Hi,

I just want to know what type is the one returned by the .length property of an array.

Thanks.

Heinz wrote:
> Hi,
> 
> I just want to know what type is the one returned by the .length property of an array.
> 
> Thanks.

I think it's defined as an int (or possibly uint).  If you're concerned about 32/64 bit compatibility then it's recommended that you use "size_t".

http://www.digitalmars.com/d/portability.html

"Use size_t as an alias for an unsigned integral type that can span the address space. Array indices should be of type size_t."

-- 
- EricAnderton at yahoo

Heinz wrote:
> Hi,
> 
> I just want to know what type is the one returned by the .length property of an array.
> 
> Thanks.

Easiest way to achieve the array is either:

typeof(array.length) len;

or:

auto len = array.length;


You don't even have to really care for the type then, actually, and it stays platform independent, anyways.

Alexander Panek Wrote:

> Heinz wrote:
> > Hi,
> > 
> > I just want to know what type is the one returned by the .length property of an array.
> > 
> > Thanks.
> 
> Easiest way to achieve the array is either:
> 
> typeof(array.length) len;
> 
> or:
> 
> auto len = array.length;
> 
> 
> You don't even have to really care for the type then, actually, and it stays platform independent, anyways.

Hi, thanks for your reply, i really like what yo did but i need this type to be fixed, not stored in a variable. Ok, now len is the same type as array.length, then what's the type of len? you know what i mean?
The program knows the type but I need to know it too.
Thanks man.

Heinz wrote:
> Alexander Panek Wrote:
> 
>> Heinz wrote:
>>> Hi,
>>>
>>> I just want to know what type is the one returned by the .length property of an array.
>>>
>>> Thanks.
>> Easiest way to achieve the array is either:
>>
>> typeof(array.length) len;
>>
>> or:
>>
>> auto len = array.length;
>>
>>
>> You don't even have to really care for the type then, actually, and it stays platform independent, anyways.
> 
> Hi, thanks for your reply, i really like what yo did but i need this type to be fixed, not stored in a variable. Ok, now len is the same type as array.length, then what's the type of len? you know what i mean?
> The program knows the type but I need to know it too.
> Thanks man.
> 

size_t
(Which is 'uint' on 32b systems, and 'ulong' on 64b.)

-- Chris Nicholson-Sauls

Heinz wrote:
> Hi,
> 
> I just want to know what type is the one returned by the .length property of an array.
> 
> Thanks.

When in doubt, find out!

import std.stdio;

void main()
{
    char[] foo;
    writefln("typeof(array.length) == %s", typeid(typeof(foo.length)));
}

Daniel Keep Wrote:

> Heinz wrote:
> > Hi,
> > 
> > I just want to know what type is the one returned by the .length property of an array.
> > 
> > Thanks.
> 
> When in doubt, find out!
> 
> import std.stdio;
> 
> void main()
> {
>      char[] foo;
>      writefln("typeof(array.length) == %s", typeid(typeof(foo.length)));
> }

Cool man, thanks, this is what i need.

Chris Nicholson-Sauls Wrote:

> Heinz wrote:
> > Alexander Panek Wrote:
> > 
> >> Heinz wrote:
> >>> Hi,
> >>>
> >>> I just want to know what type is the one returned by the .length property of an array.
> >>>
> >>> Thanks.
> >> Easiest way to achieve the array is either:
> >>
> >> typeof(array.length) len;
> >>
> >> or:
> >>
> >> auto len = array.length;
> >>
> >>
> >> You don't even have to really care for the type then, actually, and it stays platform independent, anyways.
> > 
> > Hi, thanks for your reply, i really like what yo did but i need this type to be fixed, not stored in a variable. Ok, now len is the same type as array.length, then what's the type of len? you know what i mean?
> > The program knows the type but I need to know it too.
> > Thanks man.
> > 
> 
> size_t
> (Which is 'uint' on 32b systems, and 'ulong' on 64b.)
> 
> -- Chris Nicholson-Sauls

You're right. I wrote the array.length into a binary file and it uses only 4 bytes. Thanks.