Summary
Jason demonstrates C++17's node handle feature that allows efficient transfer of elements between associative containers (map, set, and their variants) without copies, moves, or allocations. The extract() method removes a node from a container returning a handle that can be inserted elsewhere, while merge() efficiently moves all non-duplicate elements from one container to another by stealing the underlying nodes. This feature is particularly valuable for performance-critical code that needs to reorganize data across multiple containers while avoiding the overhead of copying or reallocating node-based container elements.
Related C++ Standard Sections
This episode covers topics found in these sections of the C++ standard:
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[diff.cpp03.containers]62% match -
[new.delete]58% match