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 23 constexpr 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 31 int 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
