C++中将数字转换为字符串

#include<iostream>
#include<string>
#include<sstream>
using namespace std;
template<typename T>
void to_string(T value) {
  std::ostringstream os;
  os << value;
  return os.str;
}
int main() {
  int lcc1 = 1;
  long lcc2 = 122;
  double lcc3 = 2.1;
  string s1 = to_string(lcc1);
  string s2 = to_string(lcc2);
  string s3 = to_string(lcc3);
  cout << s1 << "\n" << s2 << "\n" << s3 << endl;
}