POC for .NET interface adapters

See #75

Samples/Beyond.NET.Sample.Managed/Source/InterfaceTests.cs

@@ -1,10 +1,28 @@
 namespace Beyond.NET.Sample;
 
+// This is declared by the user.
 public interface IInterface1
 {
     void MethodInIInterface1();
 }
 
+// This should be auto-generated to allow Swift to provide implementations for .NET interfaces.
+public class IInterface1_DelegateAdapter : IInterface1
+{
+    public delegate void MethodInIInterface1_Delegate();
+    private MethodInIInterface1_Delegate _MethodInIInterface1_Adapter;
+
+    public IInterface1_DelegateAdapter(MethodInIInterface1_Delegate methodInIInterface1_Adapter)
+    {
+        _MethodInIInterface1_Adapter = methodInIInterface1_Adapter;
+    }
+
+    public void MethodInIInterface1()
+    {
+        _MethodInIInterface1_Adapter();
+    }
+}
+
 public interface IInterface2
 {
     int PropertyInIInterface2 { get; set; }
@@ -45,6 +63,7 @@ public void MethodInIInterface3()
     }
 }
 
+// This is declared by the user.
 public class TypeThatUsesInterfaces
 {
     public void CallMethod1InIInterface1(IInterface1 interface1)

Samples/Beyond.NET.Sample.Swift/Tests/TestClasses/InterfaceTests.swift

@@ -27,4 +27,22 @@ final class InterfaceTests: XCTestCase {
         XCTAssertEqual(val, retVal)
         try typeThatUsesInterfaces.callMethod1InIInterface3(interface3)
     }
+
+    func testInterfaceAdapter() throws {
+        let typeThatUsesInterfaces = try Beyond_NET_Sample_TypeThatUsesInterfaces()
+
+        let methodInIInterface1CalledExpectation = expectation(description: "IInterface1.MethodInIInterface1 called in Swift")
+
+        // Compiler ensures we provide all interface requirements.
+        // Ideally, we'd have an auto-generated Swift wrapper type that sets up all the delegate -> closure callbacks and allows us to just override the members required to satisfy the interface/protocol requirements.
+        let interface1Adapter = try Beyond_NET_Sample_IInterface1_DelegateAdapter(.init({
+            print("IInterface1.MethodInIInterface1 called in Swift")
+
+            methodInIInterface1CalledExpectation.fulfill()
+        }))
+
+        try typeThatUsesInterfaces.callMethod1InIInterface1(try interface1Adapter.castTo())
+
+        wait(for: [ methodInIInterface1CalledExpectation ])
+    }
 }

Samples/Generated/Generated_C.h

@@ -1,5 +1,5 @@
-// Number of generated types: 1813
-// Number of generated members: 6096
+// Number of generated types: 1815
+// Number of generated members: 6102
 
 #pragma mark - BEGIN Header
 #ifndef TypeDefinitions_h
@@ -5622,6 +5622,8 @@ typedef void* Beyond_NET_Sample_IndexerTests_t;
 
 typedef void* Beyond_NET_Sample_IInterface1_t;
 
+typedef void* Beyond_NET_Sample_IInterface1_DelegateAdapter_t;
+
 typedef void* Beyond_NET_Sample_IInterface2_t;
 
 typedef void* Beyond_NET_Sample_IInterface3_t;
@@ -5953,6 +5955,14 @@ typedef void (*Beyond_NET_Sample_EventTests_ValueChangedDelegate_CFunction_t)(
 );
 
 
+typedef void* Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_t;
+typedef void (*Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_CDestructorFunction_t)(void* context);
+
+typedef void (*Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_CFunction_t)(
+	void* context
+);
+
+
 typedef void* Beyond_NET_Sample_Person_NumberOfChildrenChangedDelegate_t;
 typedef void (*Beyond_NET_Sample_Person_NumberOfChildrenChangedDelegate_CDestructorFunction_t)(void* context);
 
