Added '<>' (swap) operator

Author: iDonJose

Playground.playground/Pages/Summary.xcplaygroundpage/Contents.swift

@@ -20,6 +20,7 @@
  **Property Operators**
  - [`ping()`](Ping) : Pings a MutableProperty
  - [`toggle()`](Toggle) : Toggles a MutableProperty of Bool
+ - [`<> (swap)`](Swap) : Swaps a new value
 
  **Signal Operators**
  - [`combine(withLatest:)`](CombineWithLatest) : Combines value and latest value of another Signal

Playground.playground/Pages/Swap.xcplaygroundpage/Contents.swift

@@ -0,0 +1,31 @@
+/*:
+ ## `<> (swap)`
+ Swaps new value
+ */
+
+import ReactiveSwift
+import ReactiveSwifty
+
+
+/// Atomic
+let atomic = Atomic<Bool>(false)
+
+atomic <> true
+atomic <> true
+
+
+/// MutableProperty
+let property = MutableProperty<Bool>(false)
+
+property <> true
+property <> true
+
+
+/// MutableActionProperty
+let actionProperty = MutableActionProperty<Bool>()
+
+actionProperty <> true
+actionProperty <> true
+
+
+//: < [Summary](Summary) | [Next](@next) >

Playground.playground/contents.xcplayground

@@ -6,6 +6,7 @@
         <page name='MutableActionProperty'/>
         <page name='Ping'/>
         <page name='Toggle'/>
+        <page name='Swap'/>
         <page name='CombineWithLatest'/>
         <page name='ConcatMap'/>
         <page name='FilterWithLatest'/>

ReactiveSwifty.xcodeproj/project.pbxproj

@@ -42,6 +42,7 @@
 		82AB2B67219E4E6000987CCB /* CombineWith.swift in Sources */ = {isa = PBXBuildFile; fileRef = 82AB2B66219E4E6000987CCB /* CombineWith.swift */; };
 		82AB2B69219E5AA200987CCB /* SkipError.swift in Sources */ = {isa = PBXBuildFile; fileRef = 82AB2B68219E5AA200987CCB /* SkipError.swift */; };
 		82AB2B6B219E5B8900987CCB /* SkipError_Spec.swift in Sources */ = {isa = PBXBuildFile; fileRef = 82AB2B6A219E5B8900987CCB /* SkipError_Spec.swift */; };
+		82C6B1D1222738AC00413DC3 /* Swap.swift in Sources */ = {isa = PBXBuildFile; fileRef = 82C6B1D0222738AC00413DC3 /* Swap.swift */; };
 		82DEA54F21FD0BBA00CA6514 /* MutableActionProperty.swift in Sources */ = {isa = PBXBuildFile; fileRef = 82DEA54E21FD0BBA00CA6514 /* MutableActionProperty.swift */; };
 		915B672D101EEED88AD82137 /* Pods_ReactiveSwifty_iOSTests.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = B9CFEA987BFADCE581878ED1 /* Pods_ReactiveSwifty_iOSTests.framework */; };
 /* End PBXBuildFile section */
@@ -106,6 +107,7 @@
 		82AB2B66219E4E6000987CCB /* CombineWith.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CombineWith.swift; sourceTree = "<group>"; };
 		82AB2B68219E5AA200987CCB /* SkipError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SkipError.swift; sourceTree = "<group>"; };
 		82AB2B6A219E5B8900987CCB /* SkipError_Spec.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SkipError_Spec.swift; sourceTree = "<group>"; };
+		82C6B1D0222738AC00413DC3 /* Swap.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Swap.swift; sourceTree = "<group>"; };
 		82DEA54E21FD0BBA00CA6514 /* MutableActionProperty.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MutableActionProperty.swift; sourceTree = "<group>"; };
 		98031A09842BCE0AF7DB96FE /* Pods-ReactiveSwifty-iOSTests.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-ReactiveSwifty-iOSTests.release.xcconfig"; path = "Pods/Target Support Files/Pods-ReactiveSwifty-iOSTests/Pods-ReactiveSwifty-iOSTests.release.xcconfig"; sourceTree = "<group>"; };
 		B9CFEA987BFADCE581878ED1 /* Pods_ReactiveSwifty_iOSTests.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_ReactiveSwifty_iOSTests.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -239,6 +241,7 @@
 			children = (
 				825DCF76219E5EFD00B1F103 /* Ping.swift */,
 				8267FF4721979B01000F61DA /* Toggle.swift */,
+				82C6B1D0222738AC00413DC3 /* Swap.swift */,
 			);
 			path = "Property Operators";
 			sourceTree = "<group>";
@@ -495,6 +498,7 @@
 				82AB2B60219E245F00987CCB /* SpaceOut.swift in Sources */,
 				8267FF3B21977759000F61DA /* Errors.swift in Sources */,
 				825DCF7D219E654800B1F103 /* Values.swift in Sources */,
+				82C6B1D1222738AC00413DC3 /* Swap.swift in Sources */,
 				8267FF2A2197597F000F61DA /* LifetimeProvider.swift in Sources */,
 				8267FF432197934B000F61DA /* Completes.swift in Sources */,
 				8267FF352197736D000F61DA /* ConcatMap.swift in Sources */,

Sources/Property Operators/Swap.swift

@@ -0,0 +1,32 @@
+//
+//  Swap.swift
+//  ReactiveSwifty-iOS
+//
+//  Created by José Donor on 27/02/2019.
+//  Copyright © 2019 iDonJose. All rights reserved.
+//
+
+import ReactiveSwift
+
+
+
+infix operator <>: AssignmentPrecedence
+
+
+/// Swaps new value
+@discardableResult
+public func <> <Value>(property: Atomic<Value>, value: Value) -> Value {
+    return property.swap(value)
+}
+
+/// Swaps new value
+@discardableResult
+public func <> <Value>(property: MutableProperty<Value>, value: Value) -> Value {
+    return property.swap(value)
+}
+
+/// Swaps new value
+@discardableResult
+public func <> <Value>(property: MutableActionProperty<Value>, value: Value) -> Value? {
+    return property.swap(value)
+}