C++ 利用流来进行string和其他类的转换

#include<string>
#include<sstream>

string Othertostring(double a)
{
ostringstream oss;
oss << a;
return oss.str();
}
string Othertostring(int a)
{
ostringstream oss;
oss << a;
return oss.str();
}
double StringToDouble(string str)
{
istringstream iss(str);
double a;
iss >> a;
return a;
}