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42 lines
1.2 KiB
C++
42 lines
1.2 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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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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// <string>
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// template<> struct char_traits<char8_t>
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// static constexpr size_t length(const char_type* s);
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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 defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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constexpr bool test_constexpr()
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{
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return std::char_traits<char8_t>::length(u8"") == 0
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&& std::char_traits<char8_t>::length(u8"abcd") == 4;
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}
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int main()
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{
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assert(std::char_traits<char8_t>::length(u8"") == 0);
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assert(std::char_traits<char8_t>::length(u8"a") == 1);
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assert(std::char_traits<char8_t>::length(u8"aa") == 2);
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assert(std::char_traits<char8_t>::length(u8"aaa") == 3);
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assert(std::char_traits<char8_t>::length(u8"aaaa") == 4);
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static_assert(test_constexpr(), "");
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}
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#else
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int main() { }
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#endif
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