Re: [boost] [Fit] upcoming formal review for Boost.Fit

3 Mar 2016

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On Thursday, March 3, 2016 12:36 PM, Sam Kellett  wrote:
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On 3 March 2016 at 17:39, paul Fultz  wrote:
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On Wednesday, March 2, 2016 2:56 PM, Bjorn Reese <
 breese@mail1.stofanet.dk> wrote:
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On 02/27/2016 05:16 PM, Vicente J. Botet Escriba wrote:
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Documentation:http://pfultz2.github.io/Fit/doc/html/
In More Examples / Projections there is this example:
std::sort(std::begin(people), std::end(people),
             by(&Person::year_of_birth, _ < _));
That strikes me as a very terse syntax, where the reader could easily
miss the fact that two values are being compared. Have you considered
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the use of placeholders like _1 and _2 instead?
They are already supported. The anonymous placeholders are only there to
 describe an operator(they are not bind expressions). It could also be
 written
 like this as well:
std::sort(std::begin(people), std::end(people),
 by(&Person::year_of_birth, std::less_than<>()));
The clarity of two parameters being passed to `std::less_than` is just as
 clear as when using the anonymous placeholders. The advantage of writing
`_ < _` is that it is generic, SFINAE and constexpr friendly.
so if i understand correctly, that means that this work:
std::sort(std::begin(people), std::end(people), by(&Person::year_of_birth,
_2 < _1);

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as one way to reverse sort. right?
Yes.

Paul