container class for using a struct in std::vector<>

I have a std::vector< ICMP_ECHO_REPLY > container that I'd like to be
able to do such wonderful STL operations as max_element(),
accumulate(), greater_equal(), etc... So, I decided I would create a
class to contain that information and overload the necessary operators.

The idea is that I should be able to do something like this:

std::vector< ICMP_ECHO_REPLY > container;
ICMP_ECHO_REPLY reply;
//...
container.push_back( reply );
//...
std::vector< ICMP_ECHO_REPLY >::const_iterator itMax = max_element(
container.begin() container.end() );

Thus far, I've got something like the class below, but I the error:
error C2678: binary '<' : no operator found which takes a left-hand
operand of type 'const CEchoReply' (or there is no acceptable
conversion)

So, first, I'd like to know if there is a better way of doing this.
Second, what is it I'm doing wrong here?

Thanks,
 PaulH

class CEchoReply
{
public:
    ICMP_ECHO_REPLY _reply;
    CEchoReply()
    {
        ZeroMemory( &_reply, sizeof( ICMP_ECHO_REPLY ) );
    };
    CEchoReply( const ICMP_ECHO_REPLY& reply )
    {
        memcpy( &_reply, &reply, sizeof( ICMP_ECHO_REPLY ) );
    };
    ~CEchoReply()
    {
    };
    operator ICMP_ECHO_REPLY() const { return _reply; };
    bool operator < ( const ICMP_ECHO_REPLY& lhs )
    {
        return lhs.RoundTripTime < _reply.RoundTripTime;
    };

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};