Hello,
Thank you very much for your answer, but what I really wanted was to
expose to Python just the first element of the pair and not the whole
pair, so that the fact that it is a pair in c++ would be transparent to
python. For instance, if I had struct A{std::pair<int,bool> a;};, I just
wanted to expose a.first, as a simple int...
Any ideas for this?
Thanks,
Ricardo
Ralf W. Grosse-Kunstleve wrote:
I'd define to/from Python conversions for the std::pair, mapping to
Python tuples, then use .add_property().
Alternatively, wrap std::pair the normal way via class_, then you
can use .def_readwrite().
You need to handle each std::pair<A,B> combination of A,B separately,
like any other template class you want to wrap or convert to/from a
Python object.
See also:
http://www.boost.org/doc/libs/1_37_0/libs/python/doc/v2/faq.html#custom_string
This could be a starting point for std::pair<A,B> conversions. Probably you want
to make it into a converter template if you have more than one combination of
A,B.
Here is code we use for the to_python conversions:
http://cci.lbl.gov/cctbx_sources/boost_adaptbx/
std_pair_conversion.h
std_pair_ext.cpp
We don't have corresponding from_python conversions.
If you add them, let me know!
The next item in the FAQ is also relevant.
----- Original Message ----
From: Ricardo Abreu <gumb...@gmail.com>
To: cplusplus-sig@python.org
Sent: Monday, January 19, 2009 7:27:46 AM
Subject: [C++-sig] Exposing members of members
Hello,
Suppose that I have a class A with a member of type std::pair, called a. If I
want to expose class A to python while allowing read/write access to the object
pointed to by a.first, what to I put in def_readwrite?
I tried something like class<A>("A").def_readwrite("a", &A::a::first); but it
doesn't work. Also been trying with boost::bind but didn't have any luck :s
I know I could do getters and setters, but there would be a lot of them because my "A"
has a lot of members like "a".
Thank you in advance,
Ricardo
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