Hi

I am trying to implement a D2 function that has this C signature (it gets called from a C module and I cannot change the caller):

extern(C) read_into(char *buffer, size_t buf_len);

I would like to use D's vector (or array-wise according to TDPL) operations on buffer but I cannot find a way, how I could initialize a (static?) D array and tell it to use buffer as its memory. Obviously I don't want to copy buffer in a regular D array to be able to do the manipulations and than having to copy everything back into buffer.

Is there any way to get this accomplished?


Thanks,

Lars

On Mon, 28 Feb 2011 19:51:28 +0300, Lars Holowko <lars.holowko@gmail.com> wrote:

> Hi
>
> I am trying to implement a D2 function that has this C signature (it
> gets called from a C module and I cannot change the caller):
>
> extern(C) read_into(char *buffer, size_t buf_len);
>
> I would like to use D's vector (or array-wise according to TDPL)
> operations on buffer but I cannot find a way, how I could initialize a
> (static?) D array and tell it to use buffer as its memory. Obviously I
> don't want to copy buffer in a regular D array to be able to do the
> manipulations and than having to copy everything back into buffer.
>
> Is there any way to get this accomplished?
>
>
> Thanks,
>
> Lars

Here you go:

auto arr = buffer[0..buf_len];

Now you can operate on this array however you like. E.g.

arr[] = 0; // initialize with zeros

> I am trying to implement a D2 function that has this C signature (it
> gets called from a C module and I cannot change the caller):
>
> extern(C) read_into(char *buffer, size_t buf_len);
>
> I would like to use D's vector (or array-wise according to TDPL)
> operations on buffer but I cannot find a way, how I could initialize a

auto darray = buffer[0 .. buf_len]

On 2/28/2011 10:15 AM, Denis Koroskin wrote:
> On Mon, 28 Feb 2011 19:51:28 +0300, Lars Holowko
> <lars.holowko@gmail.com> wrote:
>
>> gets called from a C module and I cannot change the caller):
>>
>> extern(C) read_into(char *buffer, size_t buf_len);
>>
>> I would like to use D's vector (or array-wise according to TDPL)
>> operations on buffer but I cannot find a way, how I could initialize a
>> (static?) D array and tell it to use buffer as its memory. Obviously I
>
> Here you go:
>
> auto arr = buffer[0..buf_len];
>
> Now you can operate on this array however you like. E.g.
>
> arr[] = 0; // initialize with zeros

Thanks Denis and Trass3r,

that was embarrasingly easy ;-)