libstdc++-v3/testsuite/20_util/tuple/cons/90700.cc

   1 // Copyright (C) 2019-2020 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 { target c++11 } }
  19
  20 #include <tuple>
  21 #include <memory>
  22
  23 struct X { };
  24
  25 struct Y
  26 {
  27   Y(const std::tuple<X>&) = delete;
  28   Y(std::tuple<X>&&) { throw 1; }
  29   Y(const X&) { }
  30 };
  31
  32 struct Z
  33 {
  34   Z(X&&) { }
  35   Z(const std::tuple<X>&) { throw 1; }
  36   Z(std::tuple<X>&&) = delete;
  37 };
  38
  39 void
  40 test01()
  41 {
  42   // PR libstdc++/90700 wrong constraints on constructor
  43   const std::allocator<int> a;
  44   const std::tuple<X> x;
  45
  46   static_assert(!std::is_convertible<const std::tuple<X>&, Y>::value, "");
  47   static_assert(!std::is_constructible<Y, const std::tuple<X>&>::value, "");
  48   static_assert(!std::is_same<Y, X>::value, "");
  49   // should use tuple<Y>::tuple<X>(allocator_arg_t, const A&, const tuple<X>&)
  50   // and construct Y from X:
  51   std::tuple<Y> y(std::allocator_arg, a, x);
  52 }
  53
  54 void
  55 test02()
  56 {
  57   const std::allocator<int> a;
  58   std::tuple<X> x;
  59
  60   static_assert(!std::is_convertible<std::tuple<X>, Z>::value, "");
  61   static_assert(!std::is_constructible<Z, std::tuple<X>>::value, "");
  62   static_assert(!std::is_same<Z, X>::value, "");
  63   // should use tuple<Z>::tuple<X>(allocator_arg_t, const A&, tuple<X>&&)
  64   // and construct Z from X:
  65   std::tuple<Z> z(std::allocator_arg, a, std::move(x));
  66 }