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Templates and Generic Programming · 3:39

Variadic Templates and Fold Expressions

How one template accepts any number of arguments of any types. We see why printf can't be trusted, build a type-safe print that peels its parameter pack one argument at a time (and why it needs if constexpr), draw fold expressions as trees to see why the side of the dots matters, fold the stream and comma operators, and see how make_unique forwards a whole pack.

You will learn

Declare a variadic template and explain what a parameter pack is
Write head/tail recursion that stops with if constexpr and sizeof...
Predict the result of left and right folds, including non-associative operators and empty packs
Explain how make_unique accepts and forwards any number of constructor arguments

Chapters

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