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What is the difference between NVI ( Non-Virtual Interface ) and the Template Method patterns?
They seem very similar and I’ve read both that they’re basically the same and that they’re subtly different with Template being somehow more general.
NVI is an idiom, Template Method is a pattern. NVI is an implementation of the Template Method Pattern using dynamic dispatch in C++; it is also possible to create template methods in C++ using template metaprogramming to eliminate the dynamic dispatch.
A pattern is more general than an idiom, and languages may use different idioms to implement the pattern.