Memory leak in Vector

[thangamani.vaiyapuri]

Hi,

The below code snippet shows memory issues in Vector's push_back
method.

#include <iostream.h>
#include <vector>

class Base
{
private:
std::vector<int > baseData;
public:
void addData(int t) { baseData.push_b ack(t);}
int getData(int index) { return baseData[index]; }
};

void main()
{
Base *bObj = new Base();
bObj->addData(1);
cout << bObj->getData(0) << endl;
}

But I tried my main() as
void main()
{
Base bObj;
bObj.addData(1) ;
cout << bObj.getData(0) << endl;
}
Did not shown any memory issue in this case.

Please explain me in understanding this issue.

Note: I have used Purify Plus to identify leaks.

Thanks in advance,
Thangamani

[John Dibling]

th************* *****@gmail.com wrote:

void main()
{
Base *bObj = new Base();
bObj->addData(1);
cout << bObj->getData(0) << endl;
}

No 'delete'? I'd say the leak is yours -- not vector's.

Take care,

John Dibling

[Torsten Mueller]

th************* *****@gmail.com schrieb:

void main()
{
Base *bObj = new Base();
bObj->addData(1);
cout << bObj->getData(0) << endl;
}

But I tried my main() as
void main()
{
Base bObj;
bObj.addData(1) ;
cout << bObj.getData(0) << endl;
}
Did not shown any memory issue in this case.

Please explain me in understanding this issue.

Note: I have used Purify Plus to identify leaks.

You should rather use a book containing the word "delete".

T.M.

[thangamani.vaiyapuri]

Thanks for your suggestions.

I have tried delete as in:
Base *bObj = new Base();
bObj->addData(1);
cout << bObj->getData(0) << endl;
delete bObj;

still it shows memory leak as below.

Base::addData(i nt)
private:
std::vector<int > baseData;
public:
=> void addData(int t) { baseData.push_b ack(t);}
int getData(int index) { return baseData[index]; }
};

Thangamani

[Kevin Handy]

th************* *****@gmail.com wrote:

Hi,

The below code snippet shows memory issues in Vector's push_back
method.

#include <iostream.h>
should be "#include <iostream>"
#include <vector>

class Base
{
private:
std::vector<int > baseData;
public:
void addData(int t) { baseData.push_b ack(t);}
int getData(int index) { return baseData[index]; }
};

void main()
This is not a valid program, and will not compile.
main should return an int.
{
Base *bObj = new Base();
bObj->addData(1);
cout << bObj->getData(0) << endl;
delete bObj;

This is not java. You don't get free garbage collection.
i.e. If you use 'new', you also need to use 'delete'.
Java lets you get away with this, but C++ doesn't.
}

But I tried my main() as
void main()
This is not a valid program, and will not compile.
main should always return an int.
{
Base bObj;
bObj.addData(1) ;
cout << bObj.getData(0) << endl;
}
Did not shown any memory issue in this case.

Please explain me in understanding this issue.

Note: I have used Purify Plus to identify leaks.

Get a decent book on C++, that talks about using 'new' and
'delete'. And not anything written by Micro$oft or Schildt,
who both believe that main should return a 'void'.

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[Larry I Smith]

th************* *****@gmail.com wrote:

Hi,

The below code snippet shows memory issues in Vector's push_back
method.

#include <iostream.h>
// use <iostream> instead of the old/obsolete <iostream.h>.
// using the old iostream.h on some systems can cause
// all kinds of subtle problems when it is mixed with the
// the standard headers/libs
#include <iostream>
#include <vector>

class Base
{
private:
std::vector<int > baseData;
public:
void addData(int t) { baseData.push_b ack(t);}
int getData(int index) { return baseData[index]; }
};

void main()
int main()
{
Base *bObj = new Base();
bObj->addData(1);
cout << bObj->getData(0) << endl;
// replace the line above with this line
std::cout << bObj->getData(0) << std::endl;

delete bObj;
return 0; }

But I tried my main() as
void main()
int main()
{
Base bObj;
bObj.addData(1) ;
cout << bObj.getData(0) << endl;
// replace the line above with this line
std::cout << bObj.getData(0) << std::endl;

return 0; }
Did not shown any memory issue in this case.

Please explain me in understanding this issue.

Note: I have used Purify Plus to identify leaks.

Thanks in advance,
Thangamani

How did you determine there is a memory leak (i.e. what
makes you think vector leaks memory)?

What compiler (vendor and version) and Operating System
(vendor and version) are you using?

Larry

[thangamani.vaiyapuri]

It works fine. Thanks for all your valuable suggestions.