length.pass.cpp (1185B)
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 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 10 11 // <string> 12 13 // template<> struct char_traits<char8_t> 14 15 // static constexpr size_t length(const char_type* s); 16 17 #include <string> 18 #include <cassert> 19 20 #include "test_macros.h" 21 22 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L 23 constexpr bool test_constexpr() 24 { 25 return std::char_traits<char8_t>::length(u8"") == 0 26 && std::char_traits<char8_t>::length(u8"abcd") == 4; 27 } 28 29 int main() 30 { 31 assert(std::char_traits<char8_t>::length(u8"") == 0); 32 assert(std::char_traits<char8_t>::length(u8"a") == 1); 33 assert(std::char_traits<char8_t>::length(u8"aa") == 2); 34 assert(std::char_traits<char8_t>::length(u8"aaa") == 3); 35 assert(std::char_traits<char8_t>::length(u8"aaaa") == 4); 36 37 static_assert(test_constexpr(), ""); 38 } 39 #else 40 int main() { } 41 #endif