47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <string>
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// template<> struct char_traits<char16_t>
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// static size_t length(const char_type* s);
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// constexpr in C++17
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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#if TEST_STD_VER > 14
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constexpr bool test_constexpr()
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{
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return std::char_traits<char16_t>::length(u"") == 0
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&& std::char_traits<char16_t>::length(u"abcd") == 4;
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}
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#endif
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int main(int, char**)
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{
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#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
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#if TEST_STD_VER >= 11
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assert(std::char_traits<char16_t>::length(u"") == 0);
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assert(std::char_traits<char16_t>::length(u"a") == 1);
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assert(std::char_traits<char16_t>::length(u"aa") == 2);
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assert(std::char_traits<char16_t>::length(u"aaa") == 3);
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assert(std::char_traits<char16_t>::length(u"aaaa") == 4);
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#endif
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#if TEST_STD_VER > 14
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static_assert(test_constexpr(), "" );
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#endif
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#endif // _LIBCPP_HAS_NO_UNICODE_CHARS
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return 0;
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}
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