Thread: Large Arrays

Are you allocating it dynamically or statically?

You should use pointers and dynamic memory. Static arrays are created at compile time and have direct impact on the size of your executable. I can only guess that your compiler limited your array size and that causes a crash.

Do something like...

Code:

byte *pByte;
pByte= new byte[4294967296];


....

pByte[<position>] = <value>;

and...

Code:

delete [] pByte;

when you're done with it.

edit: those semicolons always...

>>Static arrays are created at compile time and have direct impact on the size of your executable.
No they don't. They just suck up stack space, which is very limited.

Originally posted by XSquared
>>Static arrays are created at compile time and have direct impact on the size of your executable.
No they don't. They just suck up stack space, which is very limited.

edit: I guess I was wrong then. Maybe that was the way it was done in Delphi. Anyway, doesn't matter....

You can create the array in one of the first lines of your code and delete it when the program terminates.

Instead of new and delete you could use malloc/calloc/realloc and free, but it's just another way to allocate dynamic memory and it is not safe for objects.


Another way would be to implement a class that does the allocation and deletion for you. You could than statically create an instance of the class and wouldn't need to take care of new/delete. That class would delete the memory in it's destructor which will be automatically called on program termination.

edit: A vector (#include <vector>) is a templated class that does something very similar. You can use it almost like an array, but I don't know how fast it is. I guess sequential appending to a vector with push_back could be pretty slow, but it also allows you to set it's size and then assign elements.

Have a look here