CODEWITHSUNDEEP
c++
thachsinh
thachsinh

Reputation: 11

define class pointer in c++

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

class people
{
public:

   people* p;
   int x;
   people();
};
people::people()
{
   p = NULL;
}
void main()
{

    people jax;
    jax.p->x = 1;

}

i got this error

Unhandled exception at 0x00361419 in classarray.exe: 0xC0000005: Access violation writing location 0x00000004.

in this line jax.p->x = 1;

help me pls !

Upvotes: 1

Views: 171

Answers (2)

Yappie
Yappie

Reputation: 399

Other way is to implement special function for inner pointer initialization:

void people::init_p()
{
   if(!p) p = new people();
}

Upvotes: 1

tune2fs
tune2fs

Reputation: 7705

you need to reserve memory for people:

void main()
{

    people jax;
    jax.p=new people;
    jax.p->x = 1;
    ...

    delete jax.p;

}

EDIT: in the end you need to free your memory, or your will have a memory leak.

Upvotes: 2

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