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Since C++11 was released there has always been quite some interest in forwarding references among people practicing C++. On one hand, it is a very powerful mechanism, on the other, it requires quite some knowledge about how templates work so it is met with a lot of fear among people learning C++.
In this video, we cover everything there is to know about forwarding references, why we might want to use them and how they work. This includes talking about reference collapsing and std::forward as the mechanisms that enable forwarding references to do what they are supposed to do.
📚 As always, you can find the full script to this video as well as all the code shown on the screen here: https://github.com/cpp-for-yourself/supplementary-materials/blob/main/lectures/forwarding_references.md
🔗 *Links*
▪️ Forwarding references: https://en.cppreference.com/w/cpp/language/reference#Forwarding_references
▪️ Universal references by Scott Meyers: https://isocpp.org/blog/2012/11/universal-references-in-c11-scott-meyers
▪️ Arthur O'Dwyer's post about forwarding references: https://quuxplusone.github.io/blog/2022/02/02/look-what-they-need/
▪️ Reference collapsing: https://en.cppreference.com/w/cpp/language/reference#Reference_collapsing
▪️ std::is_same: https://en.cppreference.com/w/cpp/types/is_same
▪️ std::remove_reference_t: https://en.cppreference.com/w/cpp/types/remove_reference
▪️ Example code for forward: https://cppinsights.io/s/e48f0dba
00:00 - Start
01:27 - Why use forwarding references
08:35 - How forward references work
14:03 - Summary
Video of "black magic" by Kampus Production: https://www.pexels.com/video/girl-preparing-a-magic-potion-7965019/
Photo of Scott Meyers by Eugene Zelenko - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=27460170