MDB_msg_func typedef
@brief A callback function used to print a message from the library.
@paramin
msg The string to be printed.
@paramin
ctx An arbitrary context pointer for the callback.
@return < 0 on failure, >= 0 on success.
Implementation
typedef MDB_msg_func = ffi.NativeFunction<
ffi.Int Function(ffi.Pointer<ffi.Char> msg, ffi.Pointer<ffi.Void> ctx)>;