Hello, I require a pm which returns passed key (itself or a 'part' of it) as mapped value. For this purpose I wrote another helper since boost::put_get_helper's put function passes keys by value. // Pasted as a reminder template <class PropertyMap, class Reference, class K, class V> inline void put(const put_get_helper<Reference, PropertyMap>& pa, K k, const V& v) { static_cast<const PropertyMap&>(pa)[k] = v; } Is there any way to accomplish this by not introducing another custom helper ? (may be there already something similar exists in boost) Thanks. -- View this message in context: http://boost.2283326.n4.nabble.com/Property-Map-put-get-helper-keys-are-pass... Sent from the Boost - Dev mailing list archive at Nabble.com.