length.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <string>
// template<> struct char_traits<char32_t>
// static size_t length(const char_type* s);
// constexpr in C++17
#include <string>
#include <cassert>
#include "test_macros.h"
#if TEST_STD_VER > 14
constexpr bool test_constexpr()
{
return std::char_traits<char32_t>::length(U"") == 0
&& std::char_traits<char32_t>::length(U"abcd") == 4;
}
#endif
int main(int, char**)
{
#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
#if TEST_STD_VER >= 11
assert(std::char_traits<char32_t>::length(U"") == 0);
assert(std::char_traits<char32_t>::length(U"a") == 1);
assert(std::char_traits<char32_t>::length(U"aa") == 2);
assert(std::char_traits<char32_t>::length(U"aaa") == 3);
assert(std::char_traits<char32_t>::length(U"aaaa") == 4);
#endif
#if TEST_STD_VER > 14
static_assert(test_constexpr(), "" );
#endif
#endif // _LIBCPP_HAS_NO_UNICODE_CHARS
return 0;
}