C++ Lambda (cont)

Lambda expressions (since C++11)

Constructs a closure (an unnamed function object capable of capturing variables in scope).

Syntax

Lambda expressions without an explicit template parameter list (possibly non-generic)


`[`captures `]` front-attr (optional) `(`params `)` specs (optional) except (optional) back-attr (optional) trailing (optional) requires (optional) contract-specs (optional) `{` body `}`	(1)

`[`captures `] {` body `}`	(2)	(until C++23)

`[`captures `]` front-attr (optional) trailing (optional) contract-specs (optional) `{` body `}`	(2)	(since C++23)

`[`captures `]` front-attr (optional) except back-attr (optional) trailing (optional) contract-specs (optional) `{` body `}`	(3)	(since C++23)

`[`captures `]` front-attr (optional) specs except (optional) back-attr (optional) trailing (optional) contract-specs (optional) `{` body `}`	(4)	(since C++23)

Lambda expressions with an explicit template parameter list (always generic) (since C++20)


`[`captures `] <`tparams `>` t-requires (optional) front-attr (optional) `(`params `)` specs (optional) except (optional) back-attr (optional) trailing (optional) requires (optional) contract-specs (optional) `{` body `}`	(1)

`[`captures `] <`tparams `>` t-requires (optional) `{` body `}`	(2)	(until C++23)

`[`captures `] <`tparams `>` t-requires (optional) front-attr (optional) trailing (optional) contract-specs (optional) `{` body `}`	(2)	(since C++23)

`[`captures `] <`tparams `>` t-requires (optional) front-attr (optional) except back-attr (optional) trailing (optional) contract-specs (optional) `{` body `}`	(3)	(since C++23)

`[`captures `] <`tparams `>` t-requires (optional) front-attr (optional) specs except (optional) back-attr (optional) trailing (optional) contract-specs (optional) `{` body `}`	(4)	(since C++23)

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