What is POI and what does it mean?

Question

What is POI? I have seen this term being used several times in context of C++ Templates. What does it mean?

Answer 1

POI means Point Of Instantiation.

From C++ Templates : The Complete Guide

10.3.2 Points of Instantiation

A point of instantiation (POI) is created when a code construct refers to a template specialization in such a way that the definition of the corresponding template needs to be instantiated to create that specialization. The POI is a point in the source where the substituted template could be inserted.:

Answer 2

Point Of Instantiation. It's important with templates largely because the meaning of a symbol inside the template can depend on the meaning attached to that symbol at the point of instantiation.