various questions

[bearophile]

This is better, probably it can be improves a bit more:

import std.stdio: writeln;
import std.metastrings: Format;
import std.typetuple: TypeTuple;

template Iota(int stop) {
    static if (stop <= 0)
        alias TypeTuple!() Iota;
    else
        alias TypeTuple!(Iota!(stop-1), stop-1) Iota;
}

void foo(T, int N, int M)() {
    writeln(typeid(T), " ", N, " ", M);
}

enum string[] types = ["int", "float", "short"];
enum string[] sizes = ["small", "medium", "large"];

enum Type : string { int_type = types[0], float_type = types[1], short_type = types[2] }
enum Size { small = 100, medium = 200, large = 250 }

void main() {
    Type run_t = Type.int_type;
    Size run_n = Size.medium;
    Size run_m = Size.small;

    enum string pattern = "if (run_t == Type.%s_type && run_n == Size.%s && run_m == Size.%s) { foo!(%s, Size.%s, Size.%s)(); goto END; }";

    foreach (t; Iota!(types.length))
        foreach (n; Iota!(sizes.length))
            foreach (m; Iota!(sizes.length))
                mixin(Format!(pattern, types[t], sizes[n], sizes[m], types[t], sizes[n], sizes[m]));

    END: {}
}


Bye,
bearophile