Type Alias MDB_msg_func 

pub type MDB_msg_func = Option<unsafe extern "C" fn(msg: *const c_char, ctx: *mut c_void) -> c_int>;

A callback function used to print a message from the library.

Arguments

• msg (direction in) - The string to be printed.
• ctx (direction in) - An arbitrary context pointer for the callback.

Returns

< 0 on failure, >= 0 on success.

Aliased Type

pub enum MDB_msg_func {
    None,
    Some(unsafe extern "C" fn(*const i8, *mut c_void) -> i32),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*const i8, *mut c_void) -> i32)

Some value of type T.

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.