libstdc++-v3/testsuite/23_containers/vector/52591.cc

   1 // Copyright (C) 2012-2014 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile }
  19 // { dg-options "-std=gnu++11" }
  20
  21 // libstdc++/52591
  22
  23 #include <vector>
  24 #include <memory>
  25 #include <type_traits>
  26
  27 // As an extension we allow move-assignment of std::vector when the element
  28 // type is not MoveAssignable, as long as the allocator type propagates or
  29 // is known to always compare equal.
  30
  31 struct C
  32 {
  33     C& operator=(C&&) = delete;
  34 };
  35
  36 template<typename T>
  37 struct A1 : std::allocator<T>
  38 {
  39   template<typename U> struct rebind { typedef A1<U> other; };
  40
  41   A1() = default;
  42   template<typename U> A1(const A1<U>&) { }
  43
  44   using propagate_on_container_move_assignment = std::true_type;
  45 };
  46
  47 void test01()
  48 {
  49   using test_type = std::vector<C, A1<C>>;
  50   static_assert(std::is_nothrow_move_assignable<test_type>::value,
  51       "vector is nothrow move-assignable if allocator propagates");
  52 }
  53
  54 template<typename T>
  55 struct A2 : std::allocator<T>
  56 {
  57   template<typename U> struct rebind { typedef A1<U> other; };
  58
  59   A2() = default;
  60   template<typename U> A2(const A2<U>&) { }
  61
  62   using propagate_on_container_move_assignment = std::false_type;
  63 };
  64
  65 namespace __gnu_cxx
  66 {
  67   template<typename T>
  68     struct __allocator_always_compares_equal<A2<T>> : std::true_type
  69     { };
  70 }
  71
  72 void test02()
  73 {
  74   using test_type = std::vector<C, A2<C>>;
  75   static_assert(std::is_nothrow_move_assignable<test_type>::value,
  76       "vector is nothrow move-assignable if allocator is always equal");
  77 }