//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // <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 <cmath> template <class T> void test() { static_assert((std::is_base_of<std::unary_function<T, std::size_t>, std::hash<T> >::value), ""); std::hash<T> h; std::size_t t0 = h(0.); std::size_t tn0 = h(-0.); std::size_t tp1 = h(0.1); std::size_t t1 = h(1); std::size_t tn1 = h(-1); std::size_t pinf = h(INFINITY); std::size_t ninf = h(-INFINITY); assert(t0 == tn0); assert(t0 != tp1); assert(t0 != t1); assert(t0 != tn1); assert(t0 != pinf); assert(t0 != ninf); assert(tp1 != t1); assert(tp1 != tn1); assert(tp1 != pinf); assert(tp1 != ninf); assert(t1 != tn1); assert(t1 != pinf); assert(t1 != ninf); assert(tn1 != pinf); assert(tn1 != ninf); assert(pinf != ninf); } int main() { test<float>(); test<double>(); test<long double>(); }