I tried following code :

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

string f1(string s)
{
   return s="f1 called";
}

void f2(string *s)
{
   cout<<*s<<endl;
}

int main()
{
   string str;
   f2(&f1(str));
}

But this code doesn't compile.
What I think is : f1 returns by value so it creates temporary, of which I am taking address and passing to f2.
Now Please explain me where I am thinking wrong?