I have this section of code that was previously compiling fine with the Microsoft compiler. I have now switched to clang and am receiving the following errors:
Error 16 error : expected member name or ';' after declaration specifiers'
-
Error 15 error : expected a qualified name after 'typename'
for the line of code
template<typename PRIM> typename const PRIM::OutputPtrType GetData(unsigned long index = 0) const;
Does anyone know what the problem is?
Switch your typename const
to const typename
.
template<typename PRIM> const typename PRIM::OutputPtrType GetData(unsigned long index = 0) const;
The C++ Grammar rules for templates
has an entry for typename
which dictates:
typename... opt identifier opt .
typename nested-name-specifier identifier
const
isn't an identifier
rather a cv-qualifier
. An identifier in your context is a dependent name. which is basically PRIM::OutputPtrType
, since OutputPtrType
will depend on the name PRIM
. For the second line, we can more accurately say that PRIM::
is a nested-name-specifier.
EDIT
$14.6:1 When a qualified-id is intended to refer to a type that is not a member of the current instantiation ( [temp.dep.type] ) and its nested-name-specifier refers to a dependent type, it shall be prefixed by the keyword typename, forming a typename-specifier. If the qualified-id in a typename-specifier does not denote a type, the program is ill-formed.
typename-specifier: typename nested-name-specifier identifier typename nested-name-specifier templateopt simple-template-id
You have to move const
to the right:
template<typename PRIM>
typename PRIM::OutputPtrType const GetData(unsigned long index = 0) const;
^^^^^
Or to the left:
template<typename PRIM>
const typename PRIM::OutputPtrType GetData(unsigned long index = 0) const;
^^^^^
In this context after the typename
keyword the compiler expects a qualified name.
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