63e88f80
 Hu Chunming
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/* Boost interval/policies.hpp template implementation file
*
* Copyright 2003 Guillaume Melquiond
*
* 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_POLICIES_HPP
#define BOOST_NUMERIC_INTERVAL_POLICIES_HPP
#include <boost/numeric/interval/interval.hpp>
namespace boost {
namespace numeric {
namespace interval_lib {
/*
* policies class
*/
template<class Rounding, class Checking>
struct policies
{
typedef Rounding rounding;
typedef Checking checking;
};
/*
* policies switching classes
*/
template<class OldInterval, class NewRounding>
class change_rounding
{
typedef typename OldInterval::base_type T;
typedef typename OldInterval::traits_type p;
typedef typename p::checking checking;
public:
typedef interval<T, policies<NewRounding, checking> > type;
};
template<class OldInterval, class NewChecking>
class change_checking
{
typedef typename OldInterval::base_type T;
typedef typename OldInterval::traits_type p;
typedef typename p::rounding rounding;
public:
typedef interval<T, policies<rounding, NewChecking> > type;
};
/*
* Protect / unprotect: control whether the rounding mode is set/reset
* at each operation, rather than once and for all.
*/
template<class OldInterval>
class unprotect
{
typedef typename OldInterval::base_type T;
typedef typename OldInterval::traits_type p;
typedef typename p::rounding r;
typedef typename r::unprotected_rounding newRounding;
public:
typedef typename change_rounding<OldInterval, newRounding>::type type;
};
} // namespace interval_lib
} // namespace numeric
} // namespace boost
#endif // BOOST_NUMERIC_INTERVAL_POLICIES_HPP
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