Question

I want to do some processing before calling the second constructor. For example:

class Foo {
    Foo(){ displayWindow(); }

    //This is possible
    Foo(int bar) : Foo() { windowSize = bar; }

    //But how do I do processing before calling the second constructor?
    Foo(int bar, int baz) {
        addLabel(baz); // prototype = void addLabel(int)
        Foo(bar);
    }
}

How would I accomplish this (without using initialization functions)?

EDIT: I updated the example. It now shows that the default constructor HAS to occur last. If it doesnt, displayWindow wont take into account any of the updated variables.

Answer 1

Like this:

Foo(int bar, int baz) :
    Foo(initializeAnotherStaticLibrary(bar, baz) == -1 ? bar : baz)
{
}

(Note that delegating constructors is a feature supported only in C++11 onward.)