libstdc++-v3/testsuite/std/concepts/concepts.callable/relation.cc

   1 // Copyright (C) 2019-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target c++20 } }
  19
  20 #include <concepts>
  21
  22 static_assert( ! std::relation<bool, void, void> );
  23 static_assert( ! std::relation<bool(), void, void> );
  24 static_assert( ! std::relation<bool(*)(), void, void> );
  25 static_assert( ! std::relation<bool(&)(int, int), void, void> );
  26 static_assert( ! std::relation<bool(), int, int> );
  27 static_assert( ! std::relation<bool() const, int, int> );
  28
  29 static_assert( std::relation<bool(*)(int, int), short, long> );
  30 static_assert( std::relation<bool(&)(const void*, const void*), char[2], int*> );
  31
  32 static_assert( ! std::relation<bool& (const long*, short), long*, char> );
  33
  34 struct A;
  35 static_assert( ! std::relation<int A::*, const A&, const A&> );
  36 static_assert( ! std::relation<void (A::*)(long&), const A*, long&> );
  37 static_assert( ! std::relation<void (A::*)(long&) const, A*, long&> );
  38 static_assert( std::relation<long (A::*)(A*) const, A*, A*> );
  39
  40 struct F
  41 {
  42   void operator()(long, long) const;
  43   bool& operator()(int, const int&) const;
  44 };
  45 static_assert( ! std::relation<F, long, long> );
  46 static_assert( std::relation<F&, int, int> );
  47 static_assert( std::relation<const F&, const int, const int> );
  48
  49 // [concept.equiv]
  50 static_assert( std::equivalence_relation<bool(*)(int, int), short, long> );
  51 static_assert( ! std::equivalence_relation<F, long, long> );
  52 static_assert( std::equivalence_relation<const F&, const int, const int> );