Why unary ++ operator has been deprecated?

Martin_Delille · July 4, 2016, 2:32pm

Everything is in the title.

Erica_Sadun · July 4, 2016, 2:45pm

Everything to explain why should be in the formal proposal:

apple/swift-evolution/blob/main/proposals/0004-remove-pre-post-inc-decrement.md

# Remove the `++` and `--` operators

* Proposal: [SE-0004](0004-remove-pre-post-inc-decrement.md)
* Author: [Chris Lattner](https://github.com/lattner)
* Status: **Implemented (Swift 3)**
* Implementation: [apple/swift@8e12008](https://github.com/apple/swift/commit/8e12008d2b34a605f8766310f53d5668f3d50955)

## Introduction

The increment/decrement operators in Swift were added very early in the
development of Swift, as a carry-over from C.  These were added without much
consideration, and haven't been thought about much since then.  This document
provides a fresh look at them, and ultimately recommends we just remove them
entirely, since they are confusing and not carrying their weight.

As a quick refresher, there are four operators in this family:

```swift
let a = ++x  // pre-increment  - returns input value after mutation
let b = x++  // post-increment - returns copy of input value before mutation

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On Jul 4, 2016, at 8:32 AM, Martin Delille via swift-users <swift-users@swift.org> wrote:

Everything is in the title.