C++ Lambda Idioms
summary
Covers concrete techniques and gotchas: how closure types are generated, the unary-plus trick for forcing conversion to function pointer, using immediately-invoked lambda for complex const initialization (works for move-only types via init-capture), init-capture to avoid per-iteration allocations, generic lambdas create operator() templates, inheriting lambdas to make an overload set, a static-local lambda trick to run initialization exactly once (faster than std::call_once in one benchmark), and C++23’s deducing-this enabling natural recursive lambdas.
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chapters (16)
- 0:00Introduction
- 1:25Lambda Expressions
- 6:15Unary Trick
- 8:30Captures
- 13:08Local Variables
- 16:35Immediately Invoked Functions
- 22:57Never Again
- 26:24Generic Lambda
- 30:38Variable Template
- 38:14Init Capture
- 41:15Class Template Argument Deduction
- 46:36C20 Lambda Changes
- 53:22C23 Lambda Changes
- 53:33C23 Deducing
- 55:53Recursive Lambda
- 58:38Tree Traversal
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