流类库8

#include<iostream>
#include<sstream>
#include<string>
using namespace std;
template<class T>
inline T fromString(const string &str){
istringstream is(str);
T v;
is>>v;
return v;
}
int main()
{
int v1=fromString<int>("5");
cout<<v1<<endl;
double v2=fromString<double>("1.2");
cout<<v2<<endl;
return 0;
}