// (C) Copyright Gennadiy Rozental 2001.
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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 copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/test for the library home page.
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//
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//! @file
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//! @brief Floating point comparison tolerance manipulators
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//!
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//! This file defines several manipulators for floating point comparison. These
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//! manipulators are intended to be used with BOOST_TEST.
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// ***************************************************************************
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#ifndef BOOST_TEST_TOOLS_DETAIL_TOLERANCE_MANIP_HPP_012705GER
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#define BOOST_TEST_TOOLS_DETAIL_TOLERANCE_MANIP_HPP_012705GER
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// Boost Test
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#include <boost/test/tools/detail/fwd.hpp>
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#include <boost/test/tools/detail/indirections.hpp>
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#include <boost/test/utils/lazy_ostream.hpp>
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#include <boost/test/tools/fpc_tolerance.hpp>
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#include <boost/test/tools/floating_point_comparison.hpp>
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#include <ostream>
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#include <boost/test/detail/suppress_warnings.hpp>
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//____________________________________________________________________________//
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namespace boost {
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namespace test_tools {
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namespace tt_detail {
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// ************************************************************************** //
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// ************** fpc tolerance manipulator ************** //
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// ************************************************************************** //
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//! Tolerance manipulator, not to be used directly
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//! This is not a terminal of the expression
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template<typename FPT>
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struct tolerance_manip {
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explicit tolerance_manip( FPT const & tol ) : m_value( tol ) {}
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FPT m_value;
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};
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//____________________________________________________________________________//
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struct tolerance_manip_delay {};
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template<typename FPT>
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inline tolerance_manip<FPT>
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operator%( FPT v, tolerance_manip_delay const& )
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{
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BOOST_STATIC_ASSERT_MSG( (fpc::tolerance_based<FPT>::value),
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"tolerance should be specified using a floating points type" );
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return tolerance_manip<FPT>( FPT(v / 100) );
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}
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template <typename FPT>
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struct tolerance_evaluation_context: assertion_evaluation_context {
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tolerance_evaluation_context(FPT tol)
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: assertion_evaluation_context( true ) // has report
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, m_tolerance_context(tol)
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{}
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local_fpc_tolerance<FPT> m_tolerance_context;
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};
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//____________________________________________________________________________//
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template<typename E, typename FPT>
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inline assertion_evaluate_t<E>
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operator<<(assertion_evaluate_t<E> const& ae, tolerance_manip<FPT> const& tol)
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{
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return ae.stack_context(
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typename assertion_evaluate_t<E>::context_holder(
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new tolerance_evaluation_context<FPT>( tol.m_value ))
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);
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}
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//____________________________________________________________________________//
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template<typename FPT>
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unit_test::lazy_ostream &
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operator<<( unit_test::lazy_ostream &o, tolerance_manip<FPT> const& ) { return o; }
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// needed for the lazy evaluation in lazy_ostream as for commutativity with other arguments
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template<typename FPT>
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std::ostream&
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operator<<( std::ostream& o, tolerance_manip<FPT> const& ) { return o; }
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//____________________________________________________________________________//
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template<typename FPT>
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inline assertion_type
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operator<<( assertion_type const& /*at*/, tolerance_manip<FPT> const& ) {
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return assertion_type(CHECK_BUILT_ASSERTION);
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}
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//____________________________________________________________________________//
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} // namespace tt_detail
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/*! Tolerance manipulator
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*
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* These functions return a manipulator that can be used in conjunction with BOOST_TEST
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* in order to specify the tolerance with which floating point comparisons are made.
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*/
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template<typename FPT>
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inline tt_detail::tolerance_manip<FPT>
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tolerance( FPT v )
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{
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BOOST_STATIC_ASSERT_MSG( (fpc::tolerance_based<FPT>::value),
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"tolerance only for floating points" );
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return tt_detail::tolerance_manip<FPT>( v );
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}
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//____________________________________________________________________________//
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//! @overload tolerance( FPT v )
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template<typename FPT>
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inline tt_detail::tolerance_manip<FPT>
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tolerance( fpc::percent_tolerance_t<FPT> v )
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{
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BOOST_STATIC_ASSERT_MSG( (fpc::tolerance_based<FPT>::value),
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"tolerance only for floating points" );
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return tt_detail::tolerance_manip<FPT>( static_cast<FPT>(v.m_value / 100) );
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}
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//____________________________________________________________________________//
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//! @overload tolerance( FPT v )
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inline tt_detail::tolerance_manip_delay
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tolerance()
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{
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return tt_detail::tolerance_manip_delay();
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}
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//____________________________________________________________________________//
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} // namespace test_tools
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} // namespace boost
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#include <boost/test/detail/enable_warnings.hpp>
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#endif // BOOST_TEST_TOOLS_DETAIL_TOLERANCE_MANIP_HPP_012705GER
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