Types of Fold Expression
Fold expressions come in four types:
1. Unary Right Fold:
(pack op ...)
2. Unary Left Fold:
(... op pack)
3. Binary Right Fold:
(pack op ... op init)
4. Binary Left Fold:
(init op ... op pack)
In a binary fold expression, both operators op must be the same.
Fold Expressions in C++ 17
Fold expressions in C++17 are a powerful feature that allows you to reduce or “fold” a parameter pack over a binary operator. They were introduced to simplify code that operates on variadic templates and make it more concise and readable.
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