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#include <iostream>
using namespace std;
 
#define DELETE 42
 
 
class DatabaseManager 
{
 
public:
 
     enum class Action { SAVE , DELETE };
 
 
};
 
 
int main() {
 
/*	
	DatabaseManager::Action act{DatabaseManager::Acr::AC_DELETE};
 
	if (act != DatabaseManager::AC_SAVE ) {
		std::cout << "It works!";
	}
*/	
	return 0;
}

prog.cpp:4:16: error: expected identifier before numeric constant
 #define DELETE 42
                ^~
prog.cpp:12:33: note: in expansion of macro ‘DELETE’
      enum class Action { SAVE , DELETE };
                                 ^~~~~~
prog.cpp:4:16: error: expected ‘}’ before numeric constant
 #define DELETE 42
                ^~
prog.cpp:12:33: note: in expansion of macro ‘DELETE’
      enum class Action { SAVE , DELETE };
                                 ^~~~~~
prog.cpp:12:24: note: to match this ‘{’
      enum class Action { SAVE , DELETE };
                        ^
prog.cpp:4:16: error: expected unqualified-id before numeric constant
 #define DELETE 42
                ^~
prog.cpp:12:33: note: in expansion of macro ‘DELETE’
      enum class Action { SAVE , DELETE };
                                 ^~~~~~
prog.cpp:15:1: error: expected declaration before ‘}’ token
 };
 ^

Standard output is empty