string to int conversion

[graciano]

Hi!

I used atoi from stdlib to manage this conversion ... something like this.

#include <string>
#include <cstdlib>
...
	int x[5];
	string s;
        ...
	x[i] = atoi(s.c_str());
	...

Is there a method from string class to do this ... could not find one?
Thanks

[helios]

std::stringstream stream;
std::string str="12";
stream <<str;
int n;
if (!(stream >>n)){
    //could not convert
}

[graciano]

f3.cpp:5: error: aggregate ‘std::stringstream stream’ has incomplete type and cannot be defined

Why do i get this error?

#include <iostream>
#include <string>
using namespace std;
int main(){
	std::stringstream stream;
	std::string str="12";
	stream <<str;
	int n;
	if (!(stream >>n)){
		//could not convert
	}
}

[Duthomhas]

#include <sstream>

[graciano]

Thanks

[jsmith]

also

#include <boost/lexical_cast.hpp>

int n = boost::lexical_cast<int>( str );

does essentially the same thing, but in one line of code instead of three.