Re: How to hand in a closure variable

[bearophile]

Bienlein:

Whereas this does not compile:
immutable int b = (int) {
        if(1 == 1) {
                return 123;
        } else {
                return 456;
        }
}(); // line x  

However, this does compile and displays correctly 123:

immutable int b = (int) {
        if(1 == 1) {
                return 123;
        } else {
                return 456;
        }
}(1); // line y 
                
writeln(b);

Note it says () in line x and (1) in line y. The (1) in line y 
is redundant, but the stuff then compiles.

If your D function has one argument, you have to give it one 
argument, even if it doesn't have a visible name and it's unused.

Bye,
bearophile