Thread: TICPP and const issues

I'm getting this error:

Game.cpp:416: error: passing ‘const Coach’ as ‘this’ argument of ‘const std::string Person::getName()’ discards qualifiers

Code:

ticpp::Element Game::toXML() const {

  Team* home=homeTeam;
  Team* away=awayTeam;

  ticpp::Element game=("Game");
  game.SetAttribute("location",location);

  //Home Team Elements
  ticpp::Element homeTeamElement("HomeTeam");
  ticpp::Element homeCoach=("Coach");
  

  //Coach Elements
  //Coach Attributes

  //ERROR IS HERE
  homeCoach.SetAttribute("name", (home->getCoach())->getName());

  homeTeamElement.InsertEndChild(homeCoach);

home is a pointer, getCoach() returns a const Coach* const, and getName() returns a const string.

If I remove all the consts, it works fine, but I need the consts.

Any help would be great.

Can you declare getName as a const function? (The name suggests you can.)

Code:

 const string Person::getName(){
	const holder=name;
	return holder;
}

Code:

const string Person::getName() const{
	const holder=name;
	return holder;
}

This works. I thought the const after the function dealt with the pointer, not the function itself.

Originally Posted by TIMBERings

Code:

const string Person::getName() const{
	const holder=name;
	return holder;
}

This works. I thought the const after the function dealt with the pointer, not the function itself.

You don't really have a pointer (unless you mean the this pointer?) here at all, so I have no idea where you were headed. (And if you do mean the this pointer, then you are right in practice at least -- putting a const there means the this pointer can be a const pointer.)

I know there's not a pointer in this one. That's why I hadn't put const at the end of the declaration, because I thought it only applied to pointers.

While we're at it, along the same lines:

Team.cpp:47: error: passing ‘const std::map<int, Player, std::less<int>, std::allocator<std::pair<const int, Player> > >’ as ‘this’ argument of ‘_Tp& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const _Key&) [with _Key = int, _Tp = Player, _Compare = std::less<int>, _Alloc = std::allocator<std::pair<const int, Player> >]’ discards qualifiers

Code:

map<int, Player> players;

const Player* Team::getPlayer(int number) const{
  
  map<int,Player>::const_iterator it;
  it=players.find(number);
  if (it!=players.end()){

    //ERROR HERE
    const Player* const playerPtr=&players[number];
    
    return playerPtr;
  }
  else {
    return NULL;
  }
}

I can't declare player as a const because I need to add to it later.

I take it players is a member of Team? If so, then you can't use [], since that's not a const function/operator (since you use [] to add to a map). On the other hand, I don't know that you need to go to all that trouble, since it points to the element you want; why not

Code:

return &(*it);

?

I finished with this, and it compiled. Now I just hope it gets me what I want;

Code:

const Player* Team::getPlayer(int number) const{
  map<int,Player>::const_iterator it;
  it=players.find(number);
  if (it!=players.end()){
    const Player* const playerPtr=&((*it).second);
    return playerPtr;
  }
  else {
    return NULL;
  }
}

Thank you.