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digitalmars.D.learn - Type of Array.length?

reply Heinz <billgates microsoft.com> writes:
Hi,

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

Thanks.
Jan 19 2007
next sibling parent Pragma <ericanderton yahoo.removeme.com> writes:
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
Jan 19 2007
prev sibling next sibling parent reply Alexander Panek <a.panek brainsware.org> writes:
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.
Jan 19 2007
parent reply Heinz <billgates microsoft.com> writes:
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.
Jan 19 2007
parent reply Chris Nicholson-Sauls <ibisbasenji gmail.com> writes:
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
Jan 19 2007
parent Heinz <billgates microsoft.com> writes:
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.
Jan 20 2007
prev sibling parent reply Daniel Keep <daniel.keep+lists gmail.com> writes:
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)));
}
Jan 20 2007
parent Heinz <billgates microsoft.com> writes:
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.
Jan 20 2007