libstdc++-v3/testsuite/23_containers/queue/requirements/uses_allocator.cc

   1 // Copyright (C) 2014-2025 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++11 } }
  19
  20 #include <queue>
  21
  22 using test_type = std::queue<int>;
  23 using container = test_type::container_type;
  24
  25 template<typename A>
  26   using uses_allocator = std::uses_allocator<test_type, A>;
  27
  28 template<typename... Args>
  29   using is_constructible = std::is_constructible<test_type, Args...>;
  30
  31 // test with valid allocator
  32 using alloc_type = container::allocator_type;
  33
  34 static_assert( uses_allocator<alloc_type>::value, "valid allocator" );
  35
  36 static_assert( is_constructible<const alloc_type&>::value,
  37                "queue(const Alloc&)" );
  38 static_assert( is_constructible<const container&, const alloc_type&>::value,
  39                "queue(const container_type&, const Alloc&)" );
  40 static_assert( is_constructible<container&&, const alloc_type&>::value,
  41                "queue(const container_type&, const Alloc&)" );
  42 static_assert( is_constructible<const test_type&, const alloc_type&>::value,
  43                "queue(const queue&, const Alloc&)" );
  44 static_assert( is_constructible<test_type&&, const alloc_type&>::value,
  45                "queue(const queue&, const Alloc&)" );
  46
  47 // test with invalid allocator
  48 struct X { };
  49
  50 static_assert( !uses_allocator<X>::value, "invalid allocator" );
  51
  52 static_assert( !is_constructible<const X&>::value,
  53                "queue(const NonAlloc&)" );
  54 static_assert( !is_constructible<const container&, const X&>::value,
  55                "queue(const container_type&, const NonAlloc&)" );
  56 static_assert( !is_constructible<container&&, const X&>::value,
  57                "queue(const container_type&, const NonAlloc&)" );
  58 static_assert( !is_constructible<const test_type&, const X&>::value,
  59                "queue(const queue&, const NonAlloc&)" );
  60 static_assert( !is_constructible<test_type&&, const X&>::value,
  61                "queue(const queue&, const NonAlloc&)" );