Re: [boost] [util] Any interest in address_of_first_nonarray_elem ?

Subject: Re: [boost] [util] Any interest in address_of_first_nonarray_elem ?
From: Krzysztof Czainski (1czajnik_at_[hidden])
Date: 2013-12-02 10:25:30

2013/12/2 Joaquin M Lopez Munoz <joaquin_at_[hidden]>

> Mostafa <mostafa_working_away <at> yahoo.com> writes:
>
> >
> > On Sun, 01 Dec 2013 23:56:41 -0800, Joaquin M Lopez Munoz <joaquin <at>
> tid.es>
> > wrote:
> > >
> > > Why the "non"? Shouldn't the name be "address_of_first_array_elem"?
> > > How is this different from std::begin(lhs)?
> >
> > No. The motivating use case for this were built-in multidimensional
> > arrays. I wanted a generic way to compare and copy them without resorting
> > to nested loops.
> >
> > For example:
> >
> >    typedef int ArrType[2][3];
> >
> >    ArrType a1 = { {0, 1, 2}, {3, 4, 5} };
> >    ArrType a2 = { {0, 1, 2}, {3, 4, 5} };
> >
> >    // Prints 0.
> >    std::cout << "Std Equal: " << std::equal(a1, a1 + 2, a2) << "\n";
> >    // Prints 1. Obviously address_of_first_nonarray_elem would be used
> > instead of subscripting.
> >    std::cout
> >      << "Flattened Std Equal: " << std::equal(a1[0], a1[0] + 6, a2[0])
>
> Ok, I got it now. The name is not very illuminating, maybe
> flat_begin/flat_end or a flat_view with begin/end/size would do better.

+1 for flat_view

Regards,
Kris