Re: Array Slicing

2020-09-29 Thread DMon via Digitalmars-d-learn 

On Sunday, 27 September 2020 at 14:25:34 UTC, H. S. Teoh wrote:
On Sun, Sep 27, 2020 at 01:59:07PM +, DMon via 
Digitalmars-d-learn wrote:

Are these in the Specification or Phobos?


See: https://dlang.org/articles/d-array-article.html


T


Or in Articles?

Thanks, Teoh.

Re: Array Slicing

2020-09-27 Thread H. S. Teoh via Digitalmars-d-learn 
On Sun, Sep 27, 2020 at 01:59:07PM +, DMon via Digitalmars-d-learn wrote:
> Are these in the Specification or Phobos?

See: https://dlang.org/articles/d-array-article.html


T

-- 
Государство делает вид, что платит нам зарплату, а мы делаем вид, что работаем.

Array Slicing

2020-09-27 Thread DMon via Digitalmars-d-learn 
Are these in the Specification or Phobos? I figured them out a 
few days ago. These are from my snippet journal on arrays and 
there may be more.


void main()
{
int[5] a = [1, 2, 3, 4, 5];
int[5][3] b = [[6, 7, 8, 9, 10], [11, 12, 13, 14, 15], [16, 
17, 18, 19, 20]];

int[5] c;

// This:
writeln(a[1..4][0]);
writeln(b[0][1..4]);
writeln(b[1][1..4][2]);
//writeln(b[0..1][1..3]); // Range violation.
//writeln(a[$-2..$-3]); // NG.
writeln(a[$-3..$-2])

// And, this:
c[0..5] = a[0..$-0]
writeln(c);
}

My apologizes, if any if these are noted or wrong.

Re: Can i get a array Slicing where the top from?and how?

2016-03-31 Thread Ali Çehreli via Digitalmars-d-learn 

On 03/30/2016 11:39 PM, Dsby wrote:
> Like this:
>
> ubyte[] fun()
> {
>  ubyte[] str = cast(ubyte[])"hello world";
>  ubyte[] by = Mallocator.instance.allocate(str.length);
>  by[] = str[];
>  return by[5..$];
> }
>
> void mian()
> {
>  ubyte[] aa = fun();
> // i want free the aa's momeny.
> //Mallocator.instance.deallocate(aa);// it is erro, aa.ptr != by.ptr?
>   // can I get the by's ptr and length?
> }
>
>
> can I get "by" in main function by aa?
> i can get the way?is it possible ？

No, you can't.

Normally, you would have a cleanup function that corresponds to fun(), 
which the users call when they're done with their resources.


void foo_cleanup(ubyte[] by) {
// Do your magic here to find the original pointer.
// For example, you can use an AA to map from
// by.ptr to the original pointer.
}

Ali

Can i get a array Slicing where the top from?and how?

2016-03-30 Thread Dsby via Digitalmars-d-learn 

Like this:

ubyte[] fun()
{
ubyte[] str = cast(ubyte[])"hello world";
ubyte[] by = Mallocator.instance.allocate(str.length);
by[] = str[];
return by[5..$];
}

void mian()
{
ubyte[] aa = fun();
   // i want free the aa's momeny.
   //Mallocator.instance.deallocate(aa);// it is erro, aa.ptr != 
by.ptr?

 // can I get the by's ptr and length?
}


can I get "by" in main function by aa?
i can get the way?is it possible ？