Doctor J wrote:
<snip>
Correct. At compile time, I want to build up an associative array
mapping type tuples to integers. Then, again at compile time, I want
to query it.
How about this?
----------
import std.typetuple, std.stdio;
template typesToInt(T1 : int, T2 : float) {
const int typesToInt = 1;
}
template typesToInt(T1 : long, T2 : double) {
const int typesToInt = 2;
}
template intToTypes(int T : 1) {
alias TypeTuple!(int, float) intToTypes;
}
template intToTypes(int T : 2) {
alias TypeTuple!(long, double) intToTypes;
}
// testing code from this point forward
void listTypes(T...)() {
writefln();
foreach (type; T) writefln(typeid(type));
}
void main() {
writefln(typesToInt!(int, float));
writefln(typesToInt!(long, double));
listTypes!(intToTypes!(1))();
listTypes!(intToTypes!(2))();
}
----------
HTH
Stewart.
