C++: Efficiently adding integers to strings
- by Shinka
I know how to add integers to strings, but I'm not sure I'm doing it in an efficient matters. I have a class where I often have to return a string plus an integer (a different integer each time), in Java I would do something like
public class MyClass {
final static String S = "MYSTRING";
private int id = 0;
public String getString() {
return S + (id++);
}
}
But in C++ I have to do;
class MyClass {
private:
std::string S; // For some reason I can't do const std::string S = "MYSTRING";
int id;
public:
MyClass() {
S = "MYSTRING";
id = 0;
}
std::string getString() {
std::ostringstream oss;
oss << S << id++;
return oss.str();
}
}
An additional constraint: I don't want (in fact, in can't) use Boost or any other librairies, I'll have to work with the standard library.
So the thing is; the code works, but in C++ I have to create a bunch of ostringstream objects, so it seems inefficient. To be fair, perhaps Java do the same and I just don't notice it, I say it's inefficient mostly because I know very little about strings.
Is there a more efficient way to do this ?
