passing temporary storage as a non-const parameter to a function

[jjleto]

Hello,

When I compile the following code:

        #include <iostream>
        #include <string>
        using namespace std;

        void f1(const string& msg) { cout << msg << endl; }
        void f2(string& msg) {      cout << msg << endl; }

        int main()
        {
                f1(string("foo")); // OK
                f2(string("foo")); // NOK.
        }

I've got the following error on the line calling f2():

error: invalid initialization of non-const reference of type 
'std::string&' from a temporary of type 'std::string' (gcc 3.3.4)

I understand that in this case, if I changed the string in the function, 
i could not use it after the function returns; but in some cases, I need 
to use it.

How do I handle this ?

Thanks.