libstdc++-v3/testsuite/20_util/polymorphic_allocator/allocate_object.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-do run { target c++20 } }
  19
  20 #include <memory_resource>
  21 #include <cstring>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_allocator.h>
  24
  25 void
  26 test01()
  27 {
  28   __gnu_test::memory_resource res;
  29   std::pmr::polymorphic_allocator<> alloc(&res);
  30   static_assert( std::is_same_v<decltype(alloc)::value_type, std::byte> );
  31
  32   void* p = alloc.allocate_bytes(100);
  33   VERIFY( res.number_of_active_allocations() == 1 );
  34   alloc.deallocate_bytes(p, 100);
  35   VERIFY( res.number_of_active_allocations() == 0 );
  36   p = alloc.allocate_bytes(100, 64);
  37   VERIFY( res.number_of_active_allocations() == 1 );
  38   alloc.deallocate_bytes(p, 100, 64);
  39   VERIFY( res.number_of_active_allocations() == 0 );
  40
  41   int* p1 = alloc.allocate_object<int>();
  42   int* p2 = alloc.allocate_object<int>(2);
  43   struct X { double d[10]; };
  44   X* px = alloc.allocate_object<X>(20);
  45   VERIFY( res.number_of_active_allocations() == 3 );
  46
  47   alloc.deallocate_object(p1);
  48   alloc.deallocate_object(p2, 2);
  49   alloc.deallocate_object(px, 20);
  50   VERIFY( res.number_of_active_allocations() == 0 );
  51
  52   struct Y {
  53     Y(int i, const char* s, bool* alive)
  54     : i(i), s(s), alive(alive)
  55     { *alive = true; }
  56
  57     ~Y() { *alive = false; }
  58
  59     int i;
  60     const char* s;
  61     bool* alive;
  62   };
  63
  64   bool alive = false;
  65   Y* py = alloc.new_object<Y>(1, "two", &alive);
  66   VERIFY( alive );
  67   VERIFY( py->i == 1 );
  68   VERIFY( std::strcmp(py->s, "two") == 0 );
  69   VERIFY( res.number_of_active_allocations() == 1 );
  70
  71   alloc.delete_object(py);
  72   VERIFY( alive == false );
  73 }
  74
  75 int
  76 main()
  77 {
  78   test01();
  79 }