Re: [Boost-users] [boost::wave] Finding out if a macro is defined

6 Mar 2007

      Many thanks for such a quick response!

On Tue, March 6, 2007 20:09, Hartmut Kaiser wrote:
...
Ovanes Markarian wrote:
[snipped clarified text]
...
...
I assume compiler dereferences iterator to char and char has
no member to get_value. Does anyone have suggestions?
That's a bug. It's fixed in CVS::HEAD now. You can work around this problem
for now by using a instance of context_type::token_type::string_type instead
of a std::string for now.
I tried to work with context_type::token_type::string_type (On my machine it is resolved to
flex_string) the problem is that the construct:

std::string s1("some string...");
context_type::token_type::string_type s2(s1->begin(), s1->end());

crashed the app in the assign function call from the ctor:

template <class InputIterator>
    flex_string(InputIterator begin, InputIterator end, const A& a = A())
    : Storage(a)
    {
       flex_string.hpp:1479: assign(begin, end); >>>>  boom!!!
    }

The problem is:

assign calls replace:

template<class InputIterator>
line 1906:    flex_string& replace(iterator i1, iterator i2,
        InputIterator j1, InputIterator j2)
    {
        return ReplaceImpl(i1, i2, j1, j2,
            Selector<std::numeric_limits<InputIterator>::is_specialized>());
    }

Replace has BOOST_ASSERT(false) statement:
template<class InputIterator>
line 1897:    flex_string& ReplaceImpl(iterator i1, iterator i2,
        InputIterator b, InputIterator e, Selector<0>)
    {
        BOOST_ASSERT(false);
        return *this;
    }
...
I'll try to add these fixes to the upcoming release as well, but will have
to ask the release manager first.
Regards Hartmut
May be you can take a look at the calling logic and why this assertion should fail?

Many Thanks for your help!

With Kind Regards,

Ovanes Markarian