Error: Invalid Allocation Size

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VS2010

C++

class Stack
{
    int *ptrStack;
    int top;
    int size;

public:
    Stack(int = 10);                    // Default Constructor
};

Stack::Stack(int s): size(s > 0 ? s ? : 10), top(-1), ptrStack (new int[size])
{
     // Body
}

main()
{
     Stack<integer> intStack(7);
}

As I Run the above sample, I get the Debug Error: Invalid Allocation Size. By debugging the sample, I came to know that "size" is not initializes and take some garbage value.
please correct the mistake, I made.

Thanks
Abid

Posted 19-Apr-11 22:58pm

Aabid

Updated 19-Apr-11 23:15pm

Sandeep Mewara

v2

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Sandeep Mewara 20-Apr-11 4:59am

Looks incomplete code and question.

Can you please edit and update it. Be a little elaborate on the issue and code used.

Aabid 20-Apr-11 5:09am

[Removed the code from here]

Sandeep Mewara 20-Apr-11 5:15am

Updated it for you.

Olivier Levrey 20-Apr-11 5:01am

Please update your question and your code. We can't help with that.

Aabid 20-Apr-11 5:07am

[Removed code from here]

Prerak Patel 20-Apr-11 5:19am

I am just wondering what is size(s > 0 ? s ? : 10)?

2 solutions

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markkuk · Accepted Answer · 2011-04-20T00:06:00

The member variables are initialized in the order they are defined in the class definition, not in the order they appear in the constructor's initialization list. http://codewrangler.home.comcast.net/~codewrangler/tech_info/ctor_init.html#InitializationOrder[^]
http://www.goingware.com/tips/parameters/membervars.html[^]
This causes ptrStack to be initialized first, while size is still undefined. Rearrange your class definition to:

class Stack
{
    int size;
    int top;
    int *ptrStack;
public:
    Stack(int = 10);                    // Default Constructor
};

CPallini · Accepted Answer · 2011-04-19T23:24:00

Solution 2

Aabid wrote:
size(s > 0 ? s ? : 10)

The above should be:

C++

size(s > 0 ? s : 10)

Posted 19-Apr-11 23:24pm

CPallini

Comments

Olivier Levrey 20-Apr-11 5:34am

My 5.

Sergey Alexandrovich Kryukov 20-Apr-11 17:49pm

My 5 too,
--SA