1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // <string> 10 11 // template<> struct char_traits<wchar_t> 12 13 // static size_t length(const char_type* s); 14 // constexpr in C++17 15 16 #include <string> 17 #include <cassert> 18 19 #include "test_macros.h" 20 21 #if TEST_STD_VER > 14 test_constexpr()22constexpr bool test_constexpr() 23 { 24 return std::char_traits<wchar_t>::length(L"") == 0 25 && std::char_traits<wchar_t>::length(L"abcd") == 4; 26 } 27 #endif 28 main(int,char **)29int main(int, char**) 30 { 31 assert(std::char_traits<wchar_t>::length(L"") == 0); 32 assert(std::char_traits<wchar_t>::length(L"a") == 1); 33 assert(std::char_traits<wchar_t>::length(L"aa") == 2); 34 assert(std::char_traits<wchar_t>::length(L"aaa") == 3); 35 assert(std::char_traits<wchar_t>::length(L"aaaa") == 4); 36 37 #if TEST_STD_VER > 14 38 static_assert(test_constexpr(), "" ); 39 #endif 40 41 return 0; 42 } 43