Re: [Boost-users] Necessity of assert in iterators (as called from graph)?

From: David Ohlemacher (ohlemacher_at_[hidden])
Date: 2003-10-16 14:17:25

Hi Thomas,

I just got the same results as you did.  With -DNDEBUG, it runs fine.

Anyone know why?

Thanks,
-d

Thomas F. O'Connell wrote:

>In trying to compile and run the Kevin Bacon example for graph in the
>1.30.2 distribution of Boost, I was able to compile, but when I ran the
>executable, I got:
>
>kevin-bacon: /usr/local/boost-1.30.2/boost/token_iterator.hpp:75: void
>boost::detail::tokenizer_policy<Type,
>TokenizerFunc>::increment(Iterator&) [with Iterator =
>boost::iterator_adaptor<boost::detail::token_iterator_base<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, boost::detail::tokenizer_policy<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::char_delimiters_separator<char, std::char_traits<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, const std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, const std::basic_string<char, std::char_traits<char>, std::allocator<char> >*, std::forward_iterator_tag, ptrdiff_t>, Type = std::basic_string<char, std::char_traits<char>, std::allocator<char> >, TokenizerFunc = boost::char_delimiters_separator<char, std::char_traits<char> >]: Assertion `b.base().valid_' failed.
>Aborted
>
>Investigating led me to comment out the asserts on lines 69 and 75 of
>boost/token_iterator.hpp just to test. When I rebuilt without the
>asserts, I was able to run my executable with no problem with seemingly
>correct output.
>
>What purpose do the asserts serve, and why would they be failing?
>
>-tfo
>
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>  
>

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David Ohlemacher
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ohlemacher at bbn dot com