[boost] [Typeof] Why not use decltype?

From: Doug Gregor (dgregor_at_[hidden])
Date: 2007-07-27 14:33:55

The Boost.Typeof library does a lot of work to determine the type of  
an expression. At last week's meeting, the C++ committee voted to add  
"decltype" into the C++0x standard. decltype is what we want from  
typeof: a proper, reference-preserving way to get the type of an  
arbitrary expression.

As of today, GCC 4.3's experimental C++0x mode contains support for  
decltype. I have updated the Boost Config library (on the CVS trunk)  
to contain BOOST_HAS_DECLTYPE, indicating the presence of decltype. A  
sufficiently-motivated person could certainly use this macro to give  
a simple implementation of decltype for C++0x compilers...

There is nightly testing of Boost's trunk on the latest version of  
GCC 4.3 (also built nightly), so we will get appropriate testing of C+ 
+0x features throughout Boost.

        - Doug