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

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2011-2021 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 <cstddef>
  22 #include <testsuite_hooks.h>
  23
  24 struct X { };
  25
  26 template<typename T>
  27 struct hintable_allocator
  28 {
  29   typedef T value_type;
  30   struct const_void_pointer { };
  31   typedef unsigned size_type;
  32
  33   hintable_allocator() : called(false) { }
  34
  35   bool called;
  36
  37   // this is the overload that should get called:
  38   T* allocate(size_type n, const_void_pointer) { called = true; return 0; }
  39
  40   // none of these should get called:
  41   T* allocate(size_type n);
  42   T* allocate(size_type n, void*);
  43   T* allocate(size_type n, const void*);
  44   T* allocate(size_type n, const_void_pointer) const;
  45 };
  46
  47 void test01()
  48 {
  49   typedef std::allocator_traits<hintable_allocator<X>> traits_type;
  50   traits_type::allocator_type a;
  51   traits_type::const_void_pointer v;
  52   X* p __attribute__((unused)) = traits_type::allocate(a, 1, v);
  53   VERIFY( a.called );
  54 }
  55
  56 template<typename T>
  57 struct unhintable_allocator
  58 {
  59   typedef T value_type;
  60   typedef unsigned size_type;
  61
  62   unhintable_allocator() : called(false) { }
  63
  64   bool called;
  65
  66   // this is the overload that should get called:
  67   T* allocate(size_type n) { called = true; return 0; }
  68
  69   // this should not get called:
  70   T* allocate(size_type n, void*);
  71 };
  72
  73 void test02()
  74 {
  75   typedef std::allocator_traits<unhintable_allocator<X>> traits_type;
  76   traits_type::allocator_type a;
  77   traits_type::const_void_pointer v;
  78   X* p __attribute__((unused)) = traits_type::allocate(a, 1, v);
  79   VERIFY( a.called );
  80 }
  81
  82 int main()
  83 {
  84   test01();
  85   test02();
  86 }