forked from OSchip/llvm-project
56 lines
1.3 KiB
C++
56 lines
1.3 KiB
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 <string_view>
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#include <cassert>
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#include <type_traits>
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using std::string_view;
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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::string g1 = "1234567890";
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// std::string g2 = "1234567891";
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typedef typename T::value_type char_type;
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char_type g1 [ 10 ];
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char_type g2 [ 10 ];
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for ( int i = 0; i < 10; ++i )
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g1[i] = g2[9-i] = '0' + i;
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T s1(g1, 10);
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T s2(g2, 10);
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assert(h(s1) != h(s2));
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}
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int main()
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{
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test<std::string_view>();
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#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
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test<std::u16string_view>();
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test<std::u32string_view>();
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#endif // _LIBCPP_HAS_NO_UNICODE_CHARS
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test<std::wstring_view>();
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}
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