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<char16_t> 13 14 // static int compare(const char_type* s1, const char_type* s2, size_t n); 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<char16_t>::compare(u"123", u"223", 3) < 0 26 && std::char_traits<char16_t>::compare(u"223", u"123", 3) > 0 27 && std::char_traits<char16_t>::compare(u"123", u"123", 3) == 0; 28 } 29 #endif 30 31 32 int main() 33 { 34 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 35 #if TEST_STD_VER >= 11 36 assert(std::char_traits<char16_t>::compare(u"", u"", 0) == 0); 37 assert(std::char_traits<char16_t>::compare(NULL, NULL, 0) == 0); 38 39 assert(std::char_traits<char16_t>::compare(u"1", u"1", 1) == 0); 40 assert(std::char_traits<char16_t>::compare(u"1", u"2", 1) < 0); 41 assert(std::char_traits<char16_t>::compare(u"2", u"1", 1) > 0); 42 43 assert(std::char_traits<char16_t>::compare(u"12", u"12", 2) == 0); 44 assert(std::char_traits<char16_t>::compare(u"12", u"13", 2) < 0); 45 assert(std::char_traits<char16_t>::compare(u"12", u"22", 2) < 0); 46 assert(std::char_traits<char16_t>::compare(u"13", u"12", 2) > 0); 47 assert(std::char_traits<char16_t>::compare(u"22", u"12", 2) > 0); 48 49 assert(std::char_traits<char16_t>::compare(u"123", u"123", 3) == 0); 50 assert(std::char_traits<char16_t>::compare(u"123", u"223", 3) < 0); 51 assert(std::char_traits<char16_t>::compare(u"123", u"133", 3) < 0); 52 assert(std::char_traits<char16_t>::compare(u"123", u"124", 3) < 0); 53 assert(std::char_traits<char16_t>::compare(u"223", u"123", 3) > 0); 54 assert(std::char_traits<char16_t>::compare(u"133", u"123", 3) > 0); 55 assert(std::char_traits<char16_t>::compare(u"124", u"123", 3) > 0); 56 #endif 57 58 #if TEST_STD_VER > 14 59 static_assert(test_constexpr(), "" ); 60 #endif 61 #endif // _LIBCPP_HAS_NO_UNICODE_CHARS 62 } 63
