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 const char_type* find(const char_type* s, size_t n, const char_type& a); 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 constexpr const char *p = "123"; 26 return std::char_traits<char>::find(p, 3, '1') == p 27 && std::char_traits<char>::find(p, 3, '2') == p + 1 28 && std::char_traits<char>::find(p, 3, '3') == p + 2 29 && std::char_traits<char>::find(p, 3, '4') == nullptr; 30 } 31 #endif 32 33 int main() 34 { 35 char s1[] = {1, 2, 3}; 36 assert(std::char_traits<char>::find(s1, 3, char(1)) == s1); 37 assert(std::char_traits<char>::find(s1, 3, char(2)) == s1+1); 38 assert(std::char_traits<char>::find(s1, 3, char(3)) == s1+2); 39 assert(std::char_traits<char>::find(s1, 3, char(4)) == 0); 40 assert(std::char_traits<char>::find(s1, 3, char(0)) == 0); 41 assert(std::char_traits<char>::find(NULL, 0, char(0)) == 0); 42 43 #if TEST_STD_VER > 14 44 static_assert(test_constexpr(), "" ); 45 #endif 46 } 47
