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// Copyright (C) 2019-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-do run { target c++11 } }
#include <memory>
template<typename Func, typename Arg, typename = void>
struct is_callable
: std::false_type
{ };
template<typename Func, typename Arg>
struct is_callable<Func, Arg,
decltype((void)(std::declval<Func&>()(std::declval<Arg>())))>
: std::true_type
{ };
void
test01()
{
struct D {
struct pointer { };
void operator()(pointer) const noexcept { }
};
static_assert( !is_callable<std::hash<D::pointer>&, D::pointer>::value );
using UP = std::unique_ptr<int, D>;
// [unord.hash]
// Disabled specializations of hash are not function object types
static_assert( !is_callable<std::hash<UP>&, UP>::value );
static_assert( !is_callable<std::hash<UP>&, UP&>::value );
static_assert( !is_callable<std::hash<UP>&, const UP&>::value );
}
struct D {
struct pointer { };
void operator()(pointer) const noexcept { }
};
bool operator==(D::pointer, std::nullptr_t) { return false; }
bool operator!=(D::pointer, std::nullptr_t) { return true; }
namespace std {
template<> struct hash<D::pointer> {
size_t operator()(D::pointer) const { throw 1; }
};
}
void
test02()
{
using UP = std::unique_ptr<int, D>;
UP p;
std::hash<UP> h;
try {
// [util.smartptr.hash]
// The member functions are not guaranteed to be noexcept.
h(p);
throw "should not reach here";
} catch (int) {
// Should catch exception here, rather than terminating.
}
// Should still be noexcept if the underlying hash object is:
using UP2 = std::unique_ptr<int>;
UP2 p2;
std::hash<UP2> h2;
static_assert( noexcept(h2(p2)), "operator() is noexcept" );
}
int
main()
{
test02();
}
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