Loop Exit Blocks: A proposal for C++20
summary
Proposal for an end-of-loop syntax that attaches two optional blocks: one runs when a loop finishes naturally and one runs when it exits by break. Concrete claims: enables range-based for over rvalue containers by providing lifetime extension of the loop’s initializer, removes the need for awkward lambdas, gotos, or duplicating tests, and makes patterns like “find-and-erase or assert if not found” expressible without moving the loop body into a helper function.
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