implicit conversion

[Benjamin Schmeling]

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?
Benjamin
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Re: implicit conversion

[Benjamin Schmeling]

Alex Martelli wrote:
Benjamin Schmeling <[EMAIL PROTECTED]> wrote:
  ...
 

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__.
  

Perhaps adding to your bigint class a constructor (not declared as
``explicit'', if you're coding C++) which accepts as its argument a
python long might help...?
Alex
 

I have got such an constructor now (my_type(long_)), but nevertheless 
implicit conversion from long to my_type isn't supported. Any other ideas?

Benjamin
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