Re: [boost] const problem with python interface

From: Victor A. Wagner, Jr. (vawjr_at_[hidden])
Date: 2002-07-10 13:40:55

apologies.... we were attempting to use part of the boost library and got 
an error, I mistakenly thought this was the place to report "bugs"

At Wednesday 2002/07/10 11:05, you wrote:
>??? Context, please ???
>Are you asking for help with something, or is this just informational?
>
>Please direct Boost.Python-specific questions to c++-sig_at_python.org.
>
>Thanks,
>Dave
>
>----- Original Message -----
>From: "Victor A. Wagner, Jr." <vawjr_at_[hidden]>
>
>
> > Using the commented out signature (the one with  .............., const
> > std::size_t key,............)
> > causes errors compiling on VC++.NET
> > It's not clear why declaring the key const should (in the philosophical
> > sense) cause any difficulties.  following the actual thread
> > of errors was beyond our abilities at the time.  Of course, the original
> > "error" didn't mention const anywhere, which didn't make finding the
> > problem any easier.
> >
> > <rant>I sure wish the .NET compiler would give the "called from" trace
>back
> > on all of it's errors/warnings to facilitate finding the perceived
> > problems(like VC++6 did).  This one we chased for over  an hour</rant>
> >
> > TimeStamps is equivalent to std::vector<double>
> > The error does NOT occur until        time_stamp.def(set_ts_item,
> > "__setitem__");       is added to the source.  That is, if the line is
> > removed, there is no error, but of course, we can't access set_ts_item
>either.
> > ========================================================
> >
> > // Sets the item corresponding to key in the map.
> > //void set_ts_item( TimeStamps& self, const std::size_t key, const
>double&
> > value)
> > void set_ts_item( TimeStamps& self, std::size_t key, const double& value)
> > {
> > self.at(key) = value;
> > }
> >
> > #include <boost/python/class_builder.hpp>
> > namespace python = boost::python;
> > BOOST_PYTHON_MODULE_INIT(PythonTest)
> > {
> > // Create an object representing this extension module.
> > python::module_builder this_module("PythonTest");
> > // TimeStamps
> > python::class_builder<TimeStamps> time_stamp(this_module, "TimeStamps");
> > time_stamp.def(boost::python::constructor<>());
> > time_stamp.def(&TimeStamps::size, "__len__");
> > time_stamp.def(get_ts_item, "__getitem__");
> > time_stamp.def(set_ts_item, "__setitem__");
> > }
> > Victor A. Wagner Jr.      http://rudbek.com
> > PGP RSA fingerprint = 4D20 EBF6 0101 B069 3817 8DBF C846 E47A
> > PGP D-H fingerprint = 98BC 65E3 1A19 43EC 3908 65B9 F755 E6F4 63BB 9D93
> > The five most dangerous words in the English language:
> >                "There oughta be a law"
> >
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Victor A. Wagner Jr.      http://rudbek.com
PGP RSA fingerprint = 4D20 EBF6 0101 B069 3817 8DBF C846 E47A
PGP D-H fingerprint = 98BC 65E3 1A19 43EC 3908 65B9 F755 E6F4 63BB 9D93
The five most dangerous words in the English language:
               "There oughta be a law"