libstdc++-v3/testsuite/20_util/allocator_traits/members/max_size.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2011-2023 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <memory>
  21 #include <limits>
  22 #include <type_traits>
  23 #include <testsuite_hooks.h>
  24
  25 struct X { };
  26
  27 template<typename T>
  28 struct maxsize_allocator
  29 {
  30   typedef T value_type;
  31   typedef unsigned size_type;
  32
  33   size_type max_size() const { return 100; }
  34 };
  35
  36 template<typename T>
  37 struct unsized_allocator
  38 {
  39   typedef T value_type;
  40 };
  41
  42
  43 void test01()
  44 {
  45   typedef std::allocator_traits<maxsize_allocator<X>> traits_type;
  46   traits_type::allocator_type a;
  47   auto size = a.max_size();
  48   VERIFY( traits_type::max_size(a) == size );
  49 }
  50
  51 void test02()
  52 {
  53   typedef std::allocator_traits<unsized_allocator<X>> traits_type;
  54   traits_type::allocator_type a;
  55   auto size = std::numeric_limits<traits_type::size_type>::max();
  56   VERIFY( traits_type::max_size(a) == size / sizeof(X) );
  57 }
  58
  59 void test03()
  60 {
  61   typedef std::allocator_traits<unsized_allocator<int>> traits_type;
  62   traits_type::allocator_type a;
  63   auto size = std::numeric_limits<traits_type::size_type>::max();
  64   VERIFY( traits_type::max_size(a) == size / sizeof(int) );
  65 }
  66
  67 int main()
  68 {
  69   test01();
  70   test02();
  71   test03();
  72 }