Call Non-Wx Object

#include <wx/wx.h>

class NonWxObject
{
public:
    void say_hello();
};

class Button : public wxFrame
{
private:
    NonWxObject thing;
public:
    Button(const wxString& title);

    void OnQuit(wxCommandEvent& event);
};

/////////////////////////////////////////////

#include "button.h"

void NonWxObject::say_hello()
{
    wxLogMessage("Hello");
}

Button::Button(const wxString& title)
    : wxFrame(NULL, wxID_ANY, title, wxDefaultPosition, wxSize(270, 150))
{

    wxPanel* panel = new wxPanel(this, wxID_ANY);

    wxButton* button = new wxButton(panel, wxID_EXIT, wxT("Quit"),
        wxPoint(20, 20));
    Connect(wxID_EXIT, wxEVT_COMMAND_BUTTON_CLICKED,
        wxCommandEventHandler(Button::OnQuit));
    button->SetFocus();
    Centre();
}


void Button::OnQuit(wxCommandEvent& WXUNUSED(event))
{
    thing.say_hello(); //  Close(true);
}

//////////////////////////////////////////////////////////////////////////////////

#include <wx/wx.h>

class MyApp : public wxApp
{
public:
    virtual bool OnInit();
};

/////////////////////////////////////////////

#include "main.h"
#include "button.h"



IMPLEMENT_APP(MyApp)

bool MyApp::OnInit()
{
    Button* btnapp = new Button(wxT("Button"));
    btnapp->Show(true);

    return true;
}