What is a possible way to store data from a stringstream into an unsigned long?

Question

I am trying to make a program which puts the contents stored in a stringstream (a large number) into an unsigned long format. But the compiler shows an error

error: invalid user-defined conversion from 'std::stringstream {aka std::basic_stringstream}' to 'long unsigned int' [-fpermissive]|

The code I've written is:

stringstream raw_a;
stringstream raw_b;

//code which reads data into raw_a and raw_b

unsigned long out_a;
unsigned long out_b;

out_a = raw_a;
out_b = raw_b;

I have spent the last hour scouring the web in vain. Any help (including links to any other questions) is highly appreciated.

That's not how you use stringstreams... Did you look at the documentation at all? — Borgleader, Mar 11 '15 at 15:16
@Borgleader: Im completely open to any help. Even a link to a page I should read. — Vaibhav, Mar 11 '15 at 15:18
An hour is not enough and the web is not enough. Spend a few days studying proper research material. — Lightness Races in Orbit, Mar 11 '15 at 15:32

score 4 · Accepted Answer · answered Mar 11 '15 at 15:17

4

To extract formatted data from a stringstream, do what you'd do with any other stream:

raw_a >> out_a;

answered Mar 11 '15 at 15:17

Mike Seymour

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@Vaibhav: Why do you feel the need to use that word? – Lightness Races in Orbit Mar 11 '15 at 15:32
@LightnessRacesinOrbit: Because, in retrospect this was a stupid question. I should have searched for the correct syntax on receiving that error. Unfortunately Stack is the only way I can clarify doubts, as I'm teaching myself. – Vaibhav Mar 11 '15 at 16:09

What is a possible way to store data from a stringstream into an unsigned long?

1 Answers1