there are partial and full specializations for template
class, and only full partial specialization for template
function.

template <class T, size_t size>
class Object {};

full specialization:
template <> class Object<int, 10> {};

partial specialization:
template <size_t size> class Object<char, size> {};

Function specialization:
template <typename T>
void reserve(T begin, T end)

Specialization:
void reserver(char *begin, char *end) //actually overload
function