If we define BOOST_RESULT_OF_USE_DECLTYPE, boost::result_of tries to use decltype-based implementation even on C++03 compilers. This causes compilation errors and it is a regression on C++03 compilers.
Is it intentional change?
I did intend this change.
I think this breaks too much code. Every code that (directly or indirectly) includes boost::result_of with `#define BOOST_RESULT_OF_USE_DECLTYPE` breaks in C++03.
Why would you ask result_of to use decltype when you don't have it?
+1 Defining BOOST_RESULT_OF_USE_DECLTYPE when your compiler doesn't support decltype seems like a logic error to me. I would rather be alerted to logic errors than have an explicit instruction (defining BOOST_RESULT_OF_USE_DECLTYPE) be ignored to work around them. Regards, Nate