compare.pass.cpp (2230B)
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 int compare(const char_type* s1, const char_type* s2, size_t n); 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>::compare(u8"123", u8"223", 3) < 0 26 && std::char_traits<char8_t>::compare(u8"223", u8"123", 3) > 0 27 && std::char_traits<char8_t>::compare(u8"123", u8"123", 3) == 0; 28 } 29 30 31 int main() 32 { 33 assert(std::char_traits<char8_t>::compare(u8"", u8"", 0) == 0); 34 assert(std::char_traits<char8_t>::compare(NULL, NULL, 0) == 0); 35 36 assert(std::char_traits<char8_t>::compare(u8"1", u8"1", 1) == 0); 37 assert(std::char_traits<char8_t>::compare(u8"1", u8"2", 1) < 0); 38 assert(std::char_traits<char8_t>::compare(u8"2", u8"1", 1) > 0); 39 40 assert(std::char_traits<char8_t>::compare(u8"12", u8"12", 2) == 0); 41 assert(std::char_traits<char8_t>::compare(u8"12", u8"13", 2) < 0); 42 assert(std::char_traits<char8_t>::compare(u8"12", u8"22", 2) < 0); 43 assert(std::char_traits<char8_t>::compare(u8"13", u8"12", 2) > 0); 44 assert(std::char_traits<char8_t>::compare(u8"22", u8"12", 2) > 0); 45 46 assert(std::char_traits<char8_t>::compare(u8"123", u8"123", 3) == 0); 47 assert(std::char_traits<char8_t>::compare(u8"123", u8"223", 3) < 0); 48 assert(std::char_traits<char8_t>::compare(u8"123", u8"133", 3) < 0); 49 assert(std::char_traits<char8_t>::compare(u8"123", u8"124", 3) < 0); 50 assert(std::char_traits<char8_t>::compare(u8"223", u8"123", 3) > 0); 51 assert(std::char_traits<char8_t>::compare(u8"133", u8"123", 3) > 0); 52 assert(std::char_traits<char8_t>::compare(u8"124", u8"123", 3) > 0); 53 54 static_assert(test_constexpr(), "" ); 55 } 56 #else 57 int main () {} 58 #endif