optional parameters

[mangocinn]

In C++, how do I declare a function that has an optional parameter?

I searched the knowledge base and was not able to find anything about optional parameters.

Does setting the default value of the parameter in the function declaration automatically make it optional?


void MyFunction(const std::string& parameter1, const std::string& parameter2);
I need to make parameter2 optional and default it to parameter1.

 

[uolj]

Yes, setting a default value automatically makes a parameter optional. However, you cannot default an optional parameter to the value of another parameter. One way to get around this is to overload the function like this:

void MyFunction(const std::string& parameter1)
{
  MyFunction(parameter1, parameter1);
}
void MyFunction(const std::string& parameter1, const std::string& parameter2);

 

[mangocinn]

Thank you very much uolj!