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#boost_tr1.subject_list.hash>)
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
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