Ensure protected nested types are accessible with multiple inheritance

Fixes #594.

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

Author: ddobrev

src/Generator/Driver.cs

@@ -251,6 +251,7 @@ public void SetupPasses(ILibrary library)
             TranslationUnitPasses.AddPass(new FieldToPropertyPass());
             TranslationUnitPasses.AddPass(new CheckIgnoredDeclsPass());
             TranslationUnitPasses.AddPass(new CheckFlagEnumsPass());
+            TranslationUnitPasses.AddPass(new MakeProtectedNestedTypesPublicPass());
 
             if (Options.IsCSharpGenerator)
             {

src/Generator/Passes/MakeProtectedNestedTypesPublicPass.cs

@@ -0,0 +1,37 @@
+using System.Collections.Generic;
+using System.Linq;
+using CppSharp.AST;
+
+namespace CppSharp.Passes
+{
+    public class MakeProtectedNestedTypesPublicPass : TranslationUnitPass
+    {
+        public MakeProtectedNestedTypesPublicPass()
+        {
+            VisitOptions.VisitClassBases = false;
+            VisitOptions.VisitClassFields = false;
+            VisitOptions.VisitClassTemplateSpecializations = false;
+            VisitOptions.VisitEventParameters = false;
+            VisitOptions.VisitFunctionParameters = false;
+            VisitOptions.VisitFunctionReturnType = false;
+            VisitOptions.VisitNamespaceEnums = false;
+            VisitOptions.VisitNamespaceEvents = false;
+            VisitOptions.VisitNamespaceTemplates = false;
+            VisitOptions.VisitNamespaceTypedefs = false;
+            VisitOptions.VisitNamespaceVariables = false;
+            VisitOptions.VisitTemplateArguments = false;
+        }
+
+        public override bool VisitClassDecl(Class @class)
+        {
+            if (!base.VisitClassDecl(@class))
+                return false;
+
+            (from d in ((IEnumerable<Declaration>) @class.Classes).Concat(@class.Enums)
+             where d.Access == AccessSpecifier.Protected
+             select d).All(d => { d.Access = AccessSpecifier.Public; return true; });
+
+            return true;
+        }
+    }
+}

tests/CSharp/CSharp.Tests.cs

@@ -144,7 +144,7 @@ public void TestMultipleInheritance()
             Assert.That(baz.FarAwayFunc, Is.EqualTo(20));
             Assert.That(baz.TakesQux(baz), Is.EqualTo(20));
             Assert.That(baz.ReturnQux().FarAwayFunc, Is.EqualTo(20));
-            baz.SetMethod(1);
+            baz.SetMethod(Bar.ProtectedNestedEnum.Item1);
             Assert.That(baz.P, Is.EqualTo(5));
             baz.PublicDouble = 1.5;
             Assert.That(baz.PublicDouble, Is.EqualTo(1.5));

tests/CSharp/CSharp.cpp

@@ -312,7 +312,7 @@ Qux Baz::returnQux()
     return Qux();
 }
 
-void Baz::setMethod(int value)
+void Baz::setMethod(ProtectedNestedEnum value)
 {
 }
 

tests/CSharp/CSharp.h

@@ -116,6 +116,13 @@ class DLL_API Bar : public Qux
         double publicDouble;
     };
 
+protected:
+    enum class ProtectedNestedEnum
+    {
+        Item1,
+        Item2
+    };
+
 private:
     int index;
     Foo m_foo;
@@ -149,7 +156,7 @@ class DLL_API Baz : public Foo, public Bar
 
     int takesQux(const Qux& qux);
     Qux returnQux();
-    void setMethod(int value);
+    void setMethod(ProtectedNestedEnum value);
 
     typedef bool (*FunctionTypedef)(const void *);
     FunctionTypedef functionTypedef;