ceph/src/boost/libs/core/test/scoped_enum.cpp

   1 /*
   2  *             Copyright Andrey Semashev 2014.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   scoped_enum.cpp
   9  * \author Andrey Semashev
  10  * \date   06.06.2014
  11  *
  12  * \brief  This test checks that scoped enum emulation works similar to C++11 scoped enums.
  13  */
  14
  15 #include <boost/core/scoped_enum.hpp>
  16 #include <boost/core/lightweight_test.hpp>
  17
  18 BOOST_SCOPED_ENUM_DECLARE_BEGIN(namespace_enum1)
  19 {
  20     value0,
  21     value1,
  22     value2
  23 }
  24 BOOST_SCOPED_ENUM_DECLARE_END(namespace_enum1)
  25
  26 BOOST_SCOPED_ENUM_UT_DECLARE_BEGIN(namespace_enum2, unsigned char)
  27 {
  28     // Checks that enum value names do not clash
  29     value0 = 10,
  30     value1 = 20,
  31     value2 = 30
  32 }
  33 BOOST_SCOPED_ENUM_DECLARE_END(namespace_enum2)
  34
  35 struct my_struct
  36 {
  37     // Checks that declarations are valid in class scope
  38     BOOST_SCOPED_ENUM_DECLARE_BEGIN(color)
  39     {
  40         red,
  41         green,
  42         blue
  43     }
  44     BOOST_SCOPED_ENUM_DECLARE_END(color)
  45
  46     color m_color;
  47
  48     explicit my_struct(color col) : m_color(col)
  49     {
  50     }
  51
  52     color get_color() const
  53     {
  54         return m_color;
  55     }
  56 };
  57
  58 void check_operators()
  59 {
  60     namespace_enum1 enum1 = namespace_enum1::value0;
  61     BOOST_TEST(enum1 == namespace_enum1::value0);
  62     BOOST_TEST(enum1 != namespace_enum1::value1);
  63     BOOST_TEST(enum1 != namespace_enum1::value2);
  64
  65     enum1 = namespace_enum1::value1;
  66     BOOST_TEST(enum1 != namespace_enum1::value0);
  67     BOOST_TEST(enum1 == namespace_enum1::value1);
  68     BOOST_TEST(enum1 != namespace_enum1::value2);
  69
  70     BOOST_TEST(!(enum1 < namespace_enum1::value0));
  71     BOOST_TEST(!(enum1 <= namespace_enum1::value0));
  72     BOOST_TEST(enum1 >= namespace_enum1::value0);
  73     BOOST_TEST(enum1 > namespace_enum1::value0);
  74
  75     BOOST_TEST(!(enum1 < namespace_enum1::value1));
  76     BOOST_TEST(enum1 <= namespace_enum1::value1);
  77     BOOST_TEST(enum1 >= namespace_enum1::value1);
  78     BOOST_TEST(!(enum1 > namespace_enum1::value1));
  79
  80     namespace_enum1 enum2 = namespace_enum1::value0;
  81     BOOST_TEST(enum1 != enum2);
  82
  83     enum2 = enum1;
  84     BOOST_TEST(enum1 == enum2);
  85 }
  86
  87 void check_argument_passing()
  88 {
  89     my_struct str(my_struct::color::green);
  90     BOOST_TEST(str.get_color() == my_struct::color::green);
  91 }
  92
  93 void check_switch_case()
  94 {
  95     my_struct str(my_struct::color::blue);
  96
  97     switch (boost::native_value(str.get_color()))
  98     {
  99     case my_struct::color::blue:
 100         break;
 101     default:
 102         BOOST_ERROR("Unexpected color value in switch/case");
 103     }
 104 }
 105
 106 template< typename T >
 107 struct my_trait
 108 {
 109     enum _ { value = 0 };
 110 };
 111
 112 template< >
 113 struct my_trait< BOOST_SCOPED_ENUM_NATIVE(namespace_enum2) >
 114 {
 115     enum _ { value = 1 };
 116 };
 117
 118 template< typename T >
 119 void native_type_helper(T)
 120 {
 121     BOOST_TEST(my_trait< T >::value != 0);
 122 }
 123
 124 void check_native_type()
 125 {
 126     BOOST_TEST(my_trait< int >::value == 0);
 127     BOOST_TEST(my_trait< BOOST_SCOPED_ENUM_NATIVE(namespace_enum2) >::value != 0);
 128     BOOST_TEST(my_trait< boost::native_type< namespace_enum2 >::type >::value != 0);
 129
 130     namespace_enum2 enum1 = namespace_enum2::value0;
 131     native_type_helper(boost::native_value(enum1));
 132 }
 133
 134 void check_underlying_cast()
 135 {
 136     namespace_enum2 enum1 = namespace_enum2::value1;
 137     BOOST_TEST(boost::underlying_cast< unsigned char >(enum1) == 20);
 138 }
 139
 140 void check_underlying_type()
 141 {
 142     // The real check for the type is in the underlying_type trait test.
 143     namespace_enum2 enum1 = namespace_enum2::value1;
 144     BOOST_TEST(sizeof(enum1) == sizeof(unsigned char));
 145 }
 146
 147 int main(int, char*[])
 148 {
 149     check_operators();
 150     check_argument_passing();
 151     check_switch_case();
 152     check_native_type();
 153     check_underlying_cast();
 154     check_underlying_type();
 155
 156     return boost::report_errors();
 157 }