Re: [Boost-users] Converting loop to using boost::lambda wherecontainers has boost::shared_ptrs

From: Christian Henning (chhenning_at_[hidden])
Date: 2007-05-20 21:40:05

Thanks a lot, again. ;-)

This is the working code now.

#include <string>
#include <sstream>
#include <boost/cstdint.hpp>
#include <vector>
#include <boost/shared_ptr.hpp>
#include <boost/bind.hpp>
#include <iostream>

class Base {
public:

   virtual std::string to_String ( boost::uint32_t indent ) = 0;

};

class A : public Base {
public:

   A ( boost::uint32_t value )
       : m_value ( value )
   {}

   virtual std::string to_String ( boost::uint32_t indent )
   {
       std::stringstream output;

       for ( boost::uint32_t i = 0; i < indent; i++ )
           {
               output << " ";
           }

       output << m_value;

       return output.str();
   }

private:

   boost::uint32_t m_value;
};

class D : public Base {
public:

   D ( boost::uint32_t value )
       : m_value ( value )
   {}

   virtual std::string to_String ( boost::uint32_t indent )
   {
       std::stringstream output;

       for ( boost::uint32_t i = 0; i < indent; i++ )
           {
               output << " ";
           }

       output << m_value;

       return output.str();
   }

private:

   boost::uint32_t m_value;
};

void print( const std::string& s )
{
   std::cout << s;
}

int main ( int, char** )
{
   typedef boost::shared_ptr<A> A_ptr_t;
   typedef boost::shared_ptr<D> D_ptr_t;

   typedef std::vector < boost::shared_ptr<Base> > Data_t;
   Data_t m_data;

   A_ptr_t a ( new A ( 50 ) );
   D_ptr_t d ( new D ( 30 ) );

   m_data.push_back ( a );
   m_data.push_back ( d );

   boost::uint32_t indent_value = 4;

   std::for_each ( m_data.begin(),
                   m_data.end(),
                   boost::bind( &print
                              , boost::bind( &Base::to_String
                                           , _1
                                           , indent_value      )));

   return 0;
}

It's still not quite what we what but we are getting closer. ;-)

Christian