1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <functional> 11 12 // template <class T> 13 // struct hash 14 // : public unary_function<T, size_t> 15 // { 16 // size_t operator()(T val) const; 17 // }; 18 19 // Not very portable 20 21 #include <functional> 22 #include <cassert> 23 #include <type_traits> 24 #include <limits> 25 #include <cmath> 26 27 #include "test_macros.h" 28 29 template <class T> 30 void test()31test() 32 { 33 typedef std::hash<T> H; 34 static_assert((std::is_same<typename H::argument_type, T>::value), "" ); 35 static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" ); 36 ASSERT_NOEXCEPT(H()(T())); 37 H h; 38 39 std::size_t t0 = h(0.); 40 std::size_t tn0 = h(-0.); 41 std::size_t tp1 = h(static_cast<T>(0.1)); 42 std::size_t t1 = h(1); 43 std::size_t tn1 = h(-1); 44 std::size_t pinf = h(INFINITY); 45 std::size_t ninf = h(-INFINITY); 46 assert(t0 == tn0); 47 assert(t0 != tp1); 48 assert(t0 != t1); 49 assert(t0 != tn1); 50 assert(t0 != pinf); 51 assert(t0 != ninf); 52 53 assert(tp1 != t1); 54 assert(tp1 != tn1); 55 assert(tp1 != pinf); 56 assert(tp1 != ninf); 57 58 assert(t1 != tn1); 59 assert(t1 != pinf); 60 assert(t1 != ninf); 61 62 assert(tn1 != pinf); 63 assert(tn1 != ninf); 64 65 assert(pinf != ninf); 66 } 67 main()68int main() 69 { 70 test<float>(); 71 test<double>(); 72 test<long double>(); 73 } 74