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Old 03-07-2004, 02:32 PM   #1
a1ghagh05t
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dynamically expanding an array in c++


Hey,
I've got this pointer that I want to point to an array of pointers of length X. This array may get full so I may want to create a new one of length 2 * X and copy all the stuff from the original one into this new one. I'm doing this in C++ and whenever I declare the array...
void* asdf[ X ];
I get an error complaining that X isn't constant. So, I've been trying to work the "const" in there but I still can't get through this one. Thanks,
mj
 
Old 03-07-2004, 03:19 PM   #2
jbstew32
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Have you tried looking at vectors? I don't know how common they are in C++ or if there are better alternatives, but it holds a resize() function that seems to do all the work for you.
 
Old 03-07-2004, 03:22 PM   #3
meldar
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Look at http://www.codeguru.com/Cpp/Cpp/cpp_...cle.php/c4027/
 
Old 03-07-2004, 04:11 PM   #4
Stack
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you need to use "new"
 
Old 03-07-2004, 09:00 PM   #5
haobaba1
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Re: dynamically expanding an array in c++

Quote:
Originally posted by a1ghagh05t
Hey,
I've got this pointer that I want to point to an array of pointers of length X. This array may get full so I may want to create a new one of length 2 * X and copy all the stuff from the original one into this new one. I'm doing this in C++ and whenever I declare the array...
void* asdf[ X ];
I get an error complaining that X isn't constant. So, I've been trying to work the "const" in there but I still can't get through this one. Thanks,
mj
void** asdf= new *void[x];

or you can write in c and compile with gcc which allows non-constant array declarations.
 
  


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