Vector Problem By Pointers

[donamin]

hi every one.
i have a struct which contains a vector<int>. when i define a pointer of that struct and try to add elements into that vector. i get this exception:

Unhandled exception at 0x624d31ea (msvcr90d.dll) in Test.exe: 0xC0000005: Access violation reading location 0xcdcdcdc1.

does anyone has any idea about this problem?
i know if i don't use pointers, it'll work fine, but i want to solve that by having pointers.

[donamin]

solved! i should've used "new" instead of "malloc" :D

[ledien]

please, show your code .:)

[donamin]

#include<iostream>
#include<vector>
using namespace std;

struct MyStruct
{
	vector<int> arr;
};

int main()
{
	MyStruct *s = new MyStruct;
	//s = (MyStruct *)malloc(sizeof(MyStruct));
	s->arr.push_back(2); //Exception happens here...
	return 0;
}

[ledien]

there aren't any error .
I use VS2010 to compile your code.

#include<iostream>
#include<vector>
using namespace std;


struct MyStruct
{
	vector<int> arr;
};

int main()
{
	MyStruct *s = new MyStruct;
	//s = (MyStruct *)malloc(sizeof(MyStruct));
	s->arr.push_back(2); //Exception happens here...
	cout<<s->arr.at(0);
	return 0;
}

2

[donamin]

of course there's no errors now! i told i solved it.

#include<iostream>
#include<vector>
using namespace std;


struct MyStruct
{
	vector<int> arr;
};

int main()
{
	MyStruct *s;
	s = (MyStruct *)malloc(sizeof(MyStruct));
	s->arr.push_back(2); //Exception happens here now...
	return 0;
}

i forgot to clear the comment in the latest post :)

[ledien]

Have a nice day :)

[ne555]

i should've used "new" instead of "malloc"

*sigh* neither.

MyStruct s; 
s.arr.push_back(2);