On Friday, 17 May 2013 at 22:15:09 UTC, bearophile wrote:
Josh:

Is something like this possible in D?

void main()
{
   int x, y, z;
   write("Increment which variable: ");
   string input = readln()[0..$ - 1];
   findVar(input)++;
   writeln(x, y, z);
}

The Go language and its standard library make the usage of such runtime reflection much simpler than in D. So I think D has to improve on such things.

A starting point:



import std.stdio, std.string;

void main() {
    int x, y, z;
    auto findVar = ["x": &x, "y": &y, "z": &z];
    "Increment which variable: ".write;
    const input = readln.chomp;
    (*findVar[input])++;
    writeln(x, y, z);
}



With __FUNCTION__ you can tell the name of the current function, but how do you find the caller function? And how do you find the names of the local variables in the caller function?

D is a statically compiled language, and its templates allow to do lot of stuff at compile-time. But some run-time reflection is handy in many cases.

Bye,
bearophile

Bearophile, is your findVar an AA? It looks like it is, I just didn't think you could put refs in an AA.

Thanks

Josh

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