Re: [Boost-users] How to use bind library to de-reference a pointer

From: Meryl Silverburgh (silverburgh.meryl_at_[hidden])
Date: 2006-02-18 00:11:10

My case is using a vector of a pointer of a Class say 'A' which that
class's constructor is private.

On 2/17/06, me22 <me22.ca_at_[hidden]> wrote:
> On 2/17/06, Meryl Silverburgh <silverburgh.meryl_at_[hidden]> wrote:
> > Why boost is trying to make a copy of A (a vector is a list of A*).
> >
> > And how can I fix that without making A constructor public?
> >
>
> I have no idea why it'd be doing that -- some more code would be helpful.
>
> The following testcase seems to work fine:
> #include <iostream>
> #include <vector>
> #include <algorithm>
> #include <boost/bind.hpp>
>
> template <typename T>
> struct dereference_as {
>    typedef T& result_type;
>    template <typename P>
>    result_type operator()(P ptr) {
>        return *ptr;
>    }
> };
>
> void showfirst(char c) { std::cout << c << std::endl; }
>
> int main() {
>
>     std::vector<char const*> v;
>     v.push_back( "1" );
>     v.push_back( "2" );
>     v.push_back( "3" );
>     v.push_back( "4" );
>     v.push_back( "5" );
>     v.push_back( "6" );
>
>     std::for_each( v.begin(), v.end(),
>                    boost::bind( &showfirst, boost::bind(
> dereference_as<char const>(), _1 ) ) );
> }
>
>
> ~ Scott
>
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