How to store an address of a variable in a string?

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I want to convert the int* pointer to a string type.

C++

<pre>#include <iostream>
#include <string>

int main(){
  int a=7;
  const int *ptr=&a;
  std::string address_a=static_cast<const int*>(ptr);
  std::cout<<address_a<<std::endl;
}

What I have tried:

I tried also stringstream aproach but I didn't reach a result

Posted 21-Sep-19 18:25pm

Member 13277493

Updated 22-Sep-19 4:04am

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Rick York 22-Sep-19 11:39am

Are you certain this is what you really want to do? I ask because an address of data in one process has no validity in any other process. In addition, if you were to put data in shared memory, two different processes would be unlikely to get the same address for the same data.

So, let's assume you have the address of your data in a string. What are you going to do with it next?

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Richard MacCutchan · Accepted Answer · 2019-09-21T21:29:00

Solution 1

You cannot cast a number to a string. You need to use a print method to get it converted. You can do it with cout or by using a stringstream type.

C++

std::cout << ptr << endl;

Posted 21-Sep-19 21:29pm

Richard MacCutchan

Comments

Member 13277493 22-Sep-19 3:43am

I need that conversion for creating my hash function, but if it is not possible, then I will think another hashing function, thanks!

Richard MacCutchan 22-Sep-19 3:51am

My answer explains how you can convert it. What part do you not understand?

Member 13277493 22-Sep-19 3:56am

Sorry, I misunderstood the answer. I will try and see if there will be any problems.

Richard MacCutchan 22-Sep-19 4:32am

It would help us to help you if you explained what you are trying to do.

Member 13277493 22-Sep-19 11:53am

I just wanted to build a hash function for linked list nodes, which would take as an input their addresses and gave me hashTable index

Richard MacCutchan 23-Sep-19 1:28am

Since all addresses will be unique you have no need to hash them. In fact hashing could, in theory, produce duplicate values.

Member 13277493 23-Sep-19 23:48pm

I want tp use it for detecting a loop in a linked list

Richard MacCutchan 24-Sep-19 2:53am

Then, as I said, just use the addresses of the nodes, as they will all be unique.

CPallini · Accepted Answer · 2019-09-22T04:04:00

Solution 2

What's wrong with the stringstrem approach?
Try:

C++"

#include <iostream>
#include <sstream>
#include <string>

int main(){
  int a=7;
  const int *ptr=&a;

  std::ostringstream oss;
  oss  << ptr;
  std::string address_a = oss.str();
  std::cout<<address_a<<std::endl;
}

Posted 22-Sep-19 4:04am

CPallini

Comments

Member 13277493 22-Sep-19 11:52am

thank you! My stringstream approach was different, I didn't know about str() function, I should have studied stringstream well before using it.

CPallini 22-Sep-19 16:53pm

You are welcome.