You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <functional>
|
|
|
|
// template <class T>
|
|
// struct hash
|
|
// : public unary_function<T, size_t>
|
|
// {
|
|
// size_t operator()(T val) const;
|
|
// };
|
|
|
|
// Not very portable
|
|
|
|
#include <functional>
|
|
#include <cassert>
|
|
#include <type_traits>
|
|
#include <limits>
|
|
|
|
#include "test_macros.h"
|
|
|
|
template <class T>
|
|
void
|
|
test()
|
|
{
|
|
typedef std::hash<T> H;
|
|
static_assert((std::is_same<typename H::argument_type, T>::value), "" );
|
|
static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
|
|
ASSERT_NOEXCEPT(H()(T()));
|
|
H h;
|
|
|
|
typedef typename std::remove_pointer<T>::type type;
|
|
type i;
|
|
type j;
|
|
assert(h(&i) != h(&j));
|
|
}
|
|
|
|
// can't hash nullptr_t until C++17
|
|
void test_nullptr()
|
|
{
|
|
#if TEST_STD_VER > 14
|
|
typedef std::nullptr_t T;
|
|
typedef std::hash<T> H;
|
|
static_assert((std::is_same<typename H::argument_type, T>::value), "" );
|
|
static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
|
|
ASSERT_NOEXCEPT(H()(T()));
|
|
#endif
|
|
}
|
|
|
|
int main(int, char**)
|
|
{
|
|
test<int*>();
|
|
test_nullptr();
|
|
|
|
return 0;
|
|
}
|