mode; static void get_rounding_mode(rounding_mode&) {} static void set_rounding_mode(rounding_mode) {} static void upward() {} static void downward() {} static void to_nearest() {} static const T& to_int(const T& x) { return x; } static const T& force_rounding(const T& x) { return x; }};
/* * A few rounding control classes (exact/std/opp: see documentation) * rounded_arith_* control the rounding of the arithmetic operators * rounded_transc_* control the rounding of the transcendental functions */
template<class T, class Rounding = rounding_control<T> >struct rounded_arith_exact;
template<class T, class Rounding = rounding_control<T> >struct rounded_arith_std;
template<class T, class Rounding = rounding_control<T> >struct rounded_arith_opp;
template<class T, class Rounding>struct rounded_transc_dummy;
template<class T, class Rounding = rounded_arith_exact<T> > struct rounded_transc_exact;
template<class T, class Rounding = rounded_arith_std<T> > struct rounded_transc_std;
template<class T, class Rounding = rounded_arith_opp<T> > struct rounded_transc_opp;
/* * State-saving classes: allow to set and reset rounding control */
namespace detail {
template<class Rounding>struct save_state_unprotected: Rounding{ typedef save_state_unprotected<Rounding> unprotected_rounding;};
} // namespace detail
template<class Rounding>struct save_state: Rounding{ typename Rounding::rounding_mode mode; save_state() { this->get_rounding_mode(mode); this->init(); } ~save_state() { this->set_rounding_mode(mode); } typedef detail::save_state_unprotected<Rounding> unprotected_rounding;}; template<class Rounding>struct save_state_nothing: Rounding{ typedef save_state_nothing<Rounding> unprotected_rounding;}; template<class T>struct rounded_math: save_state_nothing<rounded_arith_exact<T> >{};
} // namespace interval_lib} // namespace numeric} // namespace gecode_boost
#endif // GECODE_BOOST_NUMERIC_INTERVAL_ROUNDING_HPP