Problems with shared_ptr and Python

[andreas.held]

Hi

I am trying to wrap shared_ptr code and I have run into some problems.
Running the following code through swig gives an exception:

%module example

%include <boost_shared_ptr.i>
SWIG_SHARED_PTR(Foo, Foo)

%inline %{
#include <boost/shared_ptr.hpp>
using boost::shared_ptr;
struct Foo {};
void test1(shared_ptr<Foo> f) {}
//void test2(boost::shared_ptr<Foo> f) {}
%}

My command line looks like:
swig -IC:/boost_1_40_0 -python example.i

and I am using swigwin-1.3.40 and boost-1.40.0

The exception I get looks like this:

$ swig -IC:/boost_1_40_0 -python example.i
example.i(5): Error: Syntax error in input(1).

Obviously I am doing something wrong but cannot figure out what the problem is. Does anybody have a minimum example that should work? Incidentally, trying the example fro the test suite (li_boost_shared_ptr.i) gives the same exception.

Best regards

Andreas

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[wsfulton]

andreas.held@... wrote:

> Hi
>
> I am trying to wrap shared_ptr code and I have run into some problems.
> Running the following code through swig gives an exception:
>
> %module example
>
> %include <boost_shared_ptr.i>
> SWIG_SHARED_PTR(Foo, Foo)
>
> %inline %{
> #include <boost/shared_ptr.hpp>
> using boost::shared_ptr;
> struct Foo {};
> void test1(shared_ptr<Foo> f) {}
> //void test2(boost::shared_ptr<Foo> f) {}
> %}
>
> My command line looks like:
> swig -IC:/boost_1_40_0 -python example.i

Should be:
swig -c++ -python example.i

>
> and I am using swigwin-1.3.40 and boost-1.40.0
>
> The exception I get looks like this:
>
> $ swig -IC:/boost_1_40_0 -python example.i
> example.i(5): Error: Syntax error in input(1).
>
> Obviously I am doing something wrong but cannot figure out what the problem is. Does anybody have a minimum example that should work? Incidentally, trying the example fro the test suite (li_boost_shared_ptr.i) gives the same exception.
>

I can't replicate that error using swig-1.3.40, try the correct command
line options given above.

William

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[andreas.held]

Hi William

Thank you for your quick reply. Sorry for my mistake in the command line. As you pointed out, the correct command line should be:
swig -c++ -python example.i

Still, even with that command line I do get the same error. I now stronly suspect that something is wrong with my boost installation. Anyway, I have now found a way around my problem by using
%template

This works fine and swig rocks again for me.

Best regards

Andreas

---- William S Fulton <wsf@...> schrieb:

> andreas.held@... wrote:
> > Hi
> >
> > I am trying to wrap shared_ptr code and I have run into some problems.
> > Running the following code through swig gives an exception:
> >
> > %module example
> >
> > %include <boost_shared_ptr.i>
> > SWIG_SHARED_PTR(Foo, Foo)
> >
> > %inline %{
> > #include <boost/shared_ptr.hpp>
> > using boost::shared_ptr;
> > struct Foo {};
> > void test1(shared_ptr<Foo> f) {}
> > //void test2(boost::shared_ptr<Foo> f) {}
> > %}
> >
> > My command line looks like:
> > swig -IC:/boost_1_40_0 -python example.i
> Should be:
> swig -c++ -python example.i
>
> >
> > and I am using swigwin-1.3.40 and boost-1.40.0
> >
> > The exception I get looks like this:
> >
> > $ swig -IC:/boost_1_40_0 -python example.i
> > example.i(5): Error: Syntax error in input(1).
> >
> > Obviously I am doing something wrong but cannot figure out what the problem is. Does anybody have a minimum example that should work? Incidentally, trying the example fro the test suite (li_boost_shared_ptr.i) gives the same exception.
> >
>
> I can't replicate that error using swig-1.3.40, try the correct command
> line options given above.
>
> William

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[wsfulton]

andreas.held@... wrote:
> Hi William
>
> Thank you for your quick reply. Sorry for my mistake in the command line. As you pointed out, the correct command line should be:
> swig -c++ -python example.i
>
> Still, even with that command line I do get the same error. I now stronly suspect that something is wrong with my boost installation.
It is impossible for SWIG to be affected by your boost installation
unless you tell it to via an include path (the -I option). However,
there might be a problem when your c++ compiler compiles the generated
code, as that will then use your boost installation.

> Anyway, I have now found a way around my problem by using
> %template
>
I don't know what you are doing wrong, but the SWIG_SHARED_PTR macro
invokes the %template directive for you. I think you need to post your
non-working example again.

William

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[andreas.held]

Hi William

This is my interface file boost_example.i:
%module example
 
// For plain classes, do not use for derived classes
%include "boost_shared_ptr.i"
MY_SWIG_SHARED_PTR(Foo, Foo)

struct Foo {};
void test1(shared_ptr<Foo> f) {}
void test2(boost::shared_ptr<Foo> f) {}

-----------------------------------------------------------

My command line:

$ swig -c++ -python boost_example.i
boost_example.i(6): Error: Syntax error in input(1).

I do get the same results whether I run the command from a MSYS shell or from the Windows Power Shell, obviously, both on Windows (XP to be accurate).

Finally, the version I am using:
$ swig -version

SWIG Version 1.3.40

Compiled with i586-mingw32msvc-g++ [i686-pc-linux-gnu]
Please see http://www.swig.org for reporting bugs and further information


Best regards and thanks for your help.

Andreas
---- William S Fulton <wsf@...> schrieb:

> andreas.held@... wrote:
> > Hi William
> >
> > Thank you for your quick reply. Sorry for my mistake in the command line. As you pointed out, the correct command line should be:
> > swig -c++ -python example.i
> >
> > Still, even with that command line I do get the same error. I now stronly suspect that something is wrong with my boost installation.
> It is impossible for SWIG to be affected by your boost installation
> unless you tell it to via an include path (the -I option). However,
> there might be a problem when your c++ compiler compiles the generated
> code, as that will then use your boost installation.
>
> > Anyway, I have now found a way around my problem by using
> > %template
> >
> I don't know what you are doing wrong, but the SWIG_SHARED_PTR macro
> invokes the %template directive for you. I think you need to post your
> non-working example again.
>
> William

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