forked from OSchip/llvm-project
71 lines
1.5 KiB
C++
71 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <functional>
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// template <class T>
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// struct hash
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// : public unary_function<T, size_t>
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// {
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// size_t operator()(T val) const;
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// };
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// Not very portable
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#include <functional>
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#include <cassert>
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#include <type_traits>
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#include <limits>
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#include <cmath>
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template <class T>
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void
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test()
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{
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typedef std::hash<T> H;
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static_assert((std::is_same<typename H::argument_type, T>::value), "" );
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static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
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H h;
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std::size_t t0 = h(0.);
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std::size_t tn0 = h(-0.);
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std::size_t tp1 = h(0.1);
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std::size_t t1 = h(1);
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std::size_t tn1 = h(-1);
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std::size_t pinf = h(INFINITY);
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std::size_t ninf = h(-INFINITY);
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assert(t0 == tn0);
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assert(t0 != tp1);
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assert(t0 != t1);
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assert(t0 != tn1);
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assert(t0 != pinf);
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assert(t0 != ninf);
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assert(tp1 != t1);
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assert(tp1 != tn1);
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assert(tp1 != pinf);
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assert(tp1 != ninf);
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assert(t1 != tn1);
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assert(t1 != pinf);
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assert(t1 != ninf);
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assert(tn1 != pinf);
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assert(tn1 != ninf);
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assert(pinf != ninf);
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}
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int main()
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{
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test<float>();
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test<double>();
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test<long double>();
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}
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