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 // <optional> 11 12 // class bad_optional_access; 13 // bad_optional_access& operator=(const bad_optional_access&); 14 15 #include <experimental/optional> 16 #include <string> 17 #include <cstring> 18 #include <type_traits> 19 #include <cassert> 20 21 int main() 22 { 23 #if _LIBCPP_STD_VER > 11 24 using std::experimental::bad_optional_access; 25 26 static_assert(std::is_nothrow_copy_assignable<bad_optional_access>::value, ""); 27 const std::string s1("one message"); 28 const std::string s2("another message"); 29 bad_optional_access e1(s1); 30 bad_optional_access e2(s2); 31 assert(std::strcmp(e1.what(), e2.what()) != 0); 32 e1 = e2; 33 assert(std::strcmp(e1.what(), e2.what()) == 0); 34 #endif // _LIBCPP_STD_VER > 11 35 } 36
