Re: Header error in boost/python/object/make_holder?

on Wed Oct 10 2007, "Michel Valstar"
<Michel.Valstar-AT-imperial.ac.uk> wrote:

> I am trying to build code of a recently graduated
student, who is now unavailable to us (read:
> ignores us). When running scons in the appropriate
directory, a lot gets build, until I get the
> following error:
>
> /usr/include/boost/python/object/make_holder.hpp:81:
error: 'allocate' is not a member of
>
'boost::python::objects::value_holder<std::pair<const
std::basic_string<char, std::char_traits
> <char>, std::allocator<char> >,
State> >'
> /usr/include/boost/python/object/make_holder.hpp:83:
error: no matching function for call to
>
'boost::python::objects::value_holder<std::pair<const
std::basic_string<char, std::char_traits
> <char>, std::allocator<char> >,
State> >::value_holder(int*&)'
> /usr/include/boost/python/object/value_holder.hpp:44:
note: candidates are:
>
boost::python::objects::value_holder<std::pair<const
std::basic_string<char, std::char_traits
> <char>, std::allocator<char> >,
State> >::value_holder()
> /usr/include/boost/python/object/value_holder.hpp:44:
note:                
>
boost::python::objects::value_holder<std::pair<const
std::basic_string<char, std::char_traits
> <char>, std::allocator<char> >,
State> >::value_holder(const
>
boost::python::objects::value_holder<std::pair<const
std::basic_string<char, std::char_traits
> <char>, std::allocator<char> >,
State> >&)
> scons: *** [trackerbase/trackerbasewrapper.os] Error 1
> scons: building terminated because of errors.
>
> This does not seem to be an error in his own code,
rather an error in the boost.python code?
> This is the first time I am using boost, and, as usual,
I need to get this program working
> yesterday.
>
> My machine is a recently installed Ubuntu Feisty (hence
the need for re-compilation). I am using
> the latest version of Boost (boost_1_34_1) and python
2.5.1
>
> Any help would be appreciated.

I'll try.

First, please read the Note at
http://boost.org/libs/python/doc/building.ht
ml#no-install-quickstart

Also, please note that
http
://boost.org/more/mailing_lists.htm#cplussig may be a
better place
to ask this question.  I'm following up there.

I'm pretty sure this is an error in your student's code and
the
compiler is giving you a poor error message.  Most probably

  std::pair<std::basic_string<char,
std::char_traits<char>,std::allocator<char>
>, State> 

is an incomplete type at the point where make_holder is
being used.
However, guessing is really futile.  If my guess is wrong,
please
prepare and post a minimal, complete example as described
in
http://arti
cle.gmane.org/gmane.comp.python.c++/10237/match=minimal+comp
lete+example+reproduce+jamfile

9 times out of 10, preparing a minimal example reveals the
actual
problem to the person asking the question 

Cheers,

-- 
Dave Abrahams
Boost Consulting
http://www.boost-cons
ulting.com

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On Oct 15, 2007, at 12:43 PM, David Abrahams wrote:
> 9 times out of 10, preparing a minimal example reveals
the actual
> problem to the person asking the question 

Speaking of which, and I'm changing the subject rather
selfishly, but  
I still haven't had an answer about what the bindings to:

	struct Foo
	{
		unsigned char data[4];
	};

should be... and I don't think that type of question to this
 
newsgroup gets any more minimal than that. 

T

--
Some people, when confronted with a problem, think "I
know, I'll use  
regular expressions."  Now they have two problems.
   --Jamie Zawinski, in comp.lang.emacs

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