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[Changelog] Add SE-0253: func callAsFunction. #26866

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Merged
merged 4 commits into from
Sep 1, 2019
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[Changelog] Add SE-0253: func callAsFunction. #26866

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c834be8
[Changelog] Add SE-0253: `func callAsFunction`.
dan-zheng Aug 27, 2019
651dd4f
Clarify `callAsFunction` result.
dan-zheng Aug 27, 2019
6b97339
Add more features.
dan-zheng Aug 28, 2019
a206668
Use a list for clearer formatting.
dan-zheng Aug 28, 2019
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24 changes: 24 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -26,6 +26,29 @@ CHANGELOG
Swift Next
----------

* [SE-0253][]:

Values of types that declare `func callAsFunction` methods can be called
like functions. The call syntax is shorthand for applying
`func callAsFunction` methods.

```swift
struct Adder {
var base: Int
func callAsFunction(_ x: Int) -> Int {
return x + base
}
}
var adder = Adder(base: 3)
adder(10) // returns 13, same as `adder.callAsFunction(10)`
```

* `func callAsFunction` argument labels are required at call sites.
* Multiple `func callAsFunction` methods on a single type are supported.
* `mutating func callAsFunction` is supported.
* `func callAsFunction` works with `throws` and `rethrows`.
* `func callAsFunction` works with trailing closures.

* [SR-4206][]:

A method override is no longer allowed to have a generic signature with
Expand Down Expand Up @@ -7711,6 +7734,7 @@ Swift 1.0
[SE-0244]: <https://github.com/apple/swift-evolution/blob/master/proposals/0244-opaque-result-types.md>
[SE-0245]: <https://github.com/apple/swift-evolution/blob/master/proposals/0245-array-uninitialized-initializer.md>
[SE-0252]: <https://github.com/apple/swift-evolution/blob/master/proposals/0252-keypath-dynamic-member-lookup.md>
[SE-0253]: <https://github.com/apple/swift-evolution/blob/master/proposals/0253-callable.md>
[SE-0254]: <https://github.com/apple/swift-evolution/blob/master/proposals/0254-static-subscripts.md>

[SR-106]: <https://bugs.swift.org/browse/SR-106>
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