Returning Typed Pointer of User Defined Class from Swift to C++

Development C++ interoperability
1

Hi,

I am trying to pass the pointer of class defined by me in swift from swift to C++. In the documentation it's mentioned that

QUTOE

Any function, property, or initializer is exposed to C++ only when Swift can represent all of its parameter and return types in C++. A parameter or return type can be represented in C++ only when:

  • it is a supported Swift structure / class / enumeration that is defined in the same Swift module.
  • or, it is a C++ structure / class / enumeration that is not annotated as a reference type.
  • or, it is one of the supported Swift standard library types.
    • if it’s a generic type, like Array, its generic parameters must be bound to one of the types listed here.
  • or, it is an UnsafePointer / UnsafeMutablePointer / Optional<UnsafePointer> / Optional<UnsafeMutablePointer> that points to any type from the supported three type categories listed above.

UNQUOTE

Under the Section - Swift Functions and Properties Supported by C++

Here's the code which I have written.

Swift Code:

public class MyClass {
    
    public init (_ pValue : Int32) {
        
        uValue = pValue
    }
    
    public var uValue : Int32
}

// Allocating the pointer
var pointer = UnsafeMutablePointer<MyClass>.allocate(capacity: MemoryLayout<MyClass>.size)

// Function which is called by C++ and it returns the pointer allocated.
public func ReturnMyClassPointer () -> UnsafeMutablePointer<MyClass> {
    
    return pointer
}

// Function called by c++ to deallocate.
public func ReleasePointer (_ pPtr : UnsafeMutablePointer<MyClass>) {
    
    pPtr.deallocate()
}

// InvokeC code .
Interop::InvokeC ()

C++ Code

void
CppClass::InvokeC()
{
    Test_Interop::MyClass * ptr = Test_Interop::ReturnMyClassPointer ();
    
    Test_Interop::ReleasePointer (ptr);
}

I am getting this build error:

No member named 'ReturnMyClassPointer' in namespace 'Test_Interop'

How can I do this?