shared_ptr and make_indirect_iterator

From: Richard Wolf (richard_at_[hidden])
Date: 2002-08-27 19:41:31

Hi

I'm trying to use make_indirect_iterator on a container of shared_ptrs as
follows:

#include <boost/iterator_adaptors.hpp>
#include <boost/shared_ptr.hpp>
#include <list>
#include <algorithm>
#include <functional>

using std::mem_fun_ref;
using std::mem_fun;
using std::list;
using boost::shared_ptr;
using std::for_each;
using boost::make_indirect_iterator;

class A
{
public:
    void f(){}
};
int main()
{
    list<A *> List1;
    list<shared_ptr<A> > List2;

    // This works
    for_each(make_indirect_iterator(List1.begin()),
                  make_indirect_iterator(List1.end()),
                  mem_fun_ref(&A::f));

     // This doesn't work
    for_each(make_indirect_iterator(List2.begin()),
                  make_indirect_iterator(List2.end()),
                  mem_fun_ref(&A::f));
}

The second use of for each fails to compile (error messages at the end of
the message).
Is it possible to do this? Am I doing something wrong?

I'm using gcc v 2.95.2. and the QNX OS.

Thanks

Richard

QCC -I/home/rwolf/boat/src/includes -I/home/rwolf/boat/src/boost_1_27_0 -Wal
l  -L/home/rwolf/boat/src/lib -L. -O -g -I/home/rwolf/boat/src/includes -I/h
ome/rwolf/boat/src/boost_1_27_0 -Wall   test.cpp   -o test
/usr/include/xutility: In instantiation of
`std::iterator_traits<boost::shared_ptr<A> >':
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1104:
instantiated from
`boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::all
ocator<boost::shared_ptr<A> > >::iterator>'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177:
instantiated from here
/usr/include/xutility:81: no type named `iterator_category' in `class
boost::shared_ptr<A>'
/usr/include/xutility:82: no type named `value_type' in `class
boost::shared_ptr<A>'
/usr/include/xutility:83: no type named `difference_type' in `class
boost::shared_ptr<A>'
/usr/include/xutility:84: no type named `difference_type' in `class
boost::shared_ptr<A>'
/usr/include/xutility:85: no type named `pointer' in `class
boost::shared_ptr<A>'
/usr/include/xutility:86: no type named `reference' in `class
boost::shared_ptr<A>'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: In
instantiation of
`boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::all
ocator<boost::shared_ptr<A> > >::iterator>':
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177:
instantiated from here
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1104: no type
named `value_type' in `struct std::iterator_traits<boost::shared_ptr<A> >'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1105: no type
named `reference' in `struct std::iterator_traits<boost::shared_ptr<A> >'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1106: no type
named `pointer' in `struct std::iterator_traits<boost::shared_ptr<A> >'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: In function
`int main()':
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type
named `value_type' in `struct
boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo
cator<boost::shared_ptr<A> > >::iterator>'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type
named `reference' in `struct
boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo
cator<boost::shared_ptr<A> > >::iterator>'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type
named `pointer' in `struct
boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo
cator<boost::shared_ptr<A> > >::iterator>'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template
argument 2 is invalid
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template
argument 3 is invalid
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template
argument 5 is invalid
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: At top level:
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: In
instantiation of
`boost::make_indirect_iterator<std::list<boost::shared_ptr<A>,std::allocator
<boost::shared_ptr<A> > >::iterator>(...)':
test.cpp:26:   instantiated from here
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type
named `value_type' in `struct
boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo
cator<boost::shared_ptr<A> > >::iterator>'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type
named `reference' in `struct
boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo
cator<boost::shared_ptr<A> > >::iterator>'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: no type
named `pointer' in `struct
boost::detail::traits_of_value_type<std::list<boost::shared_ptr<A>,std::allo
cator<boost::shared_ptr<A> > >::iterator>'
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template
argument 2 is invalid
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template
argument 3 is invalid
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: template
argument 5 is invalid
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp: In function
`{error}
boost::make_indirect_iterator<std::list<boost::shared_ptr<A>,std::allocator<
boost::shared_ptr<A> > >::iterator>(...)':
/home/rwolf/boat/src/boost_1_27_0/boost/iterator_adaptors.hpp:1177: confused
by earlier errors, bailing out
cc: /usr/lib/gcc-lib/ntox86/2.95.2/cc1plus error 34
make: *** [test] Error 1