[cfe-commits] Handle missing 'typename' in function template definitions

Richard Smith richard at metafoo.co.uk
Tue May 15 18:12:11 PDT 2012


The attached patch allows Clang to recover better from a missing 'typename'
keyword in a function template definition:

<stdin>:1:29: error: missing 'typename' prior to dependent type name
template<typename T> void f(T::type) {}

With this patch, we carry on disambiguating past such a situation. If we
can't disambiguate the declaration in some other way, the absence of
'typename' is used to infer that we have a variable declaration. I've also
extended the disambiguation code to inspect the token immediately after the
parameter-declaration-clause to disambiguate (in the above case, the
{token is used to disambiguate, and more generally we will also look
for an
exception-specification, ref-qualifier, cv-qualifier, etc., which cannot
appear after a parenthesized initializer in a variable declaration).

Does this seem like a reasonable approach?

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