Fwd: Re: [Dev-C++] Multidimensional arrays and memory leaks

[Paul I. <pi...@ot...>]

>Hi,
>
>Since I tried to use a 2D array "number[50000][2]" I started to have ran=
dom
>=20
>crashes at run time and debugging.=20
>
>I guess this is a memory handling problem (what do you think?).

Sure, if you declared it like that.=20

Windows uses a dynamically growing stack. Just above the top of the stack=
 there
is a read-only area. When the stack is growing (in resonable increments) =
there
will be a write to this area triggering an exception. This exception tell=
s
windows to increase the size of the stack, moving forward the stack-need-=
to-grow
read-only area.=20

Now if you declare something really big, there is a chance that you will =
make a
memory access missing the availabe stack (including the protective area).

(This is absolutly not a windows-specific problem, BTW. Just about the sa=
me
everywhere...)


> Thus, I tried
>to put the array in the heap (would that help?). However I tried many wa=
y to
>do=20
>it without success.=20
>
>I declared the array in the header of a class as:
>
>float number[][];
>
>Then I tried to put it in the heap using GlobalAlloc in the constructor.=
=20

GlobalAlloc ?? Thats some antique windows-API function from the 80286 day=
s is't
it? Why not use new?

number =3D new float[50000*2];



/Paul

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