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Stack-based's Limitation

1 reply on 1 page. Most recent reply: Apr 19, 2004 11:08 AM by Mike Swaim

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le Thuy

Posts: 1
Nickname: lequang
Registered: Nov, 2003

Stack-based's Limitation Posted: Nov 27, 2003 10:47 AM
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Can anyone explain why a funtion cannot construct any data structure whose size is not known to the caller on the stack?
Is it because of the stack structure? Is there any mechanism that languages use to overcome this limitation?
thank you


Mike Swaim

Posts: 13
Nickname: swami
Registered: Apr, 2004

Re: Stack-based's Limitation Posted: Apr 19, 2004 11:08 AM
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> Can anyone explain why a funtion cannot construct any data
> structure whose size is not known to the caller on the
> stack?
> Is it because of the stack structure?
Yes. Objects are located contiguously on the stack. If the caller doesn't know how big the object is, it can't know how much space to reserve, can it?

> Is there any
> mechanism that languages use to overcome this limitation?
Pointers. (Or object references.)

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