[cfe-commits] [patch] Allow vector<id<protocol>> in objc++11

Richard Smith richard at metafoo.co.uk
Thu Dec 13 19:45:35 PST 2012

On Thu, Dec 13, 2012 at 7:26 PM, Nico Weber <thakis at chromium.org> wrote:
> Hi,
> C++11 allowed writing "vector<vector<int>>" without a space between ">" and
> ">".
> Objective-C++11 doesn't seem to allow "vector<id<protocol>>" though, and the
> diagnostic message clang emits for it even gets worse with -std=c++11
> (PR14603).
> The attached patch allows vector<id<protocol>> (only in c++11 mode) by
> pulling the parsing code for >> into its own function and calling it from
> the objc protocol parsing code. In C++98-mode, this also improves the
> produced diagnostic. I'm aware this is a language change, but it's more
> permissive so it shouldn't break existing code, and the change feels
> consistent with c++11 to me.
> If you think the language change part is not desirable, I'd want to land the
> patch but make the new function not suppress the '>>' diagnostic when called
> from the protocol parser, for the improved diagnostic.

The patch looks fine, and the language change makes sense to me, but
please wait for someone with more knowledge about Objective-C to
confirm that this is OK.

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