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

Subject: Re: [boost] [util] Any interest in address_of_first_nonarray_elem ?
From: Joaquin M Lopez Munoz (joaquin_at_[hidden])
Date: 2013-12-02 05:34:15

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.

Joaquín M López Muñoz
Telefónica Digital