libstdc++-v3/testsuite/23_containers/deque/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 <deque>
  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
  32   // FIXME: these types shouldn't be required.
  33   typedef T*        pointer;
  34   typedef const T*  const_pointer;
  35   typedef T&        reference;
  36   typedef const T&  const_reference;
  37   template <typename U>
  38     struct rebind
  39     { typedef MyAllocator<U> other; };
  40
  41   MyAllocator() = default;
  42   template <class U>
  43   MyAllocator(const MyAllocator<U>& other) : base(other.base) {}
  44   T* allocate(std::size_t n) { return base.allocate(n); }
  45   void deallocate(T* p, std::size_t n) { return base.deallocate(p, n); }
  46   template <class U, class... Args>
  47   void construct(U* p, Args&&... args)
  48   {
  49     ::new (static_cast<void*>(p)) U(std::forward<Args>(args)...);
  50   }
  51 };
  52
  53 struct A
  54 {
  55 private:
  56   friend class MyAllocator<A>;
  57   A(int value) : value(value) {}
  58   int value;
  59 public:
  60   A() : value() {}
  61   int get() const { return value; }
  62 };
  63
  64 void foo()
  65 {
  66   std::deque<A, MyAllocator<A>> v1;
  67   const int i = 1;
  68   v1.emplace_back(i); // OK
  69   std::deque<A, MyAllocator<A>> v2(std::istream_iterator<int>(), {}); // ERROR
  70 }