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Tip of the Day
Language: C++
Expertise: Beginner
Aug 17, 1998

Overloading + operator

Question:
I've been working on the + operator in my string class. I came across an interesting dilemma: the following code doesn't call any of my + operators. For example:

String st1;
st1 = "Hello" + "world";
Do I need a special kind of function to handle the type of format? I can get this to work:

String st1("Hello");
st1 = st1 + "world";

Answer:
There's really nothing you can do about this. The problem is that you are adding two char pointers together, which have nothing to do with your class. Only after these are somehow added would your class come into play. It's exactly the same situation with the string class that comes with Microsoft's MFC.

The only way to handle this is to change the way the class is used. If you add only one string at a time, it can be done.

st1 = "Hello ";
st1 += "world";
Here, each word is added directly to your class and allows your class to control how.
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