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>;

A callback function used to compare two keys in a database

Aliased Type

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.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes

Size for each variant:

• None: 0 bytes
• Some: 8 bytes