Create static instance for class

Asked Aug 04 '22 at 17:50

Active Aug 04 '22 at 17:56

Viewed 32 times

so I'm trying to create static instance of class, so I can access it from anywhere.

RenderWindow.hpp

way

class RenderWindow{
 // ... code
 
  static RenderWindow* INSTANCE;
}

RenderWindow* window("Jump Game", 600, 700, SDL_WINDOW_RESIZABLE);
RenderWindow::INSTANCE = &window;

way

static RenderWindow* RENDER_WINDOW = NULL;
static RenderWindow* GetRenderWindow()
{
    if (RENDER_WINDOW == NULL)
    {
        RenderWindow window("Jump Game", 600, 700, SDL_WINDOW_RESIZABLE);
        RENDER_WINDOW = &window;
    }

    return RENDER_WINDOW;
}

I tried this but with none of them works..

edited Aug 04 '22 at 17:56

tadman

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asked Aug 04 '22 at 17:50

jiw

1

Please include the error you're getting. – lorro Aug 04 '22 at 17:51
2

This is generally called a "singleton" here is a [reference on how to implement](https://stackoverflow.com/questions/1008019/c-singleton-design-pattern) – Cory Kramer Aug 04 '22 at 17:52
In C++ use `nullptr` in preference to C's typeless `NULL`. – tadman Aug 04 '22 at 17:55
1

Re: "so I can access it from anywhere" -- so you want it to be **global** (not static). – Pete Becker Aug 04 '22 at 18:40

Create static instance for class

0 Answers0