43 lines
923 B
C++
43 lines
923 B
C++
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//===----------------------------------------------------------------------===//
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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 <system_error>
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#include <cassert>
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#include <type_traits>
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void
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test(int i)
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{
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typedef std::error_code T;
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typedef std::hash<T> H;
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static_assert((std::is_base_of<std::unary_function<T, std::size_t>,
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H>::value), "");
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H h;
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T ec(i, std::system_category());
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assert(h(ec) == i);
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}
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int main()
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{
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test(0);
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test(2);
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test(10);
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}
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