libstdc++-v3/testsuite/20_util/function_objects/range.cmp/not_equal_to.cc

   1 // Copyright (C) 2019-2023 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-options "-std=gnu++2a" }
  19 // { dg-do run { target c++2a } }
  20
  21 #include <functional>
  22 #include <testsuite_hooks.h>
  23
  24 // C++20 [range.cmp]
  25
  26 using F = std::ranges::not_equal_to;
  27 static_assert( std::is_default_constructible_v<F> );
  28 static_assert( std::is_copy_constructible_v<F> );
  29 static_assert( std::is_move_constructible_v<F> );
  30 static_assert( std::is_copy_assignable_v<F> );
  31 static_assert( std::is_move_assignable_v<F> );
  32
  33 static_assert( ! std::is_invocable_v<F> );
  34 static_assert( ! std::is_invocable_v<F, int&> );
  35 static_assert( ! std::is_invocable_v<F, int, void> );
  36 static_assert( ! std::is_invocable_v<F, int, void*> );
  37 static_assert( std::is_nothrow_invocable_r_v<bool, F&, int&, int> );
  38 static_assert( std::is_nothrow_invocable_r_v<bool, F, const long&, char> );
  39 static_assert( std::is_nothrow_invocable_r_v<bool, const F&, short, int&> );
  40 static_assert( std::is_nothrow_invocable_r_v<bool, const F, const char, char> );
  41
  42 using T = F::is_transparent; // required typedef
  43
  44 static_assert( ! std::ranges::not_equal_to{}(99, 99.0) );
  45 static_assert( std::ranges::not_equal_to{}(99, 99.01) );
  46 static_assert( std::ranges::not_equal_to{}(99, 140L) );
  47
  48 void
  49 test01()
  50 {
  51   F f;
  52   int a[2]{};
  53   VERIFY( ! f(&a, (void*)&a[0]) );
  54   VERIFY( f(&a, (void*)&a[1]) );
  55   VERIFY( ! f(&a + 1, (void*)(a + 2)) );
  56 }
  57
  58 struct X { };
  59 int operator==(X, X) noexcept { return 2; }
  60 int operator!=(X, X) { return 0; }
  61
  62 static_assert( std::is_nothrow_invocable_r_v<bool, F&, X, X> );
  63
  64 void
  65 test02()
  66 {
  67   X x;
  68   F f;
  69   VERIFY( ! f(x, x) );
  70 }
  71
  72 int
  73 main()
  74 {
  75   test01();
  76   test02();
  77 }