Summary
This episode introduces C++23's new fold algorithms: fold_left, fold_left_first, fold_right, fold_right_first, fold_left_with_iter, and fold_left_first_with_iter. Jason explains how these algorithms relate to existing ones like accumulate and reduce, and highlights their behavior differences. He demonstrates a key advantage of fold_left_first over accumulate: it avoids the type issues that can occur when an initial value is required, by using the first element of the range as the starting point and returning an std::optional to handle empty ranges.
Related C++ Standard Sections
This episode covers topics found in these sections of the C++ standard:
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[accumulate]72% match -
[arithmetic.operations]40% match -
[ranges]40% match