Added C# marshalling of parameters of type array of objects.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -862,12 +862,15 @@ namespace CppSharp.Generators.CSharp
 
             var intermediateArray = $"__{Context.Parameter.Name}";
             var intermediateArrayType = typePrinter.PrintNative(arrayType);
-            const string intPtrType = CSharpTypePrinter.IntPtrType;
+            var intPtrZero = $"{CSharpTypePrinter.IntPtrType}.Zero";
 
             Context.Before.WriteLine($"{intermediateArrayType}[] {intermediateArray};");
 
             Context.Before.WriteLine($"if (ReferenceEquals({Context.Parameter.Name}, null))");
-            Context.Before.WriteLineIndent($"{intermediateArray} = new[] {{ {intPtrType}.Zero }};");
+            if (arrayType.IsAddress())
+                Context.Before.WriteLineIndent($"{intermediateArray} = new[] {{ {intPtrZero} }};");
+            else
+                Context.Before.WriteLineIndent($"{intermediateArray} = new[] {{ new {intermediateArrayType}() }};");
             Context.Before.WriteLine("else");
 
             Context.Before.WriteStartBraceIndent();
@@ -878,8 +881,13 @@ namespace CppSharp.Generators.CSharp
             Context.Before.WriteStartBraceIndent();
             const string element = "__element";
             Context.Before.WriteLine($"var {element} = {Context.Parameter.Name}[i];");
-            Context.Before.WriteLine($@"{intermediateArray}[i] = ReferenceEquals({
+            if (arrayType.IsAddress())
-                element}, null) ? {intPtrType}.Zero : {element}.{Helpers.InstanceIdentifier};");
+                Context.Before.WriteLine($@"{intermediateArray}[i] = ReferenceEquals({
+                    element}, null) ? {intPtrZero} : {element}.{Helpers.InstanceIdentifier};");
+            else
+                Context.Before.WriteLine($@"{intermediateArray}[i] = ReferenceEquals({
+                    element}, null) ? new {intermediateArrayType}() : *({
+                    intermediateArrayType}*) {element}.{Helpers.InstanceIdentifier};");
             Context.Before.WriteCloseBraceIndent();
 
             Context.Before.WriteCloseBraceIndent();

tests/CSharp/CSharp.Tests.cs

@@ -1063,9 +1063,10 @@ public unsafe class CSharpTests : GeneratorTestFixture
     [Test]
     public void TestArrayParams()
     {
-        Foo[] foos = { new Foo { A = 2 }, new Foo { A = 5 } };
+        Foo[] pointers = { new Foo { A = 2 }, new Foo { A = 5 } };
         int[] ints = { 6, 7 };
-        Assert.That(CSharp.CSharp.TakeArrays(foos, ints), Is.EqualTo(20));
+        Foo[] values = { new Foo { A = 10 }, new Foo { A = 20 } };
+        Assert.That(CSharp.CSharp.TakeArrays(pointers, ints, values), Is.EqualTo(50));
     }
 
     private class OverrideVirtualTemplate : VirtualTemplate<int>

tests/CSharp/CSharp.cpp

@@ -1392,7 +1392,9 @@ void InlineNamespace::FunctionInsideInlineNamespace()
 {
 }
 
-int takeArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[])
+int takeArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[], Foo arrayOfObjects[])
 {
-    return arrayOfPointersToObjects[0]->A + arrayOfPointersToObjects[1]->A + arrayOfPrimitives[0] + arrayOfPrimitives[1];
+    return arrayOfPointersToObjects[0]->A + arrayOfPointersToObjects[1]->A +
+           arrayOfPrimitives[0] + arrayOfPrimitives[1] +
+           arrayOfObjects[0].A + arrayOfObjects[1].A;
 }

tests/CSharp/CSharp.h

@@ -1237,4 +1237,4 @@ inline namespace InlineNamespace
     DLL_API void FunctionInsideInlineNamespace();
 }
 
-DLL_API int takeArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[]);
+DLL_API int takeArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[], Foo arrayOfObjects[]);