forked from OSchip/llvm-project
80 lines
2.2 KiB
C++
80 lines
2.2 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 begin() const;
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#include <experimental/string_view>
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#include <cassert>
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#include "test_macros.h"
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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::iterator b = s.begin();
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typename S::const_iterator cb1 = cs.begin();
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typename S::const_iterator cb2 = s.cbegin();
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if (!s.empty())
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{
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assert( *b == s[0]);
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assert( &*b == &s[0]);
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assert( *cb1 == s[0]);
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assert(&*cb1 == &s[0]);
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assert( *cb2 == s[0]);
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assert(&*cb2 == &s[0]);
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}
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assert( b == cb1);
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assert( b == cb2);
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assert(cb1 == cb2);
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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 TEST_STD_VER >= 11
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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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#if _LIBCPP_STD_VER > 11
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{
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constexpr string_view sv { "123", 3 };
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constexpr u16string_view u16sv {u"123", 3 };
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constexpr u32string_view u32sv {U"123", 3 };
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constexpr wstring_view wsv {L"123", 3 };
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static_assert ( *sv.begin() == sv[0], "" );
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static_assert ( *u16sv.begin() == u16sv[0], "" );
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static_assert ( *u32sv.begin() == u32sv[0], "" );
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static_assert ( *wsv.begin() == wsv[0], "" );
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static_assert ( *sv.cbegin() == sv[0], "" );
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static_assert ( *u16sv.cbegin() == u16sv[0], "" );
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static_assert ( *u32sv.cbegin() == u32sv[0], "" );
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static_assert ( *wsv.cbegin() == wsv[0], "" );
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}
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#endif
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}
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