Hi, Here is what I am trying to do typedef DWORD DSIid; enum DSType { DSTypeNone = 0, DSTypeBegin, DSTypeRoot } struct SDSIOwnedByKey { SDSIOwnedByKey(DSType DSTypeOwned, DSIid DSIidOwned, DSType DSTypeOwner, DSIid DSIidOwner) : m_DSTypeOwned(DSTypeOwned), m_DSIidOwned(DSIidOwned), m_DSTypeOwner(DSTypeOwner), m_DSIidOwner(DSIidOwner) { } bool operator == (const SDSIOwnedByKey &rcComp) const { return m_DSTypeOwned == rcComp.m_DSTypeOwned && m_DSIidOwned == rcComp.m_DSIidOwned && m_DSTypeOwner == rcComp.m_DSTypeOwner && m_DSIidOwner == rcComp.m_DSIidOwner; } DSType m_DSTypeOwned; DSIid m_DSIidOwned; DSType m_DSTypeOwner; DSIid m_DSIidOwner; }; class DataStore { typedef boost::multi_index_container< SDSIOwnedByKey, boost::multi_index::indexed_by< boost::multi_index::ordered_unique<boost::multi_index::tag<ByOwnedTypeOw nerTypeOwnerIdOwnedId>, boost::multi_index::composite_key<SDSIOwnedByKey, boost::multi_index::member<SDSIOwnedByKey, DSType, &SDSIOwnedByKey::m_DSTypeOwned>, boost::multi_index::member<SDSIOwnedByKey, DSType, &SDSIOwnedByKey::m_DSTypeOwner>, boost::multi_index::member<SDSIOwnedByKey, DSIid, &SDSIOwnedByKey::m_DSIidOwner>, boost::multi_index::member<SDSIOwnedByKey, DSIid, &SDSIOwnedByKey::m_DSIidOwned> >, boost::multi_index::composite_key_compare<std::less<DSType>,std::less<DS Type>, std::less<DSIid>, std::greater<DSIid>> > >
TOwnedBySort;
typedef typename TOwnedBySort::index<ByOwnedTypeOwnerTypeOwnerIdOwnedId>::type OwnedBySort_ByOwnedTypeOwnerTypeOwnerId; TOwnedBySort m_oOwnedBySort; }; Instead of >, boost::multi_index::composite_key_compare<std::less<DSType>,std::less<DS Type>, std::less<DSIid>, std::greater<DSIid>> I want to write a compare function that compared all the values in one function, like a complete record comparison something like >, boost::multi_index::composite_key_compare<SDSIOwnedByKey> And have an appropriate function which would get the whole record to compare Thanks Brijesh