CODEWITHSUNDEEP
c++callbackglfw
Gen0me
Gen0me

Reputation: 135

Does GLFWwindow * window still points to valid glfw object?

I Initialize Glfw, create window and set scroll callback:

GLFWwindow * window = glfwCreateWindow (...);
glfwSetScrollCallback(window, GlScrollInput);

I have somewhere else function:

GlScrollInput (GLFWwindow * window, double x, double y){...}

Lets say after first usage I stored this pointer GLFWwindow * window. Is there a way to tell if this glfw window pointer is still valid(window is initialized and not destroyed or terminated)?

Upvotes: 0

Views: 260

Answers (1)

Makogan
Makogan

Reputation: 9540

You need to keep track of that yourself. In general, it's impossible for any C++ framework to check whether a raw pointer is still valid.

If the memory a pointer points to is freed, accessing its contents is now undefined behaviour. Any value could be in that section of RAM, thus any check you do will give you a random answer at best or segfault at worst.

TL;DR when working with pointers in C++ it's your responsibility to track the lifetime of your objects.

When a window in GLFW is destroyed, its contents will be freed, thus running into the above scenario.

Upvotes: 1

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