boost:shared_ptr cast problem

From:

Jun <junhufr@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Sun, 25 Nov 2007 13:12:06 -0800 (PST)

Message-ID:

<4c551674-0761-4978-9460-c9c15f458e91@w28g2000hsf.googlegroups.com>

Hello,

I've code like :
===========================================
class A{
            public :
                     // create print content
                     friend std::ostream& operator<< (std::ostream&
os, const A& a);

}

typedef boost::shared_ptr<A> APtr; // Define A class smart pointer

APtr aPtr1(new A());
APtr aPtr2(new A());
APtr aPtr3(new A());

vector<APtr> AVec;
AVec.push_back(aPtr1);
AVec.push_back(aPtr2);
AVec.push_back(aPtr3);

std::copy(AVec.begin(),AVec.end(),
std::ostream_iterator<APtr>(std::cout, "\n"));

std::copy(AVec.begin(),AVec.end(), std::ostream_iterator< share_ptr<A>

(std::cout, "\n"));

===========================================

The two copy methods only output the address of pointers, they could
just print the class A defined print contents. And following code
works :
===========================================
vector<APtr>::iterator i = AVec.begin();
        for(; i!= AVec.end(); ++i){
            cout << *static_cast<APtr>(*i) << endl;
            }
===========================================

Anyone has some ideas for that ? Thank you in advance.

Jun