Eric Niebler wrote:
David Abrahams wrote:
Eric Niebler wrote:
The Phoenix/Proto port in (Phoenix v3) uses BOOST_TYPEOF to deduce the the type of expressions involving operators, with the exception of the function call operator. For the function call operator, Phoenix v3 uses result_of to calculate the return type.
Interesting. Kinda makes sense, but could you explain the rationale anyway?
You mean, the rationale for using result_of instead of BOOST_TYPEOF for the function call operator? BOOST_TYPEOF can't perfectly distinguish between lvalues and rvalues.
Yeah, that's my basic problem with BOOST_TYPEOF. I fudge it where I have to, Where do you fudge it? if_then expression? How? How about ordinary operators like a + b? Do you simply not allow weird uses like: X& operator+(A a, B b) return a reference?? Regards, -- Joel de Guzman http://www.boostpro.com http://spirit.sf.net