IPDL has a native array type

[Chris Jones]

Probably worth posting here, to make sure everyone writing IPDL
protocols knows about it.

Last week I added a native array type to IPDL, so that instead of
writing specifications like

include "nsTArray";
using nsTArray<nsCString>;
protocol Foo {
child: Msg(nsTArray<nsCString> args);
};

one can now write

protocol Foo {
child: Msg(nsCString[] args);
};

Because the native IPDL array type plays well with IPDL actor types and
unions (which nsTArray does *not*), and because the syntax is simpler, I
don't hesitate to say that nsTArray should be banned from protocols.

Cheers,
Chris

[Chris Jones]

Oops --- I forgot to add that the IPDL array type "compiles down" to
nsTArray in C++. So if you have a protocol that currently uses
nsTArray, you should be able to switch to native IPDL arrays without
changing any of your C++ code.

Cheers,
Chris