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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // <functional> 10 11 // template <class T> 12 // struct hash 13 // { 14 // size_t operator()(T val) const; 15 // }; 16 17 #include <bitset> 18 #include <cassert> 19 #include <type_traits> 20 21 #include "test_macros.h" 22 23 template <std::size_t N> 24 void test()25test() 26 { 27 typedef std::bitset<N> T; 28 typedef std::hash<T> H; 29 #if TEST_STD_VER <= 14 30 static_assert((std::is_same<typename H::argument_type, T>::value), "" ); 31 static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" ); 32 #endif 33 ASSERT_NOEXCEPT(H()(T())); 34 35 H h; 36 T bs(static_cast<unsigned long long>(N)); 37 const std::size_t result = h(bs); 38 LIBCPP_ASSERT(result == N); 39 ((void)result); // Prevent unused warning 40 } 41 main(int,char **)42int main(int, char**) 43 { 44 test<0>(); 45 test<10>(); 46 test<100>(); 47 test<1000>(); 48 49 return 0; 50 } 51