Re: [Boost-Users] shared_ptr and make_indirect_iterator

----- Original Message ----- From: "Peter Dimov" To: Sent: Thursday, August 29, 2002 12:17 AM Subject: Re: [Boost-Users] shared_ptr and make_indirect_iterator

From: "Richard Wolf"

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Hi

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

[...]

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int main() { list List2;

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

The reason is that make_indirect_iterator tries to instantiate std::iterator_traits< shared_ptr<A> >, and this fails, because shared_ptr<A> is not an iterator.

You can make the for_each work by using

for_each(List2.begin(), List2.end(), boost::mem_fn(&A::f)); // in

if that's what you want.

Thank you. I suppose this means that the container must contain a type that is an iterator rather than a pointer. A raw pointer works because raw pointers are iterators. But.... The documentation of Indirect Iterator Adapter says : "The indirect iterator adaptor augments an iterator by applying an extra dereference inside of operator*(). For example, this iterator makes it possible to view a container of pointers or smart-pointers (e.g. std::list) as if it were a container of the pointed-to type." Is the documentation incorrect, or have I misunderstood? Thanks Richard