Type Alias MDB_cmp_func 

pub type MDB_cmp_func = Option<unsafe extern "C" fn(a: *const MDB_val, b: *const MDB_val) -> c_int>;

@brief A callback function used to compare two keys in a database

Aliased Type

pub enum MDB_cmp_func {
    None,
    Some(unsafe extern "C" fn(*const MDB_val, *const MDB_val) -> i32),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*const MDB_val, *const MDB_val) -> i32)

Some value of type T.