Re: overloading for multiple arithmetic operations

mingze zhang <>
Tue, 13 Jul 2010 20:50:30 CST
On Jul 14, 6:43 am, Dominic Chandar <> wrote:


    I would like to add multiple objects of a class with integers/
floats. Need some basic help in fixing an error


using namespace std;
 class Test
     Test(float _code){ code = _code;}
     float code;
     friend Test operator+(Test & ob, float val);
     friend Test operator+(float val, Test & ob);
     Test operator+(Test & ob);
Test Test::operator+(Test & ob)
  Test temp;
  temp.code = this->code + ob.code;
  return temp;}

Test operator+(Test & ob, float val)
   Test temp;
   temp.code = ob.code + val;
   return temp;
Test operator+(float val, Test & ob)
   Test temp;
   temp.code = ob.code + val;
   return temp;}

int main()
  Test ob1(1.0), ob2(2.0), ob3(3.0), ob4(0.0);
  float c1=100.5 ;

   ob4 = ob1+ob2+ob3 ; // This works
   ob4 = ob1+c1; // This works
   ob4 = ob1 + ob2 + c1 ;// Does not work... why ?
   ob4 = ob1 + c1 + ob2 ;// This works...

  return 0;


My question is : why does the third operation ob4 = ob1 + ob2 + c1
fail ?


Test operator+(Test & ob, float val);
Test operator+(const Test & ob, float val);

A temp variable (ob1+ob2) cannot be passed to non-const reference.

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