Foreach over tuple of arrays?

[Philippe Sigaud]

Hi Sean,

> This doesn't work when passing a delegate as func, however. Is there a way to
> circumvent this?

I tried this with a delegate and a function template, it seems to work:


import std.typecons;

void bar(T)(ref T elem)
{
   elem = elem+1;
}

void main()
{
    auto data = tuple([0,1,2,3], [3,2,1], [0,1]);

    auto foo = (ref int i){ i = i * i;};

    writeln(data);

    foreach(index, range; data.expand)
        foreach(ref element; range)
            foo(element);

    writeln(data);

    foreach(index, range; data.expand)
        foreach(ref element; range)
            bar(element);

    writeln(data);
}


data.expand is only needed to get access to the underlying expression
template in the 'data' tuple.
Your own ArrayTuple!(T) may have other way to do that.