> On Oct 5, 2016, at 9:06 PM, Cao Jiannan via swift-evolution
> <[email protected]> wrote:
>
> for example:
>
> var a = 1
>
> let block = { [inout a] in
> a += 1
> }
>
> block()
> block()
>
> print(a) // 3
This is already how captures work by default in closures and nested functions
in Swift:
var a = 1
let block = { a += 1 }
block()
block()
print(a) // prints 3
If you want to capture something immutably you can put it in the capture list:
var a = 1
let block = { [a] in a += 1 } // error: left side of mutating operator isn't
mutable: 'a' is a 'let' constant
Mark
>
>
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