Thread: Prevent member variable from being modified after construction

Originally Posted by AH_Tze

Code:

Foo(int in): member(in) {
}

Ah. It works. But could you explain that syntax?

I had tried:

Code:

Foo(int in) {
      member = in; 
};

and gotten an "illegal assignment of read-only data member" from dev-c++.

I don't understand the difference between the two.

In the first syntax the variable is initalised as it constucted. In the second the variable is initialised after it is constructed which is illegal since the variable is const.

Ah. I'd seen something similiar using user-defined types, but I'd never seen a primitive data type being initialized that way. Very clever.

Thanks all, and I am once again in Preludes debt.