Infix operator version

.swiftpm/xcode/xcshareddata/xcschemes/Wrap.xcscheme

@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1330"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "Wrap"
+               BuildableName = "Wrap"
+               BlueprintName = "Wrap"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "NO"
+            buildForArchiving = "NO"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "WrapTests"
+               BuildableName = "WrapTests"
+               BlueprintName = "WrapTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "WrapTests"
+               BuildableName = "WrapTests"
+               BlueprintName = "WrapTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "Wrap"
+            BuildableName = "Wrap"
+            BlueprintName = "Wrap"
+            ReferencedContainer = "container:">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Package.swift

@@ -8,6 +8,7 @@ let package = Package(
   ],
   targets: [
     .target(name: "Wrap", dependencies: []),
+    .testTarget(name: "WrapTests", dependencies: ["Wrap"])
   ],
   swiftLanguageVersions: [.v5]
 )

Sources/Wrap/Wrap.swift

@@ -1,47 +1,47 @@
-
-postfix operator &>
-
-public postfix func &> <T>(argument: T) -> Wrap<T> {
-  .init(argument)
+precedencegroup WrapPrecedence {
+  associativity: left
 }
 
-public struct Wrap<Value> {
-
-  public let value: Value
+infix operator &>: WrapPrecedence
+infix operator <&: WrapPrecedence
 
-  public init(_ value: Value) {
-    self.value = value
-  }
-
+public func <& <T, O>(lhs: inout T, modifier: WrapModifier<T, O>) -> O {
+  modifier.modify(&lhs)
 }
 
-public func modify<Value>(_ value: inout Value, _ modifier: (inout Value) -> Void) {
-  modifier(&value)
+@discardableResult
+public func &> <T, O>(lhs: T, applier: WrapApplier<T, O>) -> O {
+  applier.apply(lhs)
 }
 
-extension Wrap {
-
-  public func map<U>(_ transform: (Value) throws -> U) rethrows -> U {
-    try transform(value)
-  }
-
-  @discardableResult
-  public func `do`(_ applier: (Value) throws -> Void) rethrows -> Value where Value : AnyObject {
-    try applier(value)
-    return value
+public struct WrapModifier<Input, Output> {
+
+  public let modify: (inout Input) -> Output
+
+  public init(_ modify: @escaping (inout Input) -> Output) {
+    self.modify = modify
   }
 
-  public func modify(_ modifier: (inout Value) throws -> Void) rethrows -> Value {
-    var v = value
-    try modifier(&v)
-    return v
+  public static func modify(_ modify: @escaping (inout Input) -> Void) -> WrapModifier<Input, Void> {
+    return .init {
+      modify(&$0)
+    }
   }
+
+}
 
-  public func filter(_ filter: (Value) -> Bool) -> Value? {
-    guard filter(value) else {
-      return nil
+public struct WrapApplier<Input, Output> {
+
+  public let apply: (Input) -> Output
+
+  public init(_ apply: @escaping (Input) -> Output) {
+    self.apply = apply
+  }
+
+  public static func `do`(_ applier: @escaping (Input) -> Void) -> WrapApplier<Input, Input> {
+    return .init {
+      applier($0)
+      return $0
     }
-    return value
   }
-
 }

Tests/WrapTests/Tests.swift

@@ -0,0 +1,23 @@
+import XCTest
+
+import Wrap
+
+final class Tests: XCTestCase {
+
+  func testApplier() {
+
+    "1" &> .do {
+      XCTAssertEqual($0, "1")
+    }
+
+    var text = ""
+
+    text <& .modify {
+      $0 = "muuk"
+    }
+
+    XCTAssertEqual(text, "muuk")
+
+  }
+
+}