Function ImDrawList_AddCallback
pub unsafe extern "C" fn ImDrawList_AddCallback(
self_: *mut ImDrawList,
callback: Option<unsafe extern "C" fn(_: *const ImDrawList, _: *const ImDrawCmd)>,
callback_data: *mut c_void,
)pub unsafe extern "C" fn ImDrawList_AddCallback(
self_: *mut ImDrawList,
callback: Option<unsafe extern "C" fn(_: *const ImDrawList, _: *const ImDrawCmd)>,
callback_data: *mut c_void,
)