c++ - Working with templates -

im studying c++ templates , there's don't understand. far understand if have following generic class

    template <class t> class a{         ...     } 

to provide specific specialization of class, int objects, you'd define following:

    template<> class a<int>{         ...     } 

however, have been seeing cases similar following:

original class is,

    template <class t, int size> class buffer{         ...     } 

then speciliazed class objects of type int is,

    template <int size> class buffer<int, size>{         ...     } 

i'm confused why specilization int not following:

    template<> class bufffer<int, int size>{         ...     } 

can please explain.

this buffer template has 2 template parameters. first type parameter because begins class, , second non-type parameter because begins int.

what seeing partial specialization on first parameter. note template arguments template specialization totally independent of template arguments original template (this 1 of major things confused me when learning this). example, work as:

template <int n> class buffer<int, n> { ... }; 

it giving specialization when first template argument of buffer type int , second int value.

whenever start template <> (empty brackets), explicit specialization specifying all of template arguments. example, do:

template <> class buffer<int, 1> { ... }; 

this specialization when first template argument int type , second value 1.