faisalv added inline comments.
================
Comment at: lib/Parse/ParseExprCXX.cpp:1116
+ if (HasExplicitTemplateParams) {
+ SmallVector<Decl*, 4> TemplateParams;
+ SourceLocation LAngleLoc, RAngleLoc;
----------------
hamzasood wrote:
> faisalv wrote:
> > hamzasood wrote:
> > > faisalv wrote:
> > > > Why not Just use/pass LSI->TemplateParams?
> > > I thought that Parser and Sema stay separate, and communicate through
> > > various ActOn functions? Directly accessing LSI would violate that.
> > Aah yes - you're right. Still it does seem a little wasteful to create two
> > of those (and then append). What are your thoughts about passing the
> > argument by (moved from) value, and then swapping their guts within ActOn
> > (i..e value-semantics) ? (I suppose the only concern would be the small
> > array case - but i think that would be quite easy for any optimizer to
> > inline).
> >
> I don't think a SmallVectorImpl can be passed by value.
>
> So to make that work, the function would either needed to be templated
> (SmallVector<Decl*, I>) or only accept a SmallVector<Decl*, 4>. And I don't
> think either of those options are worthwhile.
OK - add a FIXME that alerts folks that we currently make two copies of this
and ideally we shouldn't need to.
https://reviews.llvm.org/D36527
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