Function Extraction with Lambda Expressions
summary
Shows a concrete recipe to extract code by wrapping the fragment in an immediately-invoked lambda, compile, then iteratively remove captures so the compiler reveals the exact parameters needed. Demonstrates this on a map update example where wrapping isolates initialization and lets the compiler force the return type, then converting captures to function parameters lets one copy the body into a free function and decide by-value or by-reference and const qualification. Mentions variants for member functions and templates.
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