Generate valid C++ for conversion operators in name-spaced classes

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

src/Generator/Generators/C/CppTypePrinter.cs

@@ -571,50 +571,54 @@ namespace CppSharp.Generators.C
 
         public override TypePrinterResult VisitFunctionDecl(Function function)
         {
-            return VisitDeclaration(function);
-        }
-
-        public override TypePrinterResult VisitMethodDecl(Method method)
-        {
-            // HACK: this should never happen but there's an inexplicable crash
-            // with the 32-bit Windows CI - needs investigation.
-            var functionType = method.FunctionType.Type.Desugar() as FunctionType;
-            if (functionType == null)
-                return string.Empty;
-
-            var @return = method.IsConstructor || method.IsDestructor ||
-                method.OperatorKind == CXXOperatorKind.Conversion ||
-                method.OperatorKind == CXXOperatorKind.ExplicitConversion ?
-                new TypePrinterResult() : method.OriginalReturnType.Visit(this);
-
             string @class;
             switch (MethodScopeKind)
             {
                 case TypePrintScopeKind.Qualified:
-                    @class = $"{method.Namespace.Visit(this)}::";
+                    @class = $"{function.Namespace.Visit(this)}::";
                     break;
                 case TypePrintScopeKind.GlobalQualified:
-                    @class = $"::{method.Namespace.Visit(this)}::";
+                    @class = $"::{function.Namespace.Visit(this)}::";
                     break;
                 default:
                     @class = string.Empty;
                     break;
             }
 
-            var @params = string.Join(", ", method.Parameters.Select(p => p.Visit(this)));
-            var @const = method.IsConst ? " const" : string.Empty;
-            var name = method.OperatorKind == CXXOperatorKind.Conversion ||
-                method.OperatorKind == CXXOperatorKind.ExplicitConversion ?
-                $"operator {method.OriginalReturnType.Visit(this)}" :
-                method.OriginalName;
-
+            var @params = string.Join(", ", function.Parameters.Select(p => p.Visit(this)));
+            var @const = function is Method method && method.IsConst ? " const" : string.Empty;
+            var name = function.OperatorKind == CXXOperatorKind.Conversion ||
+                function.OperatorKind == CXXOperatorKind.ExplicitConversion ?
+                $"operator {function.OriginalReturnType.Visit(this)}" :
+                function.OriginalName;
+
+            FunctionType functionType;
+            CppSharp.AST.Type desugared = function.FunctionType.Type.Desugar();
+            if (!desugared.IsPointerTo(out functionType))
+                functionType = (FunctionType) desugared;
             string exceptionType = Print(functionType.ExceptionSpecType);
 
+            var @return = function.OriginalReturnType.Visit(this);
             if (!string.IsNullOrEmpty(@return.Type))
                 @return.NamePrefix.Append(' ');
-            @return.NamePrefix.Append(@class).Append(name).Append('(').Append(@params).Append(')');
-            @return.NameSuffix.Append(@const).Append(exceptionType);
-            return @return.ToString();
+            @return.Name = @class + name;
+            @return.NameSuffix.Append('(').Append(@params).Append(')').Append(@const).Append(exceptionType);
+            return @return;
+        }
+
+        public override TypePrinterResult VisitMethodDecl(Method method)
+        {
+            var @return = VisitFunctionDecl(method);
+
+            if (method.IsConstructor || method.IsDestructor ||
+                method.OperatorKind == CXXOperatorKind.Conversion ||
+                method.OperatorKind == CXXOperatorKind.ExplicitConversion)
+            {
+                @return.Type = string.Empty;
+                @return.NamePrefix.Clear();
+            }
+
+            return @return;
         }
 
         public override TypePrinterResult VisitParameterDecl(Parameter parameter)

src/Generator/Generators/TypePrinter.cs

@@ -43,7 +43,8 @@ namespace CppSharp.Generators
             if (hasPlaceholder)
                 return string.Format(Type, $"{NamePrefix}{Name}{NameSuffix}");
 
