On Wed, 22 Apr 2009 13:42:27 +0900, dsimcha <[email protected]> wrote:
It's basically a tuple with some special properties. Let's say I have a
template struct:
struct Joint(T...) {
T ranges;
}
It's built with:
SomeType joint(T...)(T args) { // do stuff. }
When one of the arguments is a Joint, I want it to flatten. For example,
Joint!(uint[], uint[]) r1;
uint[] r2;
auto result = joint(r1, r2);
// result is a Joint!(uint[], uint[], uint[]), not a
// Joint!(Joint!(uint[], uint[]), uint[]).
Is there an easy metaprogramming trick that I've overlooked to make stuff
flatten like this?
Hi,
---
import std.stdio, std.typetuple, std.traits;
struct Joint(T...)
{
T ranges;
}
template flatten(T...)
{
static if (T.length == 0)
alias T flatten;
else
alias TypeTuple!(FieldTypeTuple!(T[0]), flatten!(T[1..$])) flatten;
}
Joint!(flatten!(T)) joint(T...)(T args)
{
typeof(return) result;
return result;
}
void main()
{
Joint!(uint[], uint[]) r1;
uint[] r2;
auto result = joint(r1, r2);
writeln(result);
}
---
Tested dmd 2.029 on Windows XP.
--
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