libstdc++-v3/testsuite/23_containers/vector/cons/55977.cc

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2013-2019 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 <utility>
  22 #include <vector>
  23 #include <iterator>
  24
  25 template <class T>
  26 struct MyAllocator
  27 {
  28   std::allocator<T> base;
  29   typedef T value_type;
  30   MyAllocator() = default;
  31   template <class U>
  32   MyAllocator(const MyAllocator<U>& other) : base(other.base) {}
  33   T* allocate(std::size_t n) { return base.allocate(n); }
  34   void deallocate(T* p, std::size_t n) { return base.deallocate(p, n); }
  35   template <class U, class... Args>
  36   void construct(U* p, Args&&... args)
  37   {
  38     ::new (static_cast<void*>(p)) U(std::forward<Args>(args)...);
  39   }
  40 };
  41
  42 struct A
  43 {
  44 private:
  45   friend class MyAllocator<A>;
  46   A(int value) : value(value) {}
  47   int value;
  48 public:
  49   A() : value() {}
  50   int get() const { return value; }
  51 };
  52
  53 void foo()
  54 {
  55   std::vector<A, MyAllocator<A>> v1;
  56   const int i = 1;
  57   v1.emplace_back(i); // OK
  58   std::vector<A, MyAllocator<A>> v2(std::istream_iterator<int>(), {}); // ERROR
  59 }