On 3 March 2016 at 17:39, paul Fultz
On Wednesday, March 2, 2016 2:56 PM, Bjorn Reese < breese@mail1.stofanet.dk> wrote:
On 02/27/2016 05:16 PM, Vicente J. Botet Escriba wrote:
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
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?