forked from OSchip/llvm-project
61 lines
1.3 KiB
C++
61 lines
1.3 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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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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for (int i = 0; i <= 5; ++i)
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{
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T t(i);
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if (sizeof(T) <= sizeof(std::size_t))
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assert(h(t) == t);
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}
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}
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int main()
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{
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test<bool>();
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test<char>();
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test<signed char>();
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test<unsigned char>();
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test<char16_t>();
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test<char32_t>();
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test<wchar_t>();
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test<short>();
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test<unsigned short>();
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test<int>();
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test<unsigned int>();
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test<long>();
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test<unsigned long>();
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test<long long>();
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test<unsigned long long>();
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}
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