how to remove crash due to bad pointer?

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Hi, in my code there are variables which always lead to crash because they get corrupted and become bad pointers.
How to i resolve this ?

Posted 27-Jun-12 18:07pm

Charmy from bangalore

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[no name] 28-Jun-12 0:17am

This question is too general. It requires more information. Perhaps you could post a code sample to improve the question.

Sergey Alexandrovich Kryukov 28-Jun-12 1:25am

Remove? Crash? Ever head or entropy? :-)
--SA

Sergey Alexandrovich Kryukov 28-Jun-12 1:27am

OK, this is a totally pointless question. Try to provide proper description of the problem, use "Improve question" above.
--SA

Mohibur Rashid 28-Jun-12 1:41am

Those rule I putted was not rule. Its some very basic(not advance) to avoid simple mistakes

Sergey Alexandrovich Kryukov 29-Jun-12 18:33pm

Cannot understand what are you talking about, sorry. You really need to provide essential detail, create and post a code sample, something informative.
--SA

Malli_S 28-Jun-12 5:25am

It would be better, if you could post that code.

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Aescleal · Answer 1 · 2012-06-27T21:57:00

Some ways of resolving this one are:

- don't to write to memory that your process doesn't own by
- making sure you don't write beyond the end of buffers
- initialising everything
- use standard algorithms to access collections

- don't manually manage memory, it's a mugs game these days
- use std::vector, std::shared_ptr and std::unique_ptr instead of raw pointers

Basically don't break the rules or idioms of the language and you'll be okay.

Eugen Podsypalnikov · Answer 2 · 2012-06-27T22:07:00

An owned pointer has to be initialized (1) and validated (2) bofore its usage (3) :)

C++

class B
{
public:
  void f();
};

class A
{
  B* m_pcB;

public:
  A() : m_pcB(NULL /*1*/) {}
  //..

  void UseB() { if (m_pcB /*2*/) m_pcB->f(/*3*/); }
  void ResetB() { if (m_pcB /*2*/) { delete m_pcB /*3*/; m_pcB = NULL /*1*/} }
  //..
}

All (owned and not owned) pointers should be validated before their usage.

how to remove crash due to bad pointer?

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