-            var namePrefix = (Name.Length > 0) ? $"{NamePrefix} " : NamePrefix.ToString();
+            var namePrefix = (Name.Length > 0 && NamePrefix.Length > 0) ?
+                $"{NamePrefix} " : NamePrefix.ToString();
             return $"{Type}{namePrefix}{Name}{NameSuffix}";
         }
     }

src/Generator/Passes/SymbolsCodeGenerator.cs

@@ -232,7 +232,7 @@ namespace CppSharp.Passes
             string signature = GetSignature(function);
             cppTypePrinter.PrintTags = false;
 
-            string functionName = GetFunctionName(function, @namespace);
+            string functionName = GetFunctionName(function);
             if (function.FriendKind != FriendKind.None)
                 WriteRedeclaration(function, returnType, signature, functionName);
 
@@ -282,27 +282,14 @@ namespace CppSharp.Passes
             return $"({paramTypes}{variadicType}){@const}{refQualifier}";
         }
 
-        private string GetFunctionName(Function function, string @namespace)
+        private string GetFunctionName(Function function)
         {
             var nameBuilder = new StringBuilder();
-            if (function.Access != AccessSpecifier.Protected &&
-                !string.IsNullOrEmpty(@namespace))
-                nameBuilder.Append(@namespace).Append("::");
-
-            bool isConversionToSpecialization =
-                (function.OperatorKind == CXXOperatorKind.Conversion ||
-                 function.OperatorKind == CXXOperatorKind.ExplicitConversion) &&
-                function.OriginalReturnType.Type.Desugar(
-                    ).TryGetDeclaration(out ClassTemplateSpecialization specialization);
-
-            nameBuilder.Append(isConversionToSpecialization ?
-                "operator " : function.OriginalName);
+            nameBuilder.Append(function.Visit(cppTypePrinter).Name);
 
             if (function.SpecializationInfo != null)
                 nameBuilder.Append('<').Append(string.Join(", ",
                     GetTemplateArguments(function.SpecializationInfo.Arguments))).Append('>');
-            else if (isConversionToSpecialization)
-                nameBuilder.Append(function.OriginalReturnType.Visit(cppTypePrinter));
 
             return nameBuilder.ToString();
         }

tests/Common/Common.Tests.cs

@@ -70,6 +70,7 @@ public class CommonTests
         Common.TakeVoidStarStar(null);
         Common.OverloadPointer(IntPtr.Zero, 1);
         using (new DerivedFromSecondaryBaseWithIgnoredVirtualMethod()) { }
+        using (new CommonTest.SomeNamespace.NamespacedAbstractImpl()) { }
 
 #pragma warning restore 0168
 #pragma warning restore 0219

tests/Common/Common.cpp

@@ -529,10 +529,6 @@ std::string& HasStdString::getStdString()
     return s;
 }
 
-SomeNamespace::AbstractClass::~AbstractClass()
-{
-}
-
 int Function()
 {
     return 5;
@@ -1242,6 +1238,10 @@ TestCopyConstructorRef::TestCopyConstructorRef(const TestCopyConstructorRef& oth
 
 SomeStruct::SomeStruct() : p(1) {}
 
+void SomeNamespace::NamespacedAbstractImpl::AbstractMethod()
+{
+}
+
 ClassWithOverloadedOperators::ClassWithOverloadedOperators::operator char() { return 1; }
 ClassWithOverloadedOperators::operator int() { return 2; }
 ClassWithOverloadedOperators::operator short() { return 3; }

tests/Common/Common.h

@@ -474,12 +474,23 @@ class DLL_API SomeClassExtendingTheStruct : public SomeStruct
 
 namespace SomeNamespace
 {
-    class DLL_API AbstractClass
+    class DLL_API NamespacedAbstractClass
     {
     public:
-        ~AbstractClass();
         virtual void AbstractMethod() = 0;
     };
+
+    class DLL_API NamespacedAbstractImpl
+    {
+    public:
+        virtual void AbstractMethod();
+    };
+
+    class DLL_API Inlines
+    {
+    public:
+        inline operator NamespacedAbstractImpl () const { return NamespacedAbstractImpl(); }
+    };
 }
 
 // Test operator overloads