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C++ Concepts: More than Syntactic Requirements

by Jonathan Boccara

From the article:

After years and years of expectation, concepts have finally made it in C++20.

Concepts are descriptions in code of a set of expressions that must be valid with a given type. Those are syntactic requirements. But there is more to concepts than that: concepts also have semantic requirements.

Before getting into that, here is a recap of what concepts are. If you’re already familiar with concepts you can skip to the section on semantic requirements...