Templated method on T inside a templated class on TT : Is that possible/correct?

This is indeed the correct way of doing what you want to do, and it will work on every decent C++ compiler. I tested it on gcc4.4 and the latest clang release.

This is indeed the correct way of doing what you want to do, and it will work on every decent C++ compiler. I tested it on gcc4.4 and the latest clang release. There are problems/surprises/constraints behind any kind of code.

The major issue you could eventually run in with this code is that you can't make a templated function virtual, so if you want to get polymorphism at the class level for your templated function, you're off implementing it with an external function.

I think It's OK to do that. Take a look for example at std::vector implementation. You have class vector, which has a few template parameters (most notably an element type), and inside, one of its constructors is declared in similar way as your method.It has InputIterator as a template parameter.

So I think that this is not so uncommon practice.

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