Safely convert string to template parameter type T

from_string.hpp

#include <string>
#include <sstream>

// Convert string to type T
template <class T> bool from_string(T& t, const std::string& s, std::ios_base& (*f)(std::ios_base&)) {
  std::istringstream iss(s);
	return !(iss >> f >> t).fail();
}