libstdc++-v3/testsuite/20_util/is_swappable_with/value.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile { target c++17 } }
   3
   4 // Copyright (C) 2016-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <type_traits>
  22 #include <testsuite_tr1.h>
  23
  24 #ifndef __cpp_lib_is_swappable
  25 # error "Feature-test macro for is_swappable_with missing"
  26 #elif __cpp_lib_is_swappable != 201603
  27 # error "Feature-test macro for is_swappable_with has wrong value"
  28 #endif
  29
  30 namespace funny {
  31   struct T0 {};
  32
  33   void swap(T0, T0);
  34
  35   struct T1 {};
  36   struct T2 {};
  37
  38   void swap(T1, T2);
  39   void swap(T2, T1);
  40
  41   struct BoolLike {};
  42
  43   void swap(BoolLike, bool&);
  44   void swap(bool&, BoolLike);
  45
  46   struct F0 {};
  47
  48   void swap(F0, F0) = delete;
  49
  50   struct F1 {};
  51
  52   void swap(F0, F1) = delete;
  53   void swap(F1, F0) = delete;
  54
  55   struct F2 {};
  56   struct F3 {};
  57
  58   void swap(F2, F3);
  59   void swap(F3, F2) = delete;
  60
  61   struct F4
  62   {
  63     friend void swap(F4, F4) = delete;
  64   };
  65 }
  66
  67 void test01()
  68 {
  69   using std::is_swappable_with;
  70   using namespace __gnu_test;
  71   // Positive tests.
  72   static_assert(test_property<is_swappable_with, int&, int&>(true), "");
  73   static_assert(test_property<is_swappable_with, funny::T0,
  74     funny::T0>(true), "");
  75   static_assert(test_property<is_swappable_with, funny::T0,
  76     const funny::T0>(true), "");
  77   static_assert(test_property<is_swappable_with, funny::T1,
  78     funny::T2>(true), "");
  79   static_assert(test_property<is_swappable_with, funny::T2,
  80     funny::T1>(true), "");
  81   static_assert(test_property<is_swappable_with, funny::BoolLike,
  82     bool&>(true), "");
  83   static_assert(test_property<is_swappable_with, const funny::BoolLike,
  84     bool&>(true), "");
  85
  86   // Negative tests.
  87   static_assert(test_property<is_swappable_with, int, int>(false), "");
  88   static_assert(test_property<is_swappable_with, int&, unsigned&>(false), "");
  89   static_assert(test_property<is_swappable_with, const int&,
  90     const int&>(false), "");
  91   static_assert(test_property<is_swappable_with, funny::F0,
  92     funny::F0>(false), "");
  93   static_assert(test_property<is_swappable_with, funny::F0,
  94     const funny::F0>(false), "");
  95   static_assert(test_property<is_swappable_with, funny::T0,
  96     funny::T1>(false), "");
  97   static_assert(test_property<is_swappable_with, funny::F0,
  98     funny::F1>(false), "");
  99   static_assert(test_property<is_swappable_with, funny::F0,
 100     const funny::F1>(false), "");
 101   static_assert(test_property<is_swappable_with, const funny::F0,
 102     funny::F1>(false), "");
 103   static_assert(test_property<is_swappable_with, funny::F2,
 104     funny::F3>(false), "");
 105   static_assert(test_property<is_swappable_with, funny::F2,
 106     const funny::F3>(false), "");
 107   static_assert(test_property<is_swappable_with, const funny::F2,
 108     funny::F3>(false), "");
 109   static_assert(test_property<is_swappable_with, funny::F4,
 110     funny::F4>(false), "");
 111   static_assert(test_property<is_swappable_with, funny::BoolLike,
 112     funny::BoolLike>(false), "");
 113 }