Re: [Boost-users] multi_array with large dimensions crashes

24 Aug 2011

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Is this line correct it get compile errors at this line
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array_ref_type::size_type xDim(500), yDim(300), zDim(400);
It seems ok to me, and compiles on gcc. However, I am not familiar with
other compilers...

Maybe try to replace it with:

typedef array_ref_type::size_type size_type;
size_type xDim(500);
size_type yDim(300);
size_type zDim(400);

or, if it still does not work:

typedef unsigned int size_type;
size_type xDim = 500;
size_type yDim = 300;
size_type zDim = 400;

Pierre-André

On Wed, Aug 24, 2011 at 11:18 AM, Jothy  wrote:
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Thanks very much Pierre.
Is this line correct it get compile errors at this line
array_ref_type::size_type xDim(500), yDim(300), zDim(400);
should it be like int(300) or float(300), some thing lie that
Jothy
On Wed, Aug 24, 2011 at 3:51 PM, Pierre-Andre Noel <
noel.pierre.andre@gmail.com> wrote:
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I am not familiar with multi_array, but it seems that you are creating
a >1GB object on the stack. This will almost always crash. Try creating it
on the heap instead. Be prepared for std::bad_alloc.
...
But how to do this? I am new to c++.
I suggest you to either 1. read on the operators "new" and "delete" or 2.
use a std::vector to allocate the memory then use a boost::multi_array_ref
to refer to it. Here's an example:
#include <vector>
#include 
int main()
{
  typedef float data_type;
  typedef std::vector array_storage_type;
  typedef boost::multi_array_ref array_ref_type;
array_ref_type::size_type xDim(500), yDim(300), zDim(400);
  array_storage_type Storage(xDim*yDim*zDim);
  array_ref_type Array(&Storage.front(),boost::extents[xDim][yDim][zDim]);
  // You may now use Array as usual.
}
Hope it helps,
Pierre-André Noël
On Wed, Aug 24, 2011 at 5:20 AM, Jothy  wrote:
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Thanks for pointing this out.
But how to do this? I am new to c++.
Jothy
On Tue, Aug 23, 2011 at 10:42 PM, Juraj Ivančić 
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wrote:
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On 23.8.2011. 12:18, Jothy wrote:
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Hi all,
I have just started to use boost libs. I am trying to create a large
float array (mandatory for my purpose). it works fine till certain
limit, but crashes above that. I think it about allocating memory in
the
stack.
My code is like this
typedefboost::multi_array<**float,3>array_type;
typedefarray_type::indexindex;
array_typeArray(boost::**extents[xDim][yDim][zDim]);//**500,300,400
for instance
Can some one help me to resolve this?
...
1GB object on the stack. This will almost always crash. Try creating it on
I am not familiar with multi_array, but it seems that you are creating a
the heap instead. Be prepared for std::bad_alloc.
HTH
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