How do I override the bool operator in a C++ class?

Question

I\'m defining a ReturnValue class in C++ that needs to report whether a method was successful. I want objects of the class to evaluate to true on s

Answer 1

It's better to use explicit keyword or it will interfere with other overloads like operator+

Here is an example :

class test_string
{
public:
   std::string        p_str;

   explicit operator bool()                  
   { 
     return (p_str.size() ? true : false); 
   }
};

and the use :

test_string s;

printf("%s\n", (s) ? s.p_str.c_str() : "EMPTY");