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

   1 // Copyright (C) 2019-2020 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 compile { target c++2a } }
  20
  21 #include <memory>
  22
  23 template<typename Alloc>
  24   concept has_pointer = requires { typename Alloc::pointer; };
  25
  26 template<typename Alloc>
  27   concept has_const_pointer = requires { typename Alloc::const_pointer; };
  28
  29 template<typename Alloc>
  30   concept has_reference = requires { typename Alloc::reference; };
  31
  32 template<typename Alloc>
  33   concept has_const_reference = requires { typename Alloc::const_reference; };
  34
  35 template<typename Alloc>
  36   concept has_rebind = requires { typename Alloc::template rebind<long>; };
  37
  38 template<typename Alloc>
  39   concept has_construct = requires(Alloc& a, int* p) { a.construct(p); };
  40
  41 template<typename Alloc>
  42   concept has_destroy = requires(Alloc& a, int* p) { a.destroy(p); };
  43
  44 template<typename Alloc>
  45   concept has_max_size = requires(Alloc& a) { a.max_size(); };
  46
  47 using A = std::allocator<int>;
  48
  49 static_assert( !has_pointer<A> );
  50 static_assert( !has_const_pointer<A> );
  51 static_assert( !has_reference<A> );
  52 static_assert( !has_const_reference<A> );
  53 static_assert( !has_rebind<A> );
  54 static_assert( !has_construct<A> );
  55 static_assert( !has_destroy<A> );
  56 static_assert( !has_max_size<A> );
  57
  58 using V = std::allocator<void>;
  59
  60 static_assert( !has_pointer<V> );
  61 static_assert( !has_const_pointer<V> );
  62 static_assert( !has_reference<V> );
  63 static_assert( !has_const_reference<V> );
  64 static_assert( !has_rebind<V> );
  65 static_assert( !has_construct<V> );
  66 static_assert( !has_destroy<V> );
  67 static_assert( !has_max_size<V> );