/* 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 |