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Value Categories, Move and Perfect Forwarding · 3:37

The Greediest Function in C++

A function template taking a forwarding reference matches almost any argument exactly, so in overload resolution it beats promotions, added const and derived-to-base conversions. We watch it steal a short from an int overload, hijack copying a non-const Person and a derived class's copy, then fix it with a C++20 requires-clause.

You will learn

Explain why a T&& overload is an exact match for almost any argument
Predict when a forwarding-reference overload beats an int overload or a copy constructor
Recognise the derived-class copy-constructor trap
Constrain a forwarding template with a C++20 requires-clause (and know the older alternatives)

Chapters

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