Re: [boost] [concept] EqualityComparable metafunction

Subject: Re: [boost] [concept] EqualityComparable metafunction
From: Jeffrey Lee Hellrung, Jr. (jeffrey.hellrung_at_[hidden])
Date: 2011-09-14 14:22:03

2011/9/14 Frédéric Bron <frederic.bron_at_[hidden]>

> I am working on it right now and wanted to publish the new names with
> a new version in the sandbox, ready to be included. But yes the result
> is C plus an additionnal has_unary_minus (see below).
> Frédéric
>
> # binary
> +       has_plus
> -       has_minus
> *       has_multiplies
> /       has_divides
> %       has_modulus
> +=      has_plus_assign
> -=      has_minus_assign
> *=      has_multiplies_assign
> /=      has_divides_assign
> %=      has_modulus_assign
> &       has_bit_and
> |       has_bit_or
> ^       has_bit_xor
> &=      has_bit_and_assign
> |=      has_bit_or_assign
> ^=      has_bit_xor_assign
> <<      has_left_shift
> >>      has_right_shift
> <<=     has_left_shift_assign
> >>=     has_right_shift_assign
> ==      has_equal_to
> !=      has_not_equal_to
> <       has_less
> <=      has_less_equal
> >       has_greater
> >=      has_greater_equal
> &&      has_logical_and
> ||      has_logical_or
> # prefix
> !       has_logical_not
> +       has_unary_plus
> -       has_unary_minus
> -       has_negate
> ~       has_complement
> *       has_dereference
> ++      has_pre_increment
> --      has_pre_decrement
> # postfix
> ++      has_post_increment
> --      has_post_decrement
>

I notice (just now) that unary & and [] are absent.  Detection of operator[]
needs an entirely different mechanism than the above operators, so I
understand its absence (but maybe it could still be included?).  I'm not
sure detection of unary operator& would be all that useful most of the time,
but I'm just wondering what the reasons were for its exclusion.

FWIW, I couldn't find answers to the above questions from browsing the
(obviously outdated) documentation in sandbox/type_traits.  If there's
updated documentation browsable online that address this, feel free to just
direct me there :)

- Jeff