Fixed the generation of copy ctors when mutiple inheritance is involved.

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

src/Generator/AST/Utils.cs

@@ -49,11 +49,14 @@ namespace CppSharp.AST
                 while (baseClass != null && baseClass.HasBaseClass)
                 {
                     baseClass = baseClass.BaseClass;
-                    var copyConstructor = baseClass.Methods.FirstOrDefault(m => m.IsCopyConstructor);
-                    if (copyConstructor == null
-                        || copyConstructor.Access == AccessSpecifier.Private
-                        || !copyConstructor.IsDeclared)
-                        return true;
+                    if (!baseClass.IsInterface)
+                    {
+                        var copyConstructor = baseClass.Methods.FirstOrDefault(m => m.IsCopyConstructor);
+                        if (copyConstructor == null
+                            || copyConstructor.Access == AccessSpecifier.Private
+                            || !copyConstructor.IsDeclared)
+                            return true;   
+                    }
                 }
             }
 

tests/CSharpTemp/CSharpTemp.Tests.cs

@@ -156,4 +156,19 @@ public class CSharpTempTests : GeneratorTestFixture
     {
         Assert.AreEqual(TestFlag.Flag2, new ComplexType().ReturnsQFlags);
     }
+
+    [Test]
+    public void TestCopyCtor()
+    {
+        Qux q1 = new Qux();
+        for (int i = 0; i < q1.Array.Length; i++)
+        {
+            q1.Array[i] = i;
+        }
+        Qux q2 = new Qux(q1);
+        for (int i = 0; i < q2.Array.Length; i++)
+        {
+            Assert.AreEqual(q1.Array[i], q2.Array[i]);
+        }
+    }
 }