Lightning Talk: operator for - C++ Generator Ranges Without Coroutine Overhead
summary
Proposes operator for as a language-level transform that turns a body written like a coroutine into a lambda-taking function so ranges can use the fast callback pattern without coroutine overhead. Demonstrates concatenating three vectors of 30 elements (90 ints) and summing them; std::generator version suffers about 20× slowdown caused by heap allocation and state-machine overhead, while the callback approach inlines and avoids allocations. Shows how break maps to a boolean return and how the compiler emits the lambda and state handling automatically.
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