Re: [boost] [yap] Review

Subject: Re: [boost] [yap] Review
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2018-02-13 18:51:47

AMDG

On 02/13/2018 09:47 AM, Zach Laine via Boost wrote:
> On Tue, Feb 13, 2018 at 11:30 AM, Steven Watanabe via Boost <
> boost_at_[hidden]> wrote:
> 
>> On 02/12/2018 06:57 PM, Zach Laine via Boost wrote:
>>> On Mon, Feb 12, 2018 at 4:15 PM, P F via Boost <boost_at_[hidden]>
>>> wrote:
>>>
>>>> You could also get rid of the need for `::user_expr`
>>>
>>>
>>> We actually want that.  It's often necessary to be able to return an
>>> expression created from some template different than the template
>> defining
>>> he operator.
>>>
>>
>>   If that's really important then why doesn't
>> BOOST_YAP_USER_FREE_BINARY_OPERATOR take two
>> expr_template parameters?
> 
> 
> Because there's only one result.   The expr_template parameter governs how
> the result is constructed, not which inputs are accepted.
> 

  Doesn't this make BOOST_YAP_USER_FREE_BINARY_OPERATOR
unusable, since expression already uses it, so using it
again with a different ExpressionTemplate would be ambiguous?

In Christ,
Steven Watanabe