Re: SPAM-LOW: Re: [Swig-user] Python SWIG std::map error?

[Gardner P. <ga...@ne...>]

Thank you, thank you, thank you!

Ok, I changed example.i to what you have listed below, and tried this
runme.py:

# file: runme.py
# test of std::map<std::string, std::string>;
import example

v =3D example.map_si()
v['hi'] =3D 'no'
v['bye'] =3D 'yes'
print v.keys()
print v.values()

Executing "python runme.py" results in this output:

['bye', 'hi']
('yes', 'no')

This is SO COOL! I have an application in python that loads 5M lines from a
171MB file. Putting them into a dictionary with 5M entries uses up 1.5GB of
ram. This SWIG will allow me to save a HUGE amount of memory.

Thank you so much!

- Gardner

On 1/7/06, Marcelo Matus <mm...@ac...> wrote:
>
> As the std_map.i file says, std::map requires to instantiate std::pair.
>
> So you need to do:
>
> %module example
>
> %include "std_string.i"
> %include "std_map.i"
>
> /* instantiate the required template specializations */
> %template() std::pair<std::string, std::string>;
> %template(map_si)  std::map<std::string, std::string>;
>
>
> Marcelo
>
>
> Gardner Pomper wrote:
>
> > Hi,
> >
> > I have a need for a C++ std::map<std::string,std::string> in my python
> > program, so I download swig. I tried the following as an example to
> > use std::map, but I get errors when I try to compile the generated
> > .cxx file. Here is my example:
> >
> > /* File : example.i */
> > %module example
> >
> > %include "std_string.i"
> > %include "std_map.i"
> >
> > /* instantiate the required template specializations */
> > %template(map_si)  std::map<std::string, std::string>;
> >
> > I have tried the std_vector example in the python examples, and that
> > worked. The command I run this with is:
> >
> > swig -c++ -python example.i
> > make
> >
> > Here is the beginning of the output I get from that:
> >
> > make -f ../../Makefile CXXSRCS=3D'' SWIG=3D'../../../preinst-swig' \
> > SWIGOPT=3D'' TARGET=3D'example' INTERFACE=3D'example.i' python_cpp
> > make[1]: Entering directory
> > `/home/gardner/downloads/swig-1.3.27/Examples/python/std_map'
> > ../../../preinst-swig -c++ -python  example.i
> > g++ -c -fpic  example_wrap.cxx    -DHAVE_CONFIG_H
> > -I/usr/local/include/python2.4 -I/usr/local/lib/python2.4/config
> > example_wrap.cxx: In function `const char* swig::type_name() [with Type
> =3D
> >    std::string]':
> > example_wrap.cxx:1596:   instantiated from `static swig_type_info*
> > swig::traits_info<Type>::type_info() [with Type =3D std::string]'
> >
> > I am running swig 1.3.27 on Quantian Linux (debian base, kernel
> > 2.4.27) using gcc version 3.3.4.
> >
> > If anyone has an example of using an STL map from python, I would be
> > very grateful!
> >
> > Thanks,
> >
> > - Gardner
> >
>
>
>