The monitor whose pointer to return.
Errors: Possible errors include @ref GLFW_NOT_INITIALIZED.
This function may be called from any thread. Access is not synchronized.
@sa @ref monitor_userptr @sa @ref glfwSetMonitorUserPointer
Added in version 3.3.
Ingroup: monitor
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Returns the user pointer of the specified monitor.
This function returns the current value of the user-defined pointer of the specified monitor. The initial value is null.
This function may be called from the monitor callback, even for a monitor that is being disconnected.