C++

Forum

 
Operator "+" unusual overload

Razzex (2)
Hey. Im working on a program and i could use a help overloading operator "+".
I want it to merge 2 files together, something like this :

 
 
 FILE3=FILE1+FILE2;


I tried it like this but I am getting bunch of errors :

1
2
3
4
5
6
7
8
9
10
 
    template<typename T>istream& operator+ <T>(istream &in,istream&in2)
    {
    ofstream merged(in+"_MERGE.ini");
    
    merged<<in.rdbuf()<<endl<<in2.rdbuf();
    
    return merged;
    
    
    }


And the implementation is then :
1
2
3
4
5
6
7
8
9
 
    string FILE1NAME,FILE2NAME,FILE3NAME;
    FILE1NAME="First";
    FILE2NAME="Second";
    FILE3NAME="TEST";
    ifstream file2(FILE1NAME+".ini");
    ifstream file3(FILE2NAME+".ini");
    ofstream fileTest(FILE3NAME+".ini");
    
    fileTest=file2+file3;


Thanks for any help.

Last edited on
keskiverto (10402)
Your attempt claims to return istream&, but actually returns an ofstream automatic variable. Wrong type and a value that will cease to exist.

I would not write such overload. You seem to desire concatenation. Therefore:
ifstream in1;
ifstream in2;
ofstream out1;
copy all from in1 to out1
copy all from in2 to out1
Razzex (2)
Thank you very much for your answer. I am trying to do what you just wrote, but I'm trying to do it using the overloaded operator "+". Do you think that would be possible ?
Topic archived. No new replies allowed.