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