www.digitalmars.com         C & C++   DMDScript  

D - Allocate a struct on the heap?

reply Russ Lewis <spamhole-2001-07-16 deming-os.org> writes:
I feel kind of stupid to ask, since (I guess) this should be simple, but
how do you allocate a single instance of a struct on the heap?  new
doesn't work, giving the error "Error: new can only create arrays or
class objects, not <structName>'s".

I know, I could allocate an array of length 1, but what I really want is
a pointer, not an array (I'm going to cast it to a void pointer soon,
and send it flying through C-space...)

--
The Villagers are Online! villagersonline.com

.[ (the fox.(quick,brown)) jumped.over(the dog.lazy) ]
.[ (a version.of(English).(precise.more)) is(possible) ]
?[ you want.to(help(develop(it))) ]
Sep 20 2002
parent reply Russell Lewis <spamhole-2001-07-16 deming-os.org> writes:
Russ Lewis wrote:

 I feel kind of stupid to ask, since (I guess) this should be simple, but
 how do you allocate a single instance of a struct on the heap?  new
 doesn't work, giving the error "Error: new can only create arrays or
 class objects, not <structName>'s".
 
 I know, I could allocate an array of length 1, but what I really want is
 a pointer, not an array (I'm going to cast it to a void pointer soon,
 and send it flying through C-space...)
 
 --
 The Villagers are Online! villagersonline.com
 
 .[ (the fox.(quick,brown)) jumped.over(the dog.lazy) ]
 .[ (a version.of(English).(precise.more)) is(possible) ]
 ?[ you want.to(help(develop(it))) ]



Any thoughts on this, anybody?
Sep 23 2002
parent reply Patrick Down <pat codemoon.com> writes:
Russell Lewis <spamhole-2001-07-16 deming-os.org> wrote in 
news:3D8F7EB9.8050305 deming-os.org:


 Russ Lewis wrote:

 I feel kind of stupid to ask, since (I guess) this should be simple, 







 how do you allocate a single instance of a struct on the heap?  new
 doesn't work, giving the error "Error: new can only create arrays or
 class objects, not <structName>'s".
 
 I know, I could allocate an array of length 1, but what I really want 







 a pointer, not an array (I'm going to cast it to a void pointer soon,
 and send it flying through C-space...)



 Any thoughts on this, anybody?



struct Foo
{
  int a;
  int b;
}

int main(char[][] argv)
{ 
  Foo* pFoo = new Foo[1];
  
  return 0;
}
Sep 23 2002
parent reply Russell Lewis <spamhole-2001-07-16 deming-os.org> writes:
Patrick Down wrote:

 Russell Lewis <spamhole-2001-07-16 deming-os.org> wrote in 
 news:3D8F7EB9.8050305 deming-os.org:
 
 

Russ Lewis wrote:


I feel kind of stupid to ask, since (I guess) this should be simple, 






 

how do you allocate a single instance of a struct on the heap?  new
doesn't work, giving the error "Error: new can only create arrays or
class objects, not <structName>'s".

I know, I could allocate an array of length 1, but what I really want 






 

a pointer, not an array (I'm going to cast it to a void pointer soon,
and send it flying through C-space...)



Any thoughts on this, anybody?



 
 struct Foo
 {
   int a;
   int b;
 }
 
 int main(char[][] argv)
 { 
   Foo* pFoo = new Foo[1];
   
   return 0;
 }
  
 



But why???
Sep 23 2002
parent reply Patrick Down <pat codemoon.com> writes:
Russell Lewis <spamhole-2001-07-16 deming-os.org> wrote in 
news:3D8FAF8B.2050907 deming-os.org:

 
 But why???



You mean why can't you just do

Foo* p = new Foo; //??

I don't know. <g> new Foo[1] seems
pretty much the same to me.  It 
creates a block of heap memory
large enough to hold one Foo.
Sep 23 2002
parent "Walter" <walter digitalmars.com> writes:
Looks like a compiler bug to me. -Walter

"Patrick Down" <pat codemoon.com> wrote in message
news:Xns9292CBA453F87patcodemooncom 63.105.9.61...

 Russell Lewis <spamhole-2001-07-16 deming-os.org> wrote in
 news:3D8FAF8B.2050907 deming-os.org:

 But why???



 You mean why can't you just do

 Foo* p = new Foo; //??

 I don't know. <g> new Foo[1] seems
 pretty much the same to me.  It
 creates a block of heap memory
 large enough to hold one Foo.
Sep 24 2002