Type Alias lmdb_master_sys::MDB_msg_func

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

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§

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

Variants§

§1.0.0

None

No value.

§1.0.0

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