| //===----------------------------------------------------------------------===// |
| // |
| // 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>(); |
| } |