How to partially specialize nested class without partially specializing the nesting class?
Implementation of class C is the same for all N.
Implementation of C::iterator is special for N=1.
template<class T, int N>
class C
{
class iterator;
...
};
template<class T, int N>
class C<T, N>::iterator
{
...
};
// Partial specialization doesn't compile:
template<class T>
class C<T, 1>::iterator
{
...
};
I can partially specialize class C for N=1, but that's a lot of code duplication...
If you do not want to specialize whole class then just move the iterator out of class and make it template:
template<class T, int N>
class C_iterator
{
...
};
If needed make your specializations:
template<class T>
class C_iterator<T, 1>
{
...
};
Then use it in your class as iterator, if needed befriend it:
template<class T, int N>
class C
{
using iterator = C_iterator<T, N>;
friend iterator;
...
};
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