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General / How to pass by reference properly

« on: December 21, 2010, 12:43:29 pm »

Here is a stripped down version of what works, but isn't exactly what I want to do:

Code: [Select]


//--------------
//main.cpp
//--------------
#include "SettingsContainer.h"
#include <iostream>

int main()
{
    Blah::AllSettings settings;
    Blah::SettingsContainer container;

    container.init(settings);
    std::cout << settings.App->IsOpened();  // <- returns false because it is destroyed as soon as it is created

    while(settings.App->IsOpened())
    {
        while (settings.App->GetEvent(*settings.Event))
        {
            // Close window : exit
            if (settings.Event->Type == sf::Event::Closed)
                settings.App->Close();

            // Escape key : exit
            if ((settings.Event->Type == sf::Event::KeyPressed) && (settings.Event->Key.Code == sf::Key::Escape))
                settings.App->Close();


            // Resize event : adjust viewport
            if (settings.Event->Type == sf::Event::Resized)
                glViewport(0, 0, settings.Event->Size.Width, settings.Event->Size.Height);
        }
        settings.App->SetActive();
    }
    return EXIT_SUCCESS;
}

//--------------
//SettingsContainer.h
//--------------

#ifndef SETTINGSCONTAINER_H
#define SETTINGSCONTAINER_H

#include <SFML/Window.hpp>

namespace Blah
{
    struct AllSettings
    {
        sf::Window* App;
        sf::Event* Event;
    };

    class SettingsContainer
    {
        protected:
        private:
            AllSettings settings;
        public:
            SettingsContainer();
            virtual ~SettingsContainer();
            void init(AllSettings&);
    };
};
#endif // SETTINGSCONTAINER_H


//--------------
//SettingsContainer.cpp
//--------------

namespace Blah
{
    SettingsContainer::SettingsContainer()
    {
        //ctor
    }

    SettingsContainer::~SettingsContainer()
    {
        //dtor
    }

    void SettingsContainer::init(AllSettings& settings)
    {
        sf::Window App(sf::VideoMode(800, 600, 32), "SFML OpenGL");
        sf::Event Event;

        settings.App = &App;
        settings.Event = &Event;
    }
}

//---------------------


The problem is that I can't seem to get it to not be destroyed (which is what I believe is happening)  I would like to store the screen state in a struct that I can pass around instead of having a bunch of garbage in main().  I have added pointers in all sorts of crazy ways, but can not seem to get any of my implementations to work except for this one.  I even used new to allocate Blah::SettingsContainer, but to no avail because I could never get it to compile.

I know that this is more of a C++ question in general.  If anyone has suggestions, it would be much appreciated.  I am sure there that I have been vague in some way that I did not think of.  I am using Code::Blocks with MinGW 4.4.5 on a WinXP computer with an AMD processor if that matters.

Thank you