ceph/src/boost/libs/test/include/boost/test/tools/detail/tolerance_manip.hpp

   1 //  (C) Copyright Gennadiy Rozental 2001.
   2 //  Distributed under the Boost Software License, Version 1.0.
   3 //  (See accompanying file LICENSE_1_0.txt or copy at
   4 //  http://www.boost.org/LICENSE_1_0.txt)
   5
   6 //  See http://www.boost.org/libs/test for the library home page.
   7 //
   8 //! @file
   9 //! @brief Floating point comparison tolerance manipulators
  10 //!
  11 //! This file defines several manipulators for floating point comparison. These
  12 //! manipulators are intended to be used with BOOST_TEST.
  13 // ***************************************************************************
  14
  15 #ifndef BOOST_TEST_TOOLS_DETAIL_TOLERANCE_MANIP_HPP_012705GER
  16 #define BOOST_TEST_TOOLS_DETAIL_TOLERANCE_MANIP_HPP_012705GER
  17
  18 // Boost Test
  19 #include <boost/test/tools/detail/fwd.hpp>
  20 #include <boost/test/tools/detail/indirections.hpp>
  21
  22 #include <boost/test/tools/fpc_tolerance.hpp>
  23 #include <boost/test/tools/floating_point_comparison.hpp>
  24
  25 #include <boost/test/detail/suppress_warnings.hpp>
  26
  27 //____________________________________________________________________________//
  28
  29 namespace boost {
  30 namespace test_tools {
  31 namespace tt_detail {
  32
  33 // ************************************************************************** //
  34 // **************           fpc tolerance manipulator          ************** //
  35 // ************************************************************************** //
  36
  37 template<typename FPT>
  38 struct tolerance_manip {
  39     explicit tolerance_manip( FPT const & tol ) : m_value( tol ) {}
  40
  41     FPT m_value;
  42 };
  43
  44 //____________________________________________________________________________//
  45
  46 struct tolerance_manip_delay {};
  47
  48 template<typename FPT>
  49 inline tolerance_manip<FPT>
  50 operator%( FPT v, tolerance_manip_delay const& )
  51 {
  52     BOOST_STATIC_ASSERT_MSG( (fpc::tolerance_based<FPT>::value),
  53                              "tolerance should be specified using a floating points type" );
  54
  55     return tolerance_manip<FPT>( FPT(v / 100) );
  56 }
  57
  58 //____________________________________________________________________________//
  59
  60 template<typename E, typename FPT>
  61 inline assertion_result
  62 operator<<(assertion_evaluate_t<E> const& ae, tolerance_manip<FPT> const& tol)
  63 {
  64     local_fpc_tolerance<FPT> lt( tol.m_value );
  65
  66     return ae.m_e.evaluate();
  67 }
  68
  69 //____________________________________________________________________________//
  70
  71 template<typename FPT>
  72 inline int
  73 operator<<( unit_test::lazy_ostream const&, tolerance_manip<FPT> const& )   { return 0; }
  74
  75 //____________________________________________________________________________//
  76
  77 template<typename FPT>
  78 inline check_type
  79 operator<<( assertion_type const& /*at*/, tolerance_manip<FPT> const& )         { return CHECK_BUILT_ASSERTION; }
  80
  81 //____________________________________________________________________________//
  82
  83 } // namespace tt_detail
  84
  85
  86 /*! Tolerance manipulator
  87  *
  88  * These functions return a manipulator that can be used in conjunction with BOOST_TEST
  89  * in order to specify the tolerance with which floating point comparisons are made.
  90  */
  91 template<typename FPT>
  92 inline tt_detail::tolerance_manip<FPT>
  93 tolerance( FPT v )
  94 {
  95     BOOST_STATIC_ASSERT_MSG( (fpc::tolerance_based<FPT>::value),
  96                              "tolerance only for floating points" );
  97
  98     return tt_detail::tolerance_manip<FPT>( v );
  99 }
 100
 101 //____________________________________________________________________________//
 102
 103 //! @overload tolerance( FPT v )
 104 template<typename FPT>
 105 inline tt_detail::tolerance_manip<FPT>
 106 tolerance( fpc::percent_tolerance_t<FPT> v )
 107 {
 108     BOOST_STATIC_ASSERT_MSG( (fpc::tolerance_based<FPT>::value),
 109                              "tolerance only for floating points" );
 110
 111     return tt_detail::tolerance_manip<FPT>( static_cast<FPT>(v.m_value / 100) );
 112 }
 113
 114 //____________________________________________________________________________//
 115
 116 //! @overload tolerance( FPT v )
 117 inline tt_detail::tolerance_manip_delay
 118 tolerance()
 119 {
 120     return tt_detail::tolerance_manip_delay();
 121 }
 122
 123 //____________________________________________________________________________//
 124
 125 } // namespace test_tools
 126 } // namespace boost
 127
 128 #include <boost/test/detail/enable_warnings.hpp>
 129
 130 #endif // BOOST_TEST_TOOLS_DETAIL_TOLERANCE_MANIP_HPP_012705GER