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952eaecfc6
Summary: Exactly what the title says. This patch also adds a `std::hash<nullptr_t>` specialization in C++17, but it was not added by this paper and I can't find the actual paper that adds it. See http://wg21.link/P0513R0 for more info. If there are no comments in the next couple of days I'll commit this Reviewers: mclow.lists, K-ballo, EricWF Reviewed By: EricWF Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D28938 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@292684 91177308-0d34-0410-b5e6-96231b3b80d8
65 lines
1.5 KiB
C++
65 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 <string_view>
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#include <string>
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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 SV>
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void
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test()
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{
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typedef std::hash<SV> H;
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static_assert((std::is_same<typename H::argument_type, SV>::value), "" );
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static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
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typedef typename SV::value_type char_type;
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typedef std::basic_string<char_type> String;
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typedef std::hash<String> SH;
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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] = static_cast<char_type>('0' + i);
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H h;
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SH sh;
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SV s1(g1, 10);
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String ss1(s1);
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SV s2(g2, 10);
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String ss2(s2);
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assert(h(s1) == h(s1));
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assert(h(s1) != h(s2));
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assert(sh(ss1) == h(s1));
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assert(sh(ss2) == 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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