• Miguel L (18/18) Jul 11 2017 Hi
• Miguel L (4/22) Jul 11 2017 Sorry, this post is duplicated. Yesterday forum was not working
• Adam D. Ruppe (25/33) Jul 12 2017 Then just don't change the length... this is a correct way to do
• Jack Applegame (6/8) Jul 12 2017 void foo(size_t N)(ref int[N] arr) {
• Miguel L (2/10) Jul 12 2017 Thank you very much for your answers.

Miguel L <mlabayru gmail.com> writes:

Hi

I need to create a non-dynamic array like this

void f(int x)
{
int[x] my_array;
...

this does not compile as x value needs to be known at compile 
time. The closest to this I can get is:

void f(int x)
{
int[] my_array;
my_array.length=x;

but I don't really need a dynamic array as length is not going to 
change inside f.

What is the best way to do this?

Also what is it possible in D to write a function that accepts an 
static array of any size?

Thanks in advance

Miguel L <mlabayru gmail.com> writes:

On Wednesday, 12 July 2017 at 05:45:13 UTC, Miguel L wrote:
 Hi

 I need to create a non-dynamic array like this

 void f(int x)
 {
 int[x] my_array;
 ...

 this does not compile as x value needs to be known at compile 
 time. The closest to this I can get is:

 void f(int x)
 {
 int[] my_array;
 my_array.length=x;

 but I don't really need a dynamic array as length is not going 
 to change inside f.

 What is the best way to do this?

 Also what is it possible in D to write a function that accepts 
 an static array of any size?

 Thanks in advance

Sorry, this post is duplicated. Yesterday forum was not working 
and i received an error when i was trying to post it. Please 
ignore it.

Adam D. Ruppe <destructionator gmail.com> writes:

On Wednesday, 12 July 2017 at 05:45:13 UTC, Miguel L wrote:
 void f(int x)
 {
 int[] my_array;
 my_array.length=x;

 but I don't really need a dynamic array as length is not going 
 to change inside f.

Then just don't change the length... this is a correct way to do 
it.

You could also allocate it with `alloca` or `malloc` depending on 
exact use.

I also sometimes like to just slice a static array:

```
void f(int x) {
    int[1000] buffer;
    int[] my_array = x < buffer.length ? buffer[0 .. x] : new 
int[](x);
}
```

Which gives the speed benefits of static without putting a size 
limit on it.

Just make sure you keep track of ownership with any of these 
strategies.

 Also what is it possible in D to write a function that accepts 
 an static array of any size?

Best option is to just accept a slice:

void f(int[] x);


and call it like so:

int[123] some_static_array;
f(some_static_array[]);


That will work on any size and typically give best performance. 
Again though, just use caution about ownership when using static 
arrays.

Jack Applegame <japplegame gmail.com> writes:

On Wednesday, 12 July 2017 at 05:45:13 UTC, Miguel L wrote:
 Also what is it possible in D to write a function that accepts 
 an static array of any size?

void foo(size_t N)(ref int[N] arr) {
     ...
}

int[10] arr;
foo(arr);

Miguel L <mlabayru gmail.com> writes:

On Wednesday, 12 July 2017 at 18:49:23 UTC, Jack Applegame wrote:
 On Wednesday, 12 July 2017 at 05:45:13 UTC, Miguel L wrote:
 Also what is it possible in D to write a function that accepts 
 an static array of any size?

 void foo(size_t N)(ref int[N] arr) {
     ...
 }

 int[10] arr;
 foo(arr);

Thank you very much for your answers.