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Subject: Re: [Boost-users] Question on std::binary_function template arguments
From: John M. Dlugosz (mpbecey7gu_at_[hidden])
Date: 2011-09-14 00:32:02

On 9/13/2011 11:38 AM, Nevin Liber wrote:
> On 13 September 2011 11:13, Dave Abrahams<dave_at_[hidden]> wrote:
>> I know this isn't the answer you're looking for, but IMO you should just
>> avoid std::binary_function and friends. They don't buy you anything you
>> can't get from embedding the typedefs directly, and they can inhibit the
>> empty base optimization.
> And they are deprecated in C++11 (along with mem_fun and mem_fun_ref,
> for that matter).


So what is the "best practice" for creating something that plays well with older compilers
that don't have decltype or all the C++11 features?

What kinds of things are first_argument_type and second_argument_type needed for?
I'm supposing that they would make bind smarter, work better perhaps, or give more
sensible error messages.

If mem_fun etc. are deprecated in favor of just using function and bind, then is there
also a general extension mechanism defined? That is, tell subsequent uses of bind just
what to do with first arguments of that nature?


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