Re: Can opApply be made @nogc?

[rikki cattermole via Digitalmars-d-learn]

On 20/10/2018 12:32 PM, solidstate1991 wrote:

Since it's a bit difficult to make tree traversal through range (especially if someone wants to make it @nogc), I thought I'll make it through opApply override, however the delegate passed by it doesn't have the @nogc attribute, which would automatically make it incapable to be used in a @nogc context.

I also don't know if it would work with structs instead of classes, since they're easier to handle in a @nogc situation.

class Foo
{
    uint[2] array;

    int opApply(scope int delegate(ref uint) @nogc dg) @nogc
    {
        int result = 0;

        for (int i = 0; i < array.length; i++)
        {
            result = dg(array[i]);
            if (result)
                break;
        }
        return result;
    }
}

void test()
{
    Foo a = new Foo();

    a.array[0] = 73;
    a.array[1] = 82;

    foreach (uint u; a)
    {
        printf("%d\n", u);
    }
}