On Sep 3, 2012, at 11:20 PM, Michel Morin wrote:
One can define BOOST_RESULT_OF_USE_DECLTYPE on compilers without decltype support and, in that case, TR1-style result_of is used. This is the behavior of the macro.
Once Eric changed this, but I claimed the regression and the change was reverted ( http://thread.gmane.org/gmane.comp.lib.boost.devel/230401/ ). In that thread, I might have over-emphasized the regression. If you think the effect of the code breakage is small enough, then I think it's OK to reapply Eric's change.
I followed this thread at the time. It seemed like you guys came to a reasonable resolution so I felt no need to comment. However, now that I'm going over the documentation again I'm having second thoughts. The documentation actually states that BOOST_RESULT_OF_USE_DECLTYPE can be used to force the use of decltype. As Nathan and others pointed out at the time, forcing the use of decltype on a compiler that doesn't have it can be viewed as a logical error, which is probably the right way to look at it. I think Eric's original change was correct and should be reapplied. - Daniel