​

import std;

​

// Your code

Algebraic!T parse(T...)(string s)

{

    foreach(t; T)

    {

        try

            return Algebraic!T(to!t(s));

        catch (Exception e)

        { }

    }

    assert(0);

}

​

alias TypesMap = AliasSeq!(

    "-p", Tuple!(int, string), 

    "--name", Tuple!string,

    "-h", Tuple!float

);

​

alias AllowedTypes(string Param) = RepresentationTypeTuple!(TypesMap[staticIndexOf!(Param, TypesMap)+1]);

​

void main()

{

    parse!(AllowedTypes!"-p")("asd").writeln;

    parse!(AllowedTypes!"-h")("3.1").writeln;

}