Boost logo

Boost :

From: Michael B. Edwin Rickert (panda_at_[hidden])
Date: 2005-05-27 20:03:30

I hope I've got the right list here (first time poster), my apologies if
I don't :-).

boost::array fails a ContainerConcept check in 1.32 due to it's lack of
a const_pointer typedef:

#include <boost/array.hpp>
#include <boost/concept_check.hpp>

int main ( void )
    using namespace boost;
    function_requires< ContainerConcept< array< int , 5 > > >();

Resulting errors using MinGW's GCC 3.4.2:

boost/concept_check.hpp: In instantiation of
`boost::ContainerConcept<boost::array<int, 5u> >':
boost/concept_check.hpp:48: instantiated from `void
boost::function_requires(boost::mpl::identity<T>*) [with Concept =
boost::ContainerConcept<boost::array<int, 5u> >]'
../ instantiated from here
boost/concept_check.hpp:683: error: no type named `const_pointer' in
`class boost::array<int, 5u>'

I noticed the BCCL links to SGI's documentation for the Contanier
concept, which actually does not appear to list a const_pointer (see, although it does include
pointer, which array is lacking. As allready mentioned, I tried this
with 1.32 - I also tried the CVS head version, no idea if that's the
latest that I should be checking or what (CVS newbie), but this wasn't
fixed in there.

In any case, adding const_pointer to array allows the simple example to
compile - here's a patch which adds this and pointer (hopefully in an OK
format - I'm a solo hobbyist, not used to working on large projects)
which adds them... let me know if I can be of any other help :-).

Index: array.hpp
RCS file: /cvsroot/boost/boost/boost/array.hpp,v
retrieving revision 1.23
diff -u -r1.23 array.hpp
--- array.hpp 9 Sep 2004 13:59:00 -0000 1.23
+++ array.hpp 28 May 2005 00:58:03 -0000
@@ -50,6 +50,8 @@
         typedef const T* const_iterator;
         typedef T& reference;
         typedef const T& const_reference;
+ typedef T* pointer;
+ typedef const T* const_pointer;
         typedef std::size_t size_type;
         typedef std::ptrdiff_t difference_type;

Boost list run by bdawes at, gregod at, cpdaniel at, john at