aaron.ballman added inline comments.
================
Comment at: lib/ASTMatchers/Dynamic/Registry.cpp:77
+ internal::MatcherDescriptor *matchDescriptor, StringRef MatcherName) {
+ auto K = ast_type_traits::ASTNodeKind::getFromNodeKind<
+ typename
ast_matchers::internal::VariadicAllOfMatcher<ResultT>::Type>();
----------------
zturner wrote:
> steveire wrote:
> > aaron.ballman wrote:
> > > steveire wrote:
> > > > aaron.ballman wrote:
> > > > > Mildly not keen on the use of `auto` here. It's a factory function,
> > > > > so it kind of names the resulting type, but it also looks like the
> > > > > type will be
> > > > > `ast_matchers::internal::VariadicAllOfMatcher<ResultT>::Type` from
> > > > > the template argument, which is incorrect.
> > > > There is no reason to assume that taking a template argument means that
> > > > type is result.
> > > >
> > > > The method is `getFrom` which decreases the ambiguity still further.
> > > >
> > > > Spelling out the type doesn't add anything useful. This should be ok.
> > > > There is no reason to assume that taking a template argument means that
> > > > type is result.
> > >
> > > Aside from all the other places that do exactly that (getAs<>, cast<>,
> > > dyn_cast<>, castAs<>, and so on). Generally, when we have a function
> > > named get that takes a template type argument, the result when seen in
> > > proximity to auto is the template type.
> > >
> > > > Spelling out the type doesn't add anything useful. This should be ok.
> > >
> > > I slept on this one and fall on the other side of it; using auto hides
> > > information that tripped up at least one person when reading the code, so
> > > don't use auto. It's not clear enough what the resulting type will be.
> > I put this in the category of requiring
> >
> > SomeType ST = SomeType::create();
> >
> > instead of
> >
> > auto ST = SomeType::create();
> >
> > `ast_type_traits::ASTNodeKind` is already on that line and you want to see
> > it again.
> >
> FWIW I'm with Aaron here. Im' not familiar at all with this codebase, and
> looking at the code, my first instinct is "the result type is probably
> `ast_matchers::internal::VariadicAllOfMatcher<ResultT>::Type`". According to
> Aaron's earlier comment, that is incorrect, so there's at least 1 data point
> that it hinders readability.
>
> So, honest question. What *is* the return type here?
> So, honest question. What *is* the return type here?
Much to my surprise, it's `ASTNodeKind`. It was entirely unobvious to me that
this was a factory function.
Repository:
rC Clang
https://reviews.llvm.org/D54405
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