[Boost-users] Using boost::shared_ptr with std::set

Subject: [Boost-users] Using boost::shared_ptr with std::set
From: przemyslaw.sliwa_at_[hidden]
Date: 2011-04-04 10:48:21

Hello,

I have to use a set of shared pointers to objects. The struct I have to 
use looks like

        struct eventIntLim
        {
                enum eType { eStart = 0, eEnd };

                eType   type;
                double  varianceBump;

                eventIntLim(eType t, double v) : type(t), varianceBump(v) 
{}

                bool operator < (const eventIntLim &rhs) const
                {
                        return fabs(varianceBump) < 
fabs(rhs.varianceBump);
                }
        };

and the definition of the set is 

                typedef boost::shared_ptr<eventIntLim> eventIntLimPtr;
                typedef std::set<eventIntLimPtr, lessThan> 
eventIntLimPtrSet;
                typedef std::map<size_t,  eventIntLimPtrSet> 
eventIntLimMap;

In order to sort the objects in the set I have to use the functor

        struct lessThan : public 
std::binary_function<boost::shared_ptr<eventIntLim>, 
boost::shared_ptr<eventIntLim>, bool>
        {
                bool operator ()(const boost::shared_ptr<eventIntLim> 
&lhs, const boost::shared_ptr<eventIntLim> &rhs) const
                {
                        return (*lhs) < (*rhs);
                }
        };

This is quite long and I believe boost can shorten it a lot. I have tried 
it with boost::lamba and boost::bind but could not make it working. 
Basically I would like to eliminate the need of writing the definition of 
struct lessThan. Could someone help me with that? 

Cheers

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