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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <string>
// template<> struct char_traits<wchar_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<wchar_t>::length(L"") == 0
&& std::char_traits<wchar_t>::length(L"abcd") == 4;
}
#endif
int main()
{
assert(std::char_traits<wchar_t>::length(L"") == 0);
assert(std::char_traits<wchar_t>::length(L"a") == 1);
assert(std::char_traits<wchar_t>::length(L"aa") == 2);
assert(std::char_traits<wchar_t>::length(L"aaa") == 3);
assert(std::char_traits<wchar_t>::length(L"aaaa") == 4);
#if TEST_STD_VER > 14
static_assert(test_constexpr(), "" );
#endif
}
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