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segmentation fault

 
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segmentation fault, segmentation fault
srishekh
10 Dec, 2006 - 11:02 PM
Post #1

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Hello every body,

I have a structure having string object, and I have created
structure variable p, and initialized values.
Now before filling new values i want to clear it off using memset, but it gives me seg fault error.
Any solutions for me.

thanks in advance

code:
CODE

#include <stdio.h>
#include <iostream>
#include <string>
using namespace std;

typedef enum
{
   UNKNOWN_AVP = -1,
   FIXED_AVP = 0,
   REQUIRED_AVP = 1,
   OPTIONAL_AVP = 2
}DICT_BASED_AVP_TYPES;


struct ABC
{
int a;
string  s1;
DICT_BASED_AVP_TYPES val;

};


int main()
{

struct ABC p,q;
p.a= 100;
p.s1=string("gfdhgf");
p.val=(DICT_BASED_AVP_TYPES)1;
memset(&p,0,sizeof(struct ABC));
cout<<"end"<<endl;
}
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horace
RE: Segmentation Fault
11 Dec, 2006 - 12:46 AM
Post #2

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you structure contains string object p, i.e.
CODE

p.s1=string("gfdhgf");

you overwrite p with 0's
CODE

memset(&p,0,sizeof(struct ABC));


at the end of the compound statement an attempt will be made to call the destructor for the string object p.s1 and you get a segmentation error.
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srishekh
RE: Segmentation Fault
11 Dec, 2006 - 01:09 AM
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Actualy that statement is required in a loop.
So, before filling new values i need to clear the previous values.
How do I do that ?
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horace
RE: Segmentation Fault
11 Dec, 2006 - 10:59 PM
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not sure what you mean by "before filling new values i need to clear the previous values". When you assign new values the previous ones are overwritten.
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srishekh
RE: Segmentation Fault
13 Dec, 2006 - 07:54 PM
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ya , it will be overwritten.
But I want to make sure that it is cleared completely
before filling new values.
Any ways ?
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