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KaiserJohan

GLFW keyboard callback and boost binding

3 posts in this topic

Hello,

I have a class "InputManager" in which I want to define the callback function that I later provide to GLFW for keyboard callbacks. I am normally using boost::bind for such tasks, but I for some reason cannot get this one to work, and the compile error I cannot read,

The GLFW callback is described in [url="http://www.glfw.org/GLFWUsersGuide276.pdf"]http://www.glfw.org/...ersGuide276.pdf[/url], 4.2.2, declared

[CODE]
typedef void (GLFWCALL * GLFWcharfun)(int,int);
[/CODE]
where GLFWCALL is just empty macro.

My member callback is declared as:

[CODE]void GLFWCALL glfwCharCallback(int, int);[/CODE]

I try to setup the callback like:

[CODE]bool InputManager::Init(const EngineSettings& engineSettings)
{
glfwSetCharCallback(boost::bind(&InputManager::glfwCharCallback, this, _1, _1));
return true;
}
[/CODE]


To which Visual studio gives me a quite long and generic, syntax error. What am I doing wrong in this case with boost bind?

Thanks Edited by KaiserJohan
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Anything returned by boost::bind or its more limited std equivalents is not a function pointer. It's a (rather complicated) set of templated nested objects.

You will need to use either a free function or a static function in InputManager. I'm not fluent in GLFW but you can probably make InputManager a singleton (because GLFW only supports exactly one window) or there will be some way to store something pointer-like (for storing the this pointer of the relevant instance) as user data. Edited by BitMaster
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[quote name='BitMaster' timestamp='1349680983' post='4987888']
Anything returned by boost::bind or its more limited std equivalents is not a function pointer. It's a (rather complicated) set of templated nested objects.
You will need to use either a free function or a static function in InputManager.
[/quote]
This is good advice.
[quote name='BitMaster' timestamp='1349680983' post='4987888']
I'm not fluent in GLFW but you can probably make InputManager a singleton (because GLFW only supports exactly one window)
[/quote]
Whoa there. I see what you're saying - a free function taking 2 ints is needed, and to forward from said free function to the InputManager class instance requires that the function has/gets a reference to the instance in some way. For a free function to access a class instance that's not one of it's parameters we need some form of global or static access - we agree so far.

But this is a horrible reason to create a singleton. You don't want a singleton, you want a static or global point of access to a class instance. Most (all?) singleton implementations do that as a side-effect, but comes at the horrible cost of introducing a singleton [img]http://public.gamedev.net//public/style_emoticons/default/biggrin.png[/img]
[quote name='BitMaster' timestamp='1349680983' post='4987888']
or there will be some way to store something pointer-like (for storing the this pointer of the relevant instance) as user data.
[/quote]
OK, so you're assuming that one of the ints passed to the callback is this userdata? Maybe it is, but maybe (probably) not - I didn't download GLFW to check either [img]http://public.gamedev.net//public/style_emoticons/default/smile.png[/img] and the docs don't appear to give any more info on the callback signature.

For my money this is probably a case where an honest-to-goodness global is the right answer. Edited by mrbastard
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