--- Tim Peters <tim.one@comcast.net> wrote:
> So it's unlikely you're going to get a change in what the proto 0 APPEND
> (which calls append()) and proto 1 APPENDS (which calls extend()) opcodes
> do. Adding brand new opcodes is still possible, but I doubt it's possible
> for Guido or me to do the work.
Sounds like a chance for plan B: a thin wrapper around a Python string.
Called "pickle_string" in the revised prototype below. Ruling out the
possibility that users want to create C++ arrays of Python
pickle_strings this will work for all types. Creating a trivial type
like pickle_string is a snag with Boost.Python. But I am guessing that
the Numarray people must hate it, unless they have another simple
work-around.
I believe the brand new opcode is the better long-term solution for the
community. I'd be willing to invest a little time if others are also
interested and willing to help.
Ralf
import pickle
class pickle_string(object):
def __init__(self, size):
self.size = size # here we allocate the string
self.string = "" # this will be a reference to the Python string object
# the C++ implementation will write directly into the string contained here
def __getstate__(self):
return self.string # return a reference
def __setstate__(self, state):
self.string = state # copy a reference
class int_array(object):
def __init__(self, elems):
self.elems = list(elems)
def __reduce__(self):
return (int_array_factory,
(len(self.elems),),
None,
int_array_iter(self.elems))
def append(self, value):
if (type(value) == type(pickle_string(0))):
values = [int(x) for x in value.string.split(",")]
self.elems.extend(values)
else:
self.elems.append(value)
class int_array_iter(object):
def __init__(self, elems, buf_size=4):
self.elems = elems
self.buf_size = 4
self.i = 0
def __iter__(self):
return self
def next(self):
if (self.i >= len(self.elems)): raise StopIteration
result = pickle_string(123)
for i in xrange(self.buf_size):
result.string += str(self.elems[self.i]) + ","
self.i += 1
if (self.i == len(self.elems)): break
result.string = result.string[:-1]
return result
def int_array_factory(size):
print "reserve:", size
return int_array([])
f = int_array(range(11))
f.append(13)
print "f.elems:", f.elems
s = pickle.dumps(f)
print s
g = pickle.loads(s)
print "g.elems:", g.elems
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