From 1f651932120a82754b7f2036618a8b7d3a67e49d Mon Sep 17 00:00:00 2001
From: Caleb Kleveter <caleb.kleveter@gmail.com>
Date: Wed, 22 Jan 2020 12:27:35 -0600
Subject: [PATCH] Only add Combine support if module can be imported

---
 .../SwiftCoroutine/Combine/CoFuture+Combine.swift |  2 ++
 .../Combine/CoPromise+Combine.swift               |  2 ++
 .../SwiftCoroutine/Combine/CoSubscription.swift   |  2 ++
 .../Combine/Dispatcher+Scheduler.swift            |  2 ++
 .../Combine/Publisher+Extensions.swift            |  2 ++
 .../SwiftCoroutine/Protocols/CoCancellable.swift  | 15 ++++++++++++++-
 Tests/SwiftCoroutineTests/CombineTests.swift      |  2 ++
 7 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/Sources/SwiftCoroutine/Combine/CoFuture+Combine.swift b/Sources/SwiftCoroutine/Combine/CoFuture+Combine.swift
index a656b34..d0965d7 100644
--- a/Sources/SwiftCoroutine/Combine/CoFuture+Combine.swift
+++ b/Sources/SwiftCoroutine/Combine/CoFuture+Combine.swift
@@ -6,6 +6,7 @@
 //  Copyright © 2019 Alex Belozierov. All rights reserved.
 //
 
+#if canImport(Combine)
 import Combine
 
 @available(OSX 10.15, iOS 13.0, *)
@@ -35,3 +36,4 @@ extension Subscriber {
     }
     
 }
+#endif
diff --git a/Sources/SwiftCoroutine/Combine/CoPromise+Combine.swift b/Sources/SwiftCoroutine/Combine/CoPromise+Combine.swift
index bba6333..104c379 100644
--- a/Sources/SwiftCoroutine/Combine/CoPromise+Combine.swift
+++ b/Sources/SwiftCoroutine/Combine/CoPromise+Combine.swift
@@ -6,6 +6,7 @@
 //  Copyright © 2019 Alex Belozierov. All rights reserved.
 //
 
+#if canImport(Combine)
 import Combine
 
 @available(OSX 10.15, iOS 13.0, *)
@@ -23,3 +24,4 @@ extension CoPromise: Subject {
     }
     
 }
+#endif
diff --git a/Sources/SwiftCoroutine/Combine/CoSubscription.swift b/Sources/SwiftCoroutine/Combine/CoSubscription.swift
index fd74be3..04b0a86 100644
--- a/Sources/SwiftCoroutine/Combine/CoSubscription.swift
+++ b/Sources/SwiftCoroutine/Combine/CoSubscription.swift
@@ -6,6 +6,7 @@
 //  Copyright © 2019 Alex Belozierov. All rights reserved.
 //
 
+#if canImport(Combine)
 import Combine
 
 @available(OSX 10.15, iOS 13.0, *)
@@ -38,3 +39,4 @@ extension CoSubscription: Hashable {
     }
     
 }
+#endif
diff --git a/Sources/SwiftCoroutine/Combine/Dispatcher+Scheduler.swift b/Sources/SwiftCoroutine/Combine/Dispatcher+Scheduler.swift
index d070299..dd4d3d0 100644
--- a/Sources/SwiftCoroutine/Combine/Dispatcher+Scheduler.swift
+++ b/Sources/SwiftCoroutine/Combine/Dispatcher+Scheduler.swift
@@ -6,6 +6,7 @@
 //  Copyright © 2019 Alex Belozierov. All rights reserved.
 //
 
+#if canImport(Combine)
 import Combine
 
 @available(OSX 10.15, iOS 13.0, *)
@@ -20,3 +21,4 @@ extension Coroutine.Dispatcher {
     }
     
 }
+#endif
diff --git a/Sources/SwiftCoroutine/Combine/Publisher+Extensions.swift b/Sources/SwiftCoroutine/Combine/Publisher+Extensions.swift
index 71467ff..9f0a714 100644
--- a/Sources/SwiftCoroutine/Combine/Publisher+Extensions.swift
+++ b/Sources/SwiftCoroutine/Combine/Publisher+Extensions.swift
@@ -6,6 +6,7 @@
 //  Copyright © 2019 Alex Belozierov. All rights reserved.
 //
 
+#if canImport(Combine)
 import Combine
 import Dispatch
 
@@ -26,3 +27,4 @@ extension Publisher {
     }
     
 }
+#endif
diff --git a/Sources/SwiftCoroutine/Protocols/CoCancellable.swift b/Sources/SwiftCoroutine/Protocols/CoCancellable.swift
index ae8b6af..9854f9f 100644
--- a/Sources/SwiftCoroutine/Protocols/CoCancellable.swift
+++ b/Sources/SwiftCoroutine/Protocols/CoCancellable.swift
@@ -6,6 +6,8 @@
 //  Copyright © 2020 Alex Belozierov. All rights reserved.
 //
 
+#if !canImport(Combine)
+
 import Combine
 
 public protocol CoCancellable: Cancellable, Hashable {
@@ -15,6 +17,17 @@ public protocol CoCancellable: Cancellable, Hashable {
     
 }
 
+#else
+
+public protocol CoCancellable: Hashable {
+
+    func cancel()
+    func cancelUpstream()
+
+}
+
+#endif
+
 extension CoCancellable where Self: AnyObject {
     
     @inlinable public var anyCoCancellable: AnyCoCancellable {
@@ -47,5 +60,5 @@ final public class AnyCoCancellable: CoCancellable {
     @inlinable public func hash(into hasher: inout Hasher) {
         ObjectIdentifier(self).hash(into: &hasher)
     }
-    
+
 }
diff --git a/Tests/SwiftCoroutineTests/CombineTests.swift b/Tests/SwiftCoroutineTests/CombineTests.swift
index 4f44ec9..20a3394 100644
--- a/Tests/SwiftCoroutineTests/CombineTests.swift
+++ b/Tests/SwiftCoroutineTests/CombineTests.swift
@@ -6,6 +6,7 @@
 //  Copyright © 2019 Alex Belozierov. All rights reserved.
 //
 
+#if canImport(Combine)
 import XCTest
 import Combine
 import SwiftCoroutine
@@ -35,3 +36,4 @@ class CombineTests: XCTestCase {
     }
     
 }
+#endif