libstdc++-v3/testsuite/20_util/allocator/requirements/typedefs.cc

   1 // { dg-do compile { target c++11 } }
   2 // { dg-require-effective-target hosted }
   3
   4 // Copyright (C) 2012-2024 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
  18 // along with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21
  22 #include <memory>
  23 #include <type_traits>
  24
  25 // Check std::allocator for required typedefs.
  26
  27 using std::is_same;
  28 using std::allocator;
  29
  30 static_assert( is_same<allocator<int>::size_type, std::size_t>::value,
  31                "size_type" );
  32 static_assert( is_same<allocator<int>::difference_type, std::ptrdiff_t>::value,
  33                "difference_type" );
  34 #if __cplusplus <= 201703L
  35 static_assert( is_same<allocator<int>::pointer, int*>::value,
  36                "pointer" );
  37 static_assert( is_same<allocator<int>::const_pointer, const int*>::value,
  38                "const_pointer" );
  39 static_assert( is_same<allocator<int>::reference, int&>::value,
  40                "reference" );
  41 static_assert( is_same<allocator<int>::const_reference, const int&>::value,
  42                "const_reference" );
  43 #endif
  44 static_assert( is_same<allocator<int>::value_type, int>::value,
  45                "value_type" );
  46
  47 #if __cplusplus <= 201703L
  48 static_assert( is_same<allocator<int>::rebind<char>::other,
  49                        allocator<char>>::value,
  50                "rebind::other" );
  51 #endif
  52
  53 static_assert( is_same<allocator<int>::propagate_on_container_move_assignment,
  54                        std::true_type>::value,
  55                "propagate_on_container_move_assignment" );
  56
  57 using IAE = allocator<int>::is_always_equal; // { dg-warning "deprecated" "" { target c++20 } }
  58 static_assert( is_same<IAE, std::true_type>::value, "is_always_equal" );
  59
  60
  61 // Test required typedefs for allocator<void> specialization.
  62 static_assert( is_same<allocator<void>::value_type, void>::value,
  63                "void value_type" );
  64 #if __cplusplus <= 201703L
  65 static_assert( is_same<allocator<void>::pointer, void*>::value,
  66                "void pointer" );
  67 static_assert( is_same<allocator<void>::const_pointer, const void*>::value,
  68                "void const_pointer" );
  69 static_assert( is_same<allocator<void>::rebind<char>::other,
  70                        allocator<char>>::value,
  71                "void rebind::other" );
  72 #else
  73 // Since C++20 allocator<void> uses the primary template, so has the same types.
  74 static_assert( is_same<allocator<void>::propagate_on_container_move_assignment,
  75                        std::true_type>::value,
  76                "propagate_on_container_move_assignment" );
  77
  78 using VIAE = allocator<void>::is_always_equal; // { dg-warning "deprecated" "" { target c++20 } }
  79 static_assert( is_same<VIAE, std::true_type>::value, "is_always_equal" );
  80 #endif