C++23 Fold Algorithms

An introduction to the 6 new folding algorithms added in C++23, providing alternatives to std::reduce and std::accumulate

Ryan McCombe
Updated
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Questions & Answers

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Difference Between Reduce and Fold Algorithms
What is the difference between std::reduce() and the new fold algorithms introduced in C++23?
Choosing Between Fold Left and Fold Right
How do I decide whether to use fold_left() or fold_right()?
Using Fold with Custom Data Types
Can fold_left() and fold_right() be used with custom data types?
Advantages of Fold Algorithms
What are the advantages of using fold_left() over accumulate()?
Using Custom Operators with Fold
How do I use fold_left_first() with custom operators?
Initial Value in Fold Algorithms
What happens if the initial value provided to fold_left() is not the identity of the operation?
Practical Applications of Fold Algorithms
What are some practical applications of fold algorithms in real-world programming?