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);

as one way to reverse sort. right?

Yes. Paul