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

18 Feb 2006


      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  wrote:
...
On 2/17/06, Meryl Silverburgh  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 
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 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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