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<wchar_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<wchar_t>::compare(L"123", L"223", 3) < 0 26 && std::char_traits<wchar_t>::compare(L"223", L"123", 3) > 0 27 && std::char_traits<wchar_t>::compare(L"123", L"123", 3) == 0; 28 } 29 #endif 30 31 int main() 32 { 33 assert(std::char_traits<wchar_t>::compare(L"", L"", 0) == 0); 34 assert(std::char_traits<wchar_t>::compare(NULL, NULL, 0) == 0); 35 36 assert(std::char_traits<wchar_t>::compare(L"1", L"1", 1) == 0); 37 assert(std::char_traits<wchar_t>::compare(L"1", L"2", 1) < 0); 38 assert(std::char_traits<wchar_t>::compare(L"2", L"1", 1) > 0); 39 40 assert(std::char_traits<wchar_t>::compare(L"12", L"12", 2) == 0); 41 assert(std::char_traits<wchar_t>::compare(L"12", L"13", 2) < 0); 42 assert(std::char_traits<wchar_t>::compare(L"12", L"22", 2) < 0); 43 assert(std::char_traits<wchar_t>::compare(L"13", L"12", 2) > 0); 44 assert(std::char_traits<wchar_t>::compare(L"22", L"12", 2) > 0); 45 46 assert(std::char_traits<wchar_t>::compare(L"123", L"123", 3) == 0); 47 assert(std::char_traits<wchar_t>::compare(L"123", L"223", 3) < 0); 48 assert(std::char_traits<wchar_t>::compare(L"123", L"133", 3) < 0); 49 assert(std::char_traits<wchar_t>::compare(L"123", L"124", 3) < 0); 50 assert(std::char_traits<wchar_t>::compare(L"223", L"123", 3) > 0); 51 assert(std::char_traits<wchar_t>::compare(L"133", L"123", 3) > 0); 52 assert(std::char_traits<wchar_t>::compare(L"124", L"123", 3) > 0); 53 54 #if TEST_STD_VER > 14 55 static_assert(test_constexpr(), "" ); 56 #endif 57 } 58
