pub unsafe extern "C" fn tr_lowerBound(
    key: *const c_void,
    base: *const c_void,
    nmemb: usize,
    size: usize,
    compar: Option<unsafe extern "C" fn(key: *const c_void, arrayMember: *const c_void) -> c_int>,
    exact_match: *mut u8
) -> c_int
Expand description

@brief similar to bsearch () but returns the index of the lower bound