libstdc++-v3/testsuite/21_strings/basic_string/allocator/wchar_t/lwg2788.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-effective-target cxx11-abi }
   3
   4 // 2019-05-27  Nina Dinka Ranns  <dinka.ranns@gmail.com>
   5 //
   6 // Copyright (C) 2015-2020 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 #include <string>
  24 #include <testsuite_hooks.h>
  25
  26 using C = wchar_t;
  27 using traits = std::char_traits<C>;
  28 int constructCount = 0;
  29
  30 static void resetCounter()
  31 {
  32  constructCount = 0;
  33 }
  34
  35 template <class Tp>
  36 struct TestAllocator
  37 {
  38   typedef Tp value_type;
  39   using size_type = unsigned;
  40
  41   TestAllocator() noexcept { constructCount++; }
  42
  43   template <class T>
  44   TestAllocator(const TestAllocator<T>&) {}
  45
  46   Tp *allocate(std::size_t n)
  47   { return std::allocator<Tp>().allocate(n); }
  48
  49   void deallocate(Tp *p, std::size_t n)
  50   { std::allocator<Tp>().deallocate(p, n); }
  51
  52 };
  53
  54 template <class T, class U>
  55 bool operator==(const TestAllocator<T>&, const TestAllocator<U>&)
  56 { return true; }
  57 template <class T, class U>
  58 bool operator!=(const TestAllocator<T>&, const TestAllocator<U>&)
  59 { return false; }
  60
  61 void test01()
  62 {
  63   typedef TestAllocator<C> alloc_type;
  64   typedef std::basic_string<C, traits, alloc_type> test_type;
  65   test_type v1{alloc_type()};
  66   std::wstring v2{L"some_content"};
  67
  68   resetCounter();
  69   v1.assign(v2.begin(),v2.end());
  70   VERIFY( constructCount == 0);
  71
  72   v1.append(v2.begin(),v2.end());
  73   VERIFY( constructCount == 0);
  74
  75   v1.insert(v1.begin(),v1.begin(),v1.end());
  76   VERIFY( constructCount == 0);
  77
  78   v1.replace(v1.begin(),v1.end(),v1.begin(),v1.end());
  79   VERIFY( constructCount == 0);
  80 }
  81 int main()
  82 {
  83   test01();
  84   return 0;
  85 }