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From: Peter Dimov (pdimov_at_[hidden])
Date: 2007-04-27 19:40:13

Eric Niebler wrote:
> Peter Dimov wrote:
>> Eric Niebler wrote:
>>> Although I don't know all the details of bind and lambda, I had
>>> hoped that _1 and _2 would be abstract proto entities, such that
>>> _1 == _2
>>> creates an expression template like:
>>> equal< terminal< arg<1> >, terminal< arg<2> > >
>>> which is a generic, abstract representation of an equals expression
>>> with two placeholders. Can't bind and lambda both be implemented to
>>> recognize such a type and do the appropriate thing with it?
>> Possibly, if they are made to honor is_bind_expression
>> specializations and result_of, if is_bind_expression reports true
>> for the above type, if the above is a function object that actually
>> returns x == y, and if result_of works for it.
> Yes, that can all be made to work without much difficulty.

The part about boost::bind using is_bind_expression and result_of cannot,
not without major surgery and possibly compromising portability.

Sometimes I get excited about the new C++0x features and tell myself, why
not rewrite boost::bind to take advantage of them? Then it occurs to me that
C++0x has a std::bind built-in. :-) (Happened twice so far.)

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