ceph/src/boost/libs/convert/test/sfinae.cpp

   1 // Boost.Convert test and usage example
   2 // Copyright (c) 2009-2016 Vladimir Batov.
   3 // Use, modification and distribution are subject to the Boost Software License,
   4 // Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
   5
   6 #include "./test.hpp"
   7
   8 #if defined(BOOST_CONVERT_IS_NOT_SUPPORTED)
   9 int main(int, char const* []) { return 0; }
  10 #else
  11
  12 #include <boost/convert.hpp>
  13 #include <boost/convert/detail/is_string.hpp>
  14 #include <boost/convert/detail/is_callable.hpp>
  15 #include <boost/detail/lightweight_test.hpp>
  16
  17 //[is_callable_declaration
  18 namespace { namespace local
  19 {
  20     BOOST_DECLARE_IS_CALLABLE(can_call_funop, operator());
  21     BOOST_DECLARE_IS_CALLABLE(can_call_func, func);
  22 }}
  23 //]
  24
  25 //[is_callable_classes_tested
  26 namespace { namespace callable
  27 {
  28     struct  test1 { int  operator()(double, std::string) { return 0; }};
  29     struct  test2 { void operator()(double, std::string) {}};
  30     struct  test3 { void operator()(int) {}};
  31     struct  test4 { std::string operator()(int) const { return std::string(); }};
  32     struct  test5 { std::string operator()(int, std::string const& =std::string()) const { return std::string(); }};
  33     struct  test6 { template<typename T> std::string operator()(T) const { return std::string(); }};
  34     struct  test7 { template<typename T> T operator()(T) const  { return T(); }};
  35
  36     struct  test11 { int  func(double, std::string) { return 0; }};
  37     struct  test12 { void func(double, std::string) {}};
  38     struct  test13 { void func(int) {}};
  39     struct  test14 { std::string func(int) const { return std::string(); }};
  40     struct  test15 { std::string func(int, std::string const& =std::string()) const { return std::string(); }};
  41     struct  test16 { template<typename T> std::string func(T) const { return std::string(); }};
  42     struct  test17 { template<typename T> T func(T) const { return T(); }};
  43 }}
  44 //]
  45
  46 static
  47 void
  48 test_is_callable()
  49 {
  50     // C1. Unfortunately, passing 'double' where 'int' is expected returns 'true'.
  51     //     The same as the following (which successfully compiles):
  52     //          void fun(int) {}
  53     //          fun(double(1));
  54
  55     //[is_callable_usage1
  56     BOOST_TEST((local::can_call_funop<callable::test1, int (double, std::string)>::value == true));
  57     BOOST_TEST((local::can_call_funop<callable::test1, double (int, std::string)>::value == true));
  58     BOOST_TEST((local::can_call_funop<callable::test1, void (double, std::string)>::value == true));
  59     BOOST_TEST((local::can_call_funop<callable::test1, void (int, std::string)>::value == true));
  60     BOOST_TEST((local::can_call_funop<callable::test1, void (int, char const*)>::value == true));
  61     BOOST_TEST((local::can_call_funop<callable::test1, int (double, int)>::value == false));
  62     BOOST_TEST((local::can_call_funop<callable::test1, int (double)>::value == false));
  63
  64     BOOST_TEST((local::can_call_funop<callable::test2, int  (double, std::string)>::value == false));
  65     BOOST_TEST((local::can_call_funop<callable::test2, void (double, std::string)>::value == true));
  66     BOOST_TEST((local::can_call_funop<callable::test2, void (   int, std::string)>::value == true));
  67     BOOST_TEST((local::can_call_funop<callable::test2, void (   int, char const*)>::value == true));
  68     //]
  69     BOOST_TEST((local::can_call_funop<callable::test3,       void (double)>::value == true)); //C1
  70     BOOST_TEST((local::can_call_funop<callable::test3,       void (int)>::value == true));
  71     BOOST_TEST((local::can_call_funop<callable::test3 const, void (int)>::value == false));
  72
  73     BOOST_TEST((local::can_call_funop<callable::test4 const, std::string (int)>::value == true));
  74     BOOST_TEST((local::can_call_funop<callable::test4,       std::string (int)>::value == true));
  75     BOOST_TEST((local::can_call_funop<callable::test4 const, void (int)>::value == true));
  76     BOOST_TEST((local::can_call_funop<callable::test4,       void (int)>::value == true));
  77
  78     BOOST_TEST((local::can_call_funop<callable::test5, std::string (int, std::string)>::value == true));
  79     BOOST_TEST((local::can_call_funop<callable::test5, std::string (int, std::string const&)>::value == true));
  80     BOOST_TEST((local::can_call_funop<callable::test5, void        (int, char const*)>::value == true));
  81     BOOST_TEST((local::can_call_funop<callable::test5,       std::string (int)>::value == true));
  82     BOOST_TEST((local::can_call_funop<callable::test5 const, std::string (int)>::value == true));
  83     BOOST_TEST((local::can_call_funop<callable::test5,       void (int)>::value == true));
  84     BOOST_TEST((local::can_call_funop<callable::test5 const, void (int)>::value == true));
  85     BOOST_TEST((local::can_call_funop<callable::test5,       void (char const*)>::value == false));
