First of all, you forgot to specify the return type of the function (void
). Secondly, you need to have two template<>
: one because you are explicitly specializing the class template, and one because you are explicitly specializing its member function template.
Therefore, this is the correct syntax:
template<> // Because you are explicitly specializing the A class template
template<> // Because you are explicitly specializing the `Fun()` member template
void A<1>::Fun<int>()
{
/* some code here. */
}