Binding arbitrary function in wxwidgets

I want to create a number of composite objects, each containing a scrolled list and some buttons (for my example, I've reduced the code to creating just one of the objects with just one button). All of these objects will be very similar, except for the layout, size, and the functions called by the buttons
(i.e. for each object, the callback for the same button can be different).

So, in the constructor for these composite objects, I want to receive the functions to bind to the buttons (again, in my example, it will be one button).

I have an example version that works (without the Bind function being passed), and an example that won't compile when I try to add the code passing in the function to Bind.

Here's the compiler error:

stack2.cpp: In constructor ‘MainPanel::MainPanel(wxFrame*)’:
stack2.cpp:106:94: error: no matching function for call to ‘MyAddRemoveList::MyAddRemoveList(MainPanel*, const char [12], const char [11], int, int, int, bool, void (MyAddRemoveList::*)(wxCommandEvent&))’
  106 | xLB_MULTIPLE | wxLB_HSCROLL | wxLB_NEEDED_SB, false, &MyAddRemoveList::OnAddToList);
                                                                           1,68          Top
tack2.cpp:61:1: note: candidate: ‘MyAddRemoveList::MyAddRemoveList(wxWindow*, const char*, const char*, int, int, long int, bool, func)’
   61 | MyAddRemoveList::MyAddRemoveList(wxWindow *panel, const char *display_name,
      | ^~~~~~~~~~~~~~~
stack2.cpp:62:79: note:   no known conversion for argument 8 from ‘void (MyAddRemoveList::*)(wxCommandEvent&)’ to ‘func’ {aka ‘void (*)(wxCommandEvent&)’}
   62 |       const char *table_name, int w, int h, long style, bool do_extract, func fpt) :
      |                                                                          ~~~~~^~~
stack2.cpp:41:7: note: candidate: ‘MyAddRemoveList::MyAddRemoveList(const MyAddRemoveList&)’
   41 | class MyAddRemoveList : public wxBoxSizer {
      |       ^~~~~~~~~~~~~~~
stack2.cpp:41:7: note:   candidate expects 1 argument, 8 provided
stack2.cpp:41:7: note: candidate: ‘MyAddRemoveList::MyAddRemoveList(MyAddRemoveList&&)’
stack2.cpp:41:7: note:   candidate expects 1 argument, 8 provided
make: *** [stack2.make:94: stack2.o] Error 1

I don't understand why the compiler can't cast void (*)(wxCommandEvent&) to void (MyAddRemoveList::*)(wxCommandEvent&). This is my problem.

Notes:

• I have pruned the code down to a minimal version (one that "works" without the Bind, and one with Bind that won't compile). But again, they're each about 100 lines and I don't know if that's too long to include in a question here.
• POP OS 22.04
• wxwidgets 3.0

How can I do this?

Here's the (hopefully) relevant code.

For clarity I have this:

using func = void(*)(wxCommandEvent& event);

Here's the constructor:

MyAddRemoveList::MyAddRemoveList(wxWindow *panel, const char *display_name, const char *table_name, int w, int h, long style, bool do_extract, func fpt) : wxBoxSizer(wxVERTICAL) {

/* stuff here */

Here's my attempt to bind:

/* stuff here */

wxButton *add = new wxButton(panel, wxID_ADD, "+", wxDefaultPosition, wxDefaultSize, wxBU_EXACTFIT);

add->Bind( wxEVT_BUTTON, fpt );

Here's the call to the constructor:

lookup_lists[0] = new MyAddRemoveList(this, "Ingredients", "ingredient", 80, 200, wxLB_MULTIPLE | wxLB_HSCROLL | wxLB_NEEDED_SB, false, &MyAddRemoveList::OnAddToList);

You are doing it all wrong and incorrect.

Please look at the different samples on how to make the GUI using wxWidgets.

Let me try and fix that for you.

You constructor is incorrect.
Do not pass the function into the constructor. Do it like this:

MyAddRemoveList::MyAddRemoveList(wxWindow *panel, const char *display_name, const char *table_name, int w, int h, long style, bool do_extract) : wxBoxSizer(wxVERTICAL)
{

    // The button creation code seems to be fine if you actually do have a "panel" created somewhere.

    wxButton *add = new wxButton(panel, wxID_ADD, "+", wxDefaultPosition, wxDefaultSize, wxBU_EXACTFIT);

    // The Bind call will look like this:

    add->Bind( wxeVT_BUTTON, &MyAddRemoveList::OnButtonClick, this );
}

MyAddRemoveList::OnButtonClick(wxCommandEvent &event)
{

    // Put generic code to start here

    switch( event.GetEventObject() )
    {
        case add:
        // Code unique to add
        break;
        case remove:
        // Code unique to remove
        break;
    }

    // Put generic code to finish the handler
}

And of course get rid of that func - you will not be needing it.

Finally you will be better off with using wxPanel instead of wxBoxSizer as sizers are not windows - they are just layout mechanism.

And please learn the language first - C++, Python, Perl, Ruby. All this languages have some way using wxWidgets.

Only when you know the language - go with the wxWidgets.

I hope it helps.