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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// <optional>
// template <class T> struct hash<optional<T>>;
#include <optional>
#include <string>
#include <memory>
#include <cassert>
#include "poisoned_hash_helper.h"
#include "test_macros.h"
struct A {};
struct B {};
namespace std {
template <>
struct hash<B> {
std::size_t operator()(B const&) noexcept(false) { return 0; }
};
}
int main(int, char**)
{
using std::optional;
const std::size_t nullopt_hash =
std::hash<optional<double>>{}(optional<double>{});
{
optional<B> opt;
ASSERT_NOT_NOEXCEPT(std::hash<optional<B>>()(opt));
ASSERT_NOT_NOEXCEPT(std::hash<optional<const B>>()(opt));
}
{
typedef int T;
optional<T> opt;
assert(std::hash<optional<T>>{}(opt) == nullopt_hash);
opt = 2;
assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
}
{
typedef std::string T;
optional<T> opt;
assert(std::hash<optional<T>>{}(opt) == nullopt_hash);
opt = std::string("123");
assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
}
{
typedef std::unique_ptr<int> T;
optional<T> opt;
assert(std::hash<optional<T>>{}(opt) == nullopt_hash);
opt = std::unique_ptr<int>(new int(3));
assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
}
{
test_hash_enabled_for_type<std::optional<int> >();
test_hash_enabled_for_type<std::optional<int*> >();
test_hash_enabled_for_type<std::optional<const int> >();
test_hash_enabled_for_type<std::optional<int* const> >();
test_hash_disabled_for_type<std::optional<A>>();
test_hash_disabled_for_type<std::optional<const A>>();
test_hash_enabled_for_type<std::optional<B>>();
test_hash_enabled_for_type<std::optional<const B>>();
}
return 0;
}
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