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