libnspire 0.2.3

high-level bindings to libnspire for USB interaction with TI Nspire calculators
Documentation 
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use std::os::raw::c_void;

pub struct CallbackData<'a>(pub &'a mut dyn FnMut(usize));

impl CallbackData<'_> {
    pub unsafe extern "C" fn callback(size: usize, data: *mut c_void) {
        let data = &mut *(data as *mut CallbackData);
        data.0(size);
    }
    pub fn as_mut_void(&mut self) -> *mut c_void {
        self as *mut CallbackData as *mut c_void
    }
}