On Wednesday, 17 August 2016 at 19:15:48 UTC, ag0aep6g wrote:
On 08/17/2016 08:38 PM, Engine Machine wrote:
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With MySequence being a type, you can do this:
----
static if (is(x.args[2] == MySequence!Args, Args ...))
{
...
}
----
It works! Nifty that you can do that with is.
Aside from this check, there is probably not much use for
MySequence being a type. So I'm be tempted to find a way to do
the check with a raw template MySequence.
As you said, another enum alone doesn't cut it. The faker can
just add the same enum.
But a private enum of a private type might do it:
----
template MySequence(Args ...)
{
/* ... length and args ... */
private enum id = Id();
}
private struct Id {}
enum isMySequence(alias seq) = is(typeof(seq.id) == Id);
----
Other modules can't use the Id type directly, because it's
private. And they can't use typeof(MySequence!foo.id), because
the id member is private, too.
However, I wouldn't be surprised if this can be circumvented
too.
Well, the is does work and that probably is the best solution. I
don't mind the extra type at this point. Of course, a library
solution for this type of stuff would be nice. I'd rather not
have to even use a type but rather use arrays:
[a,b,[c,d]].
