40310ac76c
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@230322 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
1.5 KiB
C++
58 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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// NOTE: Older versions of clang have a bug where they fail to evalute
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// string_view::at as a constant expression.
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// XFAIL: clang-3.4, clang-3.3
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// <string_view>
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// constexpr const _CharT& at(size_type _pos) const;
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#include <experimental/string_view>
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#include <cassert>
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template <typename CharT>
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void test ( const CharT *s, size_t len ) {
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std::experimental::basic_string_view<CharT> sv ( s, len );
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assert ( sv.length() == len );
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for ( size_t i = 0; i < len; ++i ) {
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assert ( sv.at(i) == s[i] );
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assert ( &sv.at(i) == s + i );
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}
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try { sv.at(len); } catch ( const std::out_of_range & ) { return ; }
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assert ( false );
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}
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int main () {
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test ( "ABCDE", 5 );
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test ( "a", 1 );
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test ( L"ABCDE", 5 );
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test ( L"a", 1 );
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#if __cplusplus >= 201103L
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test ( u"ABCDE", 5 );
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test ( u"a", 1 );
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test ( U"ABCDE", 5 );
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test ( U"a", 1 );
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#endif
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#if __cplusplus >= 201103L
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{
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constexpr std::experimental::basic_string_view<char> sv ( "ABC", 2 );
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static_assert ( sv.length() == 2, "" );
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static_assert ( sv.at(0) == 'A', "" );
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static_assert ( sv.at(1) == 'B', "" );
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}
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#endif
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}
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