Function libslang_sys::slang::SLprep_set_exists_hook

pub unsafe extern "C" fn SLprep_set_exists_hook(
    arg1: *mut SLprep_Type, 
    arg2: Option<unsafe extern "C" fn(arg1: *mut SLprep_Type, arg2: *mut c_char) -> c_int>
) -> c_int