forked from OSchip/llvm-project
67 lines
1.7 KiB
C++
67 lines
1.7 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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// <string_view>
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// constexpr const_iterator rend() const;
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#include <experimental/string_view>
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#include <cassert>
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template <class S>
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void
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test(S s)
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{
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const S& cs = s;
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typename S::reverse_iterator e = s.rend();
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typename S::const_reverse_iterator ce1 = cs.rend();
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typename S::const_reverse_iterator ce2 = s.crend();
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if (s.empty())
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{
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assert( e == s.rbegin());
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assert(ce1 == cs.rbegin());
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assert(ce2 == s.rbegin());
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}
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else
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{
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assert( e != s.rbegin());
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assert(ce1 != cs.rbegin());
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assert(ce2 != s.rbegin());
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}
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assert( e - s.rbegin() == s.size());
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assert(ce1 - cs.rbegin() == cs.size());
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assert(ce2 - s.crbegin() == s.size());
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assert( e == ce1);
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assert( e == ce2);
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assert(ce1 == ce2);
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}
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int main()
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{
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typedef std::experimental::string_view string_view;
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typedef std::experimental::u16string_view u16string_view;
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typedef std::experimental::u32string_view u32string_view;
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typedef std::experimental::wstring_view wstring_view;
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test(string_view ());
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test(u16string_view());
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test(u32string_view());
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test(wstring_view ());
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test(string_view ( "123"));
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test(wstring_view (L"123"));
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#if __cplusplus >= 201103L
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test(u16string_view{u"123"});
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test(u32string_view{U"123"});
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#endif
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}
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