1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// <string> 11 12// template<> struct char_traits<char> 13 14// static size_t length(const char_type* s); 15// constexpr in C++17 16 17#include <string> 18#include <cassert> 19 20#include "test_macros.h" 21 22#if TEST_STD_VER > 14 23constexpr bool test_constexpr() 24{ 25 return std::char_traits<char>::length("") == 0 26 && std::char_traits<char>::length("abcd") == 4; 27} 28#endif 29 30 31int main() 32{ 33 assert(std::char_traits<char>::length("") == 0); 34 assert(std::char_traits<char>::length("a") == 1); 35 assert(std::char_traits<char>::length("aa") == 2); 36 assert(std::char_traits<char>::length("aaa") == 3); 37 assert(std::char_traits<char>::length("aaaa") == 4); 38 39#if TEST_STD_VER > 14 40 static_assert(test_constexpr(), "" ); 41#endif 42} 43