Fix anonymous member name colliding with enclosing type name (#1425)

* Fix anonymous member name colliding with enclosing type name

src/Generator/Passes/CleanInvalidDeclNamesPass.cs

@@ -146,7 +146,14 @@ namespace CppSharp.Passes
         {
             var anonymousDecls = decls.Where(p => string.IsNullOrEmpty(p.Name)).ToList();
             for (int i = 0; i < anonymousDecls.Count; i++)
-                anonymousDecls[i].Name = $"_{i}";
+            {
+                var anonymousDecl = anonymousDecls[i];
+
+                if (anonymousDecl.Namespace != null && anonymousDecl.Namespace.Name == anonymousDecl.Name)
+                    anonymousDecl.Name = $"__{i}";
+                else
+                    anonymousDecl.Name = $"_{i}";
+            }
         }
     }
 }

tests/CSharp/CSharp.Tests.cs

@@ -1429,4 +1429,10 @@ public unsafe class CSharpTests : GeneratorTestFixture
     {
         Assert.That(CSharp.CSharp.TakeTypemapTypedefParam(false), Is.False);
     }
+
+    [Test]
+    public void TestAnonymousMemberNameCollision()
+    {
+        StringAssert.EndsWith(nameof(CSharp.TestAnonymousMemberNameCollision._0.__0), "__0");
+    }
 }

tests/CSharp/CSharp.h

@@ -6,6 +6,7 @@
 #include <limits>
 #include <string>
 #include "AnotherUnit.h"
+#include "ExcludedUnit.hpp"
 #include "CSharpTemplates.h"
 
 class DLL_API Foo
@@ -1401,3 +1402,6 @@ struct {
 typedef int boolean_t;
 DLL_API boolean_t takeTypemapTypedefParam(boolean_t b);
 
+class DLL_API TestAnonymousMemberNameCollision : public ClassUsingUnion {
+
+};

tests/CSharp/ExcludedUnit.hpp

@@ -0,0 +1,11 @@
+#pragma once
+
+class ClassUsingUnion {
+public:
+	union {
+		float arr[2];
+		struct {
+			float a, b;
+		};
+	};
+};