  86     BOOST_TEST((local::can_call_funop<callable::test5 const, void (char const*)>::value == false));
  87
  88     BOOST_TEST((local::can_call_funop<callable::test6, std::string (int)>::value == true));
  89     BOOST_TEST((local::can_call_funop<callable::test6, std::string (std::string)>::value == true));
  90     BOOST_TEST((local::can_call_funop<callable::test6, void        (int)>::value == true));
  91     BOOST_TEST((local::can_call_funop<callable::test6, void        (std::string)>::value == true));
  92
  93     BOOST_TEST((local::can_call_funop<callable::test7, std::string (int)>::value == false));
  94     BOOST_TEST((local::can_call_funop<callable::test7, std::string (std::string)>::value == true));
  95     BOOST_TEST((local::can_call_funop<callable::test7, void        (int)>::value == true));
  96     BOOST_TEST((local::can_call_funop<callable::test7, void        (std::string)>::value == true));
  97
  98     //[is_callable_usage2
  99     BOOST_TEST((local::can_call_func<callable::test11, int (double, std::string)>::value == true));
 100     BOOST_TEST((local::can_call_func<callable::test11, double (int, std::string)>::value == true));
 101     BOOST_TEST((local::can_call_func<callable::test11, void (double, std::string)>::value == true));
 102     BOOST_TEST((local::can_call_func<callable::test11, void (int, std::string)>::value == true));
 103     BOOST_TEST((local::can_call_func<callable::test11, void (int, char const*)>::value == true));
 104     BOOST_TEST((local::can_call_func<callable::test11, int (double, int)>::value == false));
 105     BOOST_TEST((local::can_call_func<callable::test11, int (double)>::value == false));
 106
 107     BOOST_TEST((local::can_call_func<callable::test12, int  (double, std::string)>::value == false));
 108     BOOST_TEST((local::can_call_func<callable::test12, void (double, std::string)>::value == true));
 109     BOOST_TEST((local::can_call_func<callable::test12, void (   int, std::string)>::value == true));
 110     BOOST_TEST((local::can_call_func<callable::test12, void (   int, char const*)>::value == true));
 111     //]
 112     BOOST_TEST((local::can_call_func<callable::test13,       void (double)>::value == true)); //C1
 113     BOOST_TEST((local::can_call_func<callable::test13,       void (int)>::value == true));
 114     BOOST_TEST((local::can_call_func<callable::test13 const, void (int)>::value == false));
 115
 116     BOOST_TEST((local::can_call_func<callable::test14 const, std::string (int)>::value == true));
 117     BOOST_TEST((local::can_call_func<callable::test14,       std::string (int)>::value == true));
 118     BOOST_TEST((local::can_call_func<callable::test14 const, void (int)>::value == true));
 119     BOOST_TEST((local::can_call_func<callable::test14,       void (int)>::value == true));
 120
 121     BOOST_TEST((local::can_call_func<callable::test15, std::string (int, std::string)>::value == true));
 122     BOOST_TEST((local::can_call_func<callable::test15, std::string (int, std::string const&)>::value == true));
 123     BOOST_TEST((local::can_call_func<callable::test15, void        (int, char const*)>::value == true));
 124     BOOST_TEST((local::can_call_func<callable::test15,       std::string (int)>::value == true));
 125     BOOST_TEST((local::can_call_func<callable::test15 const, std::string (int)>::value == true));
 126     BOOST_TEST((local::can_call_func<callable::test15,       void (int)>::value == true));
 127     BOOST_TEST((local::can_call_func<callable::test15 const, void (int)>::value == true));
 128     BOOST_TEST((local::can_call_func<callable::test15,       void (char const*)>::value == false));
 129     BOOST_TEST((local::can_call_func<callable::test15 const, void (char const*)>::value == false));
 130
 131     BOOST_TEST((local::can_call_func<callable::test16, std::string (int)>::value == true));
 132     BOOST_TEST((local::can_call_func<callable::test16, std::string (std::string)>::value == true));
 133     BOOST_TEST((local::can_call_func<callable::test16, void        (int)>::value == true));
 134     BOOST_TEST((local::can_call_func<callable::test16, void        (std::string)>::value == true));
 135
 136     BOOST_TEST((local::can_call_func<callable::test17, std::string (int)>::value == false));
 137     BOOST_TEST((local::can_call_func<callable::test17, std::string (std::string)>::value == true));
 138     BOOST_TEST((local::can_call_func<callable::test17, void        (int)>::value == true));
 139     BOOST_TEST((local::can_call_func<callable::test17, void        (std::string)>::value == true));
 140 }
 141
 142 int
 143 main(int, char const* [])
 144 {
 145     //[is_callable_usage
 146     //]
 147
 148     test_is_callable();
 149
 150     BOOST_TEST(boost::cnv::is_string<direction>::value == false);
 151     BOOST_TEST(boost::cnv::is_string<std::string>::value == true);
 152     BOOST_TEST(boost::cnv::is_string<std::wstring>::value == true);
 153     BOOST_TEST(boost::cnv::is_string<my_string>::value == true);
 154     BOOST_TEST(boost::cnv::is_string<int>::value == false);
 155
 156     return boost::report_errors();
 157 }
 158
 159 #endif