@@ -45718,6 +45728,31 @@ Beyond_NET_Sample_IInterface1_Destroy(
 
 #pragma mark - END APIs of Beyond.NET.Sample.IInterface1
 
+#pragma mark - BEGIN APIs of Beyond.NET.Sample.IInterface1_DelegateAdapter
+void /* System.Void */
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1(
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_t _Nullable /* Beyond.NET.Sample.IInterface1_DelegateAdapter */ self,
+	System_Exception_t _Nullable* _Nullable /* System.Exception */ outException
+);
+
+Beyond_NET_Sample_IInterface1_DelegateAdapter_t _Nonnull /* Beyond.NET.Sample.IInterface1_DelegateAdapter */
+Beyond_NET_Sample_IInterface1_DelegateAdapter_Create(
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_t _Nonnull /* Beyond.NET.Sample.IInterface1_DelegateAdapter.MethodInIInterface1_Delegate */ methodInIInterface1_Adapter,
+	System_Exception_t _Nullable* _Nullable /* System.Exception */ outException
+);
+
+System_Type_t _Nonnull /* System.Type */
+Beyond_NET_Sample_IInterface1_DelegateAdapter_TypeOf(
+	void
+);
+
+void /* System.Void */
+Beyond_NET_Sample_IInterface1_DelegateAdapter_Destroy(
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_t _Nullable /* Beyond.NET.Sample.IInterface1_DelegateAdapter */ self
+);
+
+#pragma mark - END APIs of Beyond.NET.Sample.IInterface1_DelegateAdapter
+
 #pragma mark - BEGIN APIs of Beyond.NET.Sample.IInterface2
 int32_t /* System.Int32 */
 Beyond_NET_Sample_IInterface2_PropertyInIInterface2_Get(
@@ -51016,6 +51051,46 @@ Beyond_NET_Sample_EventTests_ValueChangedDelegate_Destroy(
 
 #pragma mark - END APIs of Beyond.NET.Sample.EventTests.ValueChangedDelegate
 
+#pragma mark - BEGIN APIs of Beyond.NET.Sample.IInterface1_DelegateAdapter.MethodInIInterface1_Delegate
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_t _Nonnull /* Beyond.NET.Sample.IInterface1_DelegateAdapter.MethodInIInterface1_Delegate */
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_Create(
+	const void* context,
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_CFunction_t function,
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_CDestructorFunction_t destructorFunction
+);
+
+void
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_Invoke(
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_t /* Beyond.NET.Sample.IInterface1_DelegateAdapter.MethodInIInterface1_Delegate */ self, System_Exception_t* /* System.Exception */ outException
+);
+
+const void*
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_Context_Get(
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_t /* Beyond.NET.Sample.IInterface1_DelegateAdapter.MethodInIInterface1_Delegate */ self
+);
+
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_CFunction_t
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_CFunction_Get(
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_t /* Beyond.NET.Sample.IInterface1_DelegateAdapter.MethodInIInterface1_Delegate */ self
+);
+
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_CDestructorFunction_t
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_CDestructorFunction_Get(
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_t /* Beyond.NET.Sample.IInterface1_DelegateAdapter.MethodInIInterface1_Delegate */ self
+);
+
+System_Type_t _Nonnull /* System.Type */
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_TypeOf(
+	void
+);
+
+void /* System.Void */
+Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_Destroy(
+	Beyond_NET_Sample_IInterface1_DelegateAdapter_MethodInIInterface1_Delegate_t _Nullable /* Beyond.NET.Sample.IInterface1_DelegateAdapter.MethodInIInterface1_Delegate */ self
+);
+
+#pragma mark - END APIs of Beyond.NET.Sample.IInterface1_DelegateAdapter.MethodInIInterface1_Delegate
+
 #pragma mark - BEGIN APIs of Beyond.NET.Sample.Person.NumberOfChildrenChangedDelegate
 Beyond_NET_Sample_Person_NumberOfChildrenChangedDelegate_t _Nonnull /* Beyond.NET.Sample.Person.NumberOfChildrenChangedDelegate */
 Beyond_NET_Sample_Person_NumberOfChildrenChangedDelegate_Create(