47 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <system_error>10//11// template <>12// struct hash<error_code>;13 14#include <system_error>15#include <cassert>16#include <cstddef>17#include <functional>18#include <type_traits>19 20#include "test_macros.h"21 22void23test(int i)24{25 typedef std::error_code T;26 typedef std::hash<T> H;27#if TEST_STD_VER <= 1428 static_assert((std::is_same<H::argument_type, T>::value), "" );29 static_assert((std::is_same<H::result_type, std::size_t>::value), "" );30#endif31 ASSERT_NOEXCEPT(H()(T()));32 H h;33 T ec(i, std::system_category());34 const std::size_t result = h(ec);35 LIBCPP_ASSERT(result == static_cast<std::size_t>(i));36 ((void)result); // Prevent unused warning37}38 39int main(int, char**)40{41 test(0);42 test(2);43 test(10);44 45 return 0;46}47