C++: λ Demystified
summary
Lambda implementation is shown as compiler-generated closure classes using C++ Insights, revealing that captures become members and call operator(s) and that reordering captures can shrink a closure from 12→8 bytes on x86-64. Examples expose traps: returning a reference-capturing lambda causes dangling references, copying members captures the this pointer (prints 4 then 5 unless dereferenced), and unused copy-captures still force allocation causing three unused-variable warnings; also five syntactic places allow lambdas to appear.
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chapters (12)
- 0:00Start
- 2:58The Evolution of Lambdas
- 5:34Trailing Return Type
- 7:23Lambdas Internals
- 9:04Call Operator
- 17:32Conversion Operator
- 22:44Generic Lambdas
- 25:29The Dangling Reference Trap
- 38:46An Unused Variable Warning
- 41:47C + + 17
- 43:48Apply Lambdas
- 45:57Immediately Invoked Function Expressions
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