Pure higher order functions

[bearophile]

Daniel Murphy:

> Only for strongly pure functions - not const pure at this point.

I see, OK.


> Still, it should make construction of immutable structures without casting a lot easier.

I presume you mean something like this ("function" is currently required if you want to add "pure" too):


void main() {
    int n = 5; // mutable;

    immutable data = function(in int m) pure {
        class Foo {}
        auto array = new Foo[m];
        foreach (ref item; array)
            item = new Foo;
        return array;
    }(n);

    // use data here
}

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If you have some more energy, Walter has (I think) accepted two of my enhancement requests, but they don't have a complete patch yet (both have low priority):

3827 automatic joining of adjacent strings is bad [partial patch present]
5409 Disallow (!x & y)

Bye,
bearophile