Template?

[Technocrat]

I was wondering if there was an easier way to this maybe with a template?

I have a bunch of structs that have one common element. I use that common element to do a std::lower_bound on a vector of these structs. So for example:

struct a
{
  std::string sX;
  std::string sName;
};
struct b
{
  std::string sX;
  std::string sLocation;
};
struct c
{  
  std::string sX;
  std::string sPeople;
};

struct A_LESS
{
     bool operator () (const a& lhs , const a& rhs)
    {
        if (lhs.sX.size() != rhs.sX.size())
			return lhs.sX.size() > rhs.sX.size();
        return lhs.sX < rhs.sX;
    }
};

vector<a> vecA;
...all the rest are vectors, then data is read in.  Then in a function

b b_temp.sX = "xyz";
vector<a>::iterator it = std::lower_bound(vecA.begin(),
						vecA.end(),
						b_tmp,A_LESS());

My question is that all the structs have sX in them. Is it possible to create a template or something instead of having to make a new less than struct for each of the types of structs (a,b,c), so I can do std::lower_bound against all the structs (a,b,c)?