I just moved a project that was using VC8, with TR1 supplied via BOOST, to VC9 with its own TR1 implementation. I was surprised that a unordered_map failed to compile with a great deal of verboseness because it didn't like my key type. I used a pair of two primitive types as the key. Boost took that just fine. But looking at the current Boost documentation for the hash object, (http://www.boost.org/doc/libs/1_40_0/doc/html/boost_tr1/subject_list.html#bo...) I see that the hash specializations include primitive types, strings, but not tuples. Is this something that changed between Boost 1_38 and 1_40, or an undocumented extension, or what? Why would the standard leave out that, when everyone and his neighbor will just supply their own generic definition. That is, is there a good reason for not doing it? --John TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.