diff options
| -rw-r--r-- | README.rst | 25 |
1 files changed, 21 insertions, 4 deletions
@@ -143,10 +143,27 @@ key-value pairs. Extended types ^^^^^^^^^^^^^^^ -It is also possible to pack/unpack custom data types using the msgpack feature -of "extended types". For example, msgpack-pypy uses it to provide very fast serialization of int/float lists on top of PyPy (experimental for now): - -https://bitbucket.org/antocuni/msgpack-pypy/src/default/msgpack_pypy.py +It is also possible to pack/unpack custom data types using the msgpack 2.0 feature. + + >>> import msgpack + >>> import array + >>> def default(obj): + ... if isinstance(obj, array.array) and obj.typecode == 'd': + ... return msgpack.ExtType(42, obj.tostring()) + ... raise TypeError("Unknown type: %r" % (obj,)) + ... + >>> def ext_hook(code, data): + ... if code == 42: + ... a = array.array('d') + ... a.fromstring(data) + ... return a + ... return ExtType(code, data) + ... + >>> data = array.array('d', [1.2, 3.4]) + >>> packed = msgpack.packb(data, default=default) + >>> unpacked = msgpack.unpackb(packed, ext_hook=ext_hook) + >>> data == unpacked + True Advanced unpacking control |