Function ImPlot_PlotBarsG 

pub unsafe extern "C" fn ImPlot_PlotBarsG(
    label_id: *const c_char,
    getter: Option<unsafe extern "C" fn(data: *mut c_void, idx: c_int) -> *mut ImPlotPoint>,
    data: *mut c_void,
    count: c_int,
    width: f64,
    offset: c_int,
)