On Mon, Jan 31, 2005 at 02:01:56PM +0100, Benjamin Schmeling wrote: > Hi, > > I am working on exposing a bigint class to python. Now I've got the > problem that methods which take an bigint as > an parameter do not accept Python longs. > > For example: > import _PythonLiDIA > x=123L; > c=_PythonLiDIA.bigint(); > _PythonLiDIA.gcd(c,x); > > > Traceback (most recent call last): > File "test.py", line 132, in ? > _PythonLiDIA.gcd(a,x); > Boost.Python.ArgumentError: Python argument types in > _PythonLiDIA.gcd(bigint, long) > did not match C++ signature: > gcd(LiDIA::bigint, LiDIA::bigint) > > I don't know how to achieve implicit conversion at this point, turning an > long automatically into an bigint. The other way round, turning an bigint > into long can be realized by defining __long__. > > Can someone help me please?
as later on you say you have a constructor to convert longs into your bigints, you should add a __coerce__ method to your class. General description of __coerce__: http://docs.python.org/ref/numeric-types.html#l2h-303 details on coercion rules: http://docs.python.org/ref/coercion-rules.html enjoy. -- John Lenton ([EMAIL PROTECTED]) -- Random fortune: BOFH excuse #309: firewall needs cooling
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