Re: Calls `this(this)` extra with delegate stuff in the code

[Ali Çehreli via Digitalmars-d-learn]

Simplified:

import std.stdio;
struct Widget {
    private int[] array;
    this(uint length) {
        array = new int[length];
        writefln("ctor called      : %s", array.ptr);
    }
    this(this) {
        writef( "this(this) called: %s", array.ptr );
        array = array.dup;
        writefln(" -> %s", array.ptr);
    }
}

void main() {
    auto w1 = Widget(10);
    writeln(w1);
}

It's due to the copies that are made when calling writeln and other 
functions that it calls.

Ali