3bb903e3c0
P0513R0 is essentially a collective resolution paper of LWG2543, LWG2791, LWG2809, and LWG2817. Among these LWG issues, LWG2543 (conditionally enabled `hash`) and LWG2817 (`hash<nullptr_t>`) affect pre-C++17 utilities. We generally backport changes from LWG issues, so this patch backports the relevant parts of P0513R0. Although we provide `hash<unique_ptr>` as an extension in C++03 mode, as C++03 mode isn't encouraged now, this patch leaves `hash<unique_ptr>` unchanged in C++03 mode.
66 lines
1.5 KiB
C++
66 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
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// <functional>
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// template <class T>
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// struct hash
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// : public unary_function<T, size_t>
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// {
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// size_t operator()(T val) const;
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// };
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// XFAIL: FROZEN-CXX03-HEADERS-FIXME
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// Not very portable
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#include <cassert>
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#include <cstddef>
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#include <functional>
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#include <type_traits>
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#include "test_macros.h"
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template <class T>
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void
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test()
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{
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typedef std::hash<T> H;
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#if TEST_STD_VER <= 17
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static_assert((std::is_same<typename H::argument_type, T>::value), "");
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static_assert((std::is_same<typename H::result_type, std::size_t>::value), "");
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#endif
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ASSERT_NOEXCEPT(H()(T()));
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H h;
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typedef typename std::remove_pointer<T>::type type;
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type i;
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type j;
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assert(h(&i) != h(&j));
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}
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void test_nullptr() {
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typedef std::nullptr_t T;
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typedef std::hash<T> H;
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#if TEST_STD_VER <= 17
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static_assert((std::is_same<typename H::argument_type, T>::value), "");
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static_assert((std::is_same<typename H::result_type, std::size_t>::value), "");
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#endif
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ASSERT_NOEXCEPT(H()(T()));
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}
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int main(int, char**)
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{
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test<int*>();
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test_nullptr();
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return 0;
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}
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