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

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2011-2016 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   static int counter;
  27   X() { }
  28   X(const X&) { ++counter; }
  29   explicit X(int) { ++counter; }
  30   X(int, int) { ++counter; }
  31   X(int, int, int) { ++counter; }
  32 };
  33
  34 int X::counter = 0;
  35
  36 template<typename T>
  37 struct fake_allocator
  38 {
  39   typedef T value_type;
  40
  41   fake_allocator() : counter() {}
  42
  43   int counter;
  44
  45   T* allocate(std::size_t n) { return (T*)new char[n*sizeof(T)]; }
  46   void deallocate(T* p, std::size_t) { delete[] (char*)p; }
  47
  48   // don't actually construct anything when these are called
  49   void construct(T* p) { ++counter; }
  50   void construct(T* p, int, int) { ++counter; }
  51 };
  52
  53 void test01()
  54 {
  55   bool test __attribute__((unused)) = true;
  56
  57   typedef std::allocator_traits<fake_allocator<X>> traits_type;
  58   traits_type::allocator_type a;
  59   X* p = traits_type::allocate(a, 1);
  60   traits_type::construct(a, p);
  61   VERIFY( a.counter == 1 );
  62   traits_type::construct(a, p, 1);
  63   VERIFY( a.counter == 1 );
  64   VERIFY( X::counter == 1 );
  65   traits_type::destroy(a, p);
  66   traits_type::construct(a, p, 1, 1);
  67   VERIFY( a.counter == 2 );
  68   VERIFY( X::counter == 1 );
  69   traits_type::construct(a, p, 1, 1, 1);
  70   VERIFY( a.counter == 2 );
  71   VERIFY( X::counter == 2 );
  72   traits_type::destroy(a, p);
  73   traits_type::deallocate(a, p, 1);
  74 }
  75
  76 int main()
  77 {
  78   test01();
  79 }