How to override != and == operators in c++ for struct?

Question

C++ / C#

When iterating over a list of students, the compiler asks you to redefine the !=.
Here is the code snippet where I am trying to do it:

static student operator == (request c1, request c2)
  { 
    
    if (c1.Name == c2.Name)
      return;
      if(c1.MiddleName==c2.MiddleName)
      return;
    if(c1.Surname==c2.Surname)
      return;
        if(c1.language==c2.language)
      return;
    if(c1.languagelevel==c2.languagelevel)
      return;
    
  }
  static request operator != (request c1, request c2)
  {
     if (!(c1.Name == c2.Name))
       return ;
     if (!(c1.MiddleName == c2.MiddleName))
       return;

     if (!(c1.Surname == c2.Surname))
       return;

     if (!(c1.language == c2.language))
       return;

     if (!(c1.languagelevel == c2.languagelevel))
       return;
  }

Next, I'll show you what the fields look like:

wchar_t Name[80];
  wchar_t MiddleName[80];
  wchar_t Surname[80];
  wchar_t language[80];
  wchar_t languagelevel[80];
  Intensivity intensivity;

And this is how I iterate it:

for (list< request>::iterator it = requests->begin() ; it!=requests->back();it++ )

How to redefine operators so that iteration works correctly?

Answer 1

Operators must return bool and accept constant references to structures.
But in general, since you're iterating over a list, you're comparing iterators, not structs. Therefore, it is enough to simply use the standard construction:

for (auto it = requests->begin(); it != requests->end(); ++it)

And you don't need to redefine anything. You mixed up end and back. The first returns an iterator and the second returns an element.