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rounding.hpp
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/* 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 BOOST_NUMERIC_INTERVAL_ROUNDING_HPP #define BOOST_NUMERIC_INTERVAL_ROUNDING_HPP namespace 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 boost #endif // BOOST_NUMERIC_INTERVAL_ROUNDING_HPP