c++ - Creating an alias for an instantiated template -

i had number of signal processing filter classes identical apart few constants defining filter characteristic, decided change these template class maintainability , extensibility. there performance , memory management reasons preferring template on constructor arguments in case; embedded system.

consequently have template class of form:

template <int size, int scale_multiplier, int scale_shift> class cboxcarfilter { public:     // allow access size @ runtime.     static const int filter_size = size ;     ... } 

which explicitly instantiate thus, example:

template class cboxcarfilter<8, 1, 3> 

the problem when need access filter_size member requires:

cboxcarfilter<8, 1, 3>::filter_size 

which rather makes access filter_size redundant since must repeated in arguments. solution problem this:

// create alias filter #define cspecialistboxcarfilter cboxcarfilter<8, 1, 3> template class cspecialistboxcarfilter ; 

then can access filter_size thus:

cspecialistboxcarfilter::filter_size 

this has advantage of meaningful unique names each filter instance in original non-templated versions, seems smelly me using macro looks class since has different scope semantics.

is there better way of creating alias class names template instance?

yes, typedef!

typedef cboxcarfilter<8, 1, 3> cspecialistboxcarfilter;