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

   1 // { dg-do compile { target c++11 } }
   2
   3 // Copyright (C) 2013-2025 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 #include <istream>
  25
  26 template <class T>
  27 struct MyAllocator
  28 {
  29   std::allocator<T> base;
  30   typedef T value_type;
  31   MyAllocator() = default;
  32   template <class U>
  33   MyAllocator(const MyAllocator<U>& other) : base(other.base) {}
  34   T* allocate(std::size_t n) { return base.allocate(n); }
  35   void deallocate(T* p, std::size_t n) { return base.deallocate(p, n); }
  36   template <class U, class... Args>
  37   void construct(U* p, Args&&... args)
  38   {
  39     ::new (static_cast<void*>(p)) U(std::forward<Args>(args)...);
  40   }
  41 };
  42
  43 struct A
  44 {
  45 private:
  46   friend class MyAllocator<A>;
  47   A(int value) : value(value) {}
  48   int value;
  49 public:
  50   A() : value() {}
  51   int get() const { return value; }
  52 };
  53
  54 void foo()
  55 {
  56   std::vector<A, MyAllocator<A>> v1;
  57   const int i = 1;
  58   v1.emplace_back(i); // OK
  59   std::vector<A, MyAllocator<A>> v2(std::istream_iterator<int>(), {}); // ERROR
  60 }