Passing Struct To Function

[teand2]

Can you guys help me straighten my code out?

How do I set up the function call and prototype to pass these structs to the function? Below is what I have but it is pretty much all wrong.

First Struct:

struct gamePiece {
  char horzL;
  int vertL;
} gamePieceLocation;

Second Struct:

struct gamePieceMI {
  string direction;
  int numOfSpaces;
  int invalidMoves;
} moveInfo;

Function Prototype:
struct gamePieceMover(gamePiece location, gamePieceMI moves);

Function Call:

while ( !( intData.eof() ) )
	{
		intData >> moveInfo.direction >> moveInfo.numOfSpaces;
		cout << moveInfo.direction << "  " << moveInfo.numOfSpaces << endl;
		cout << gamePieceMover (gamePieceLocation, moveInfo) << endl << endl;
	}

[teand2]

Do you need the actual function too?

[Aceix]

a function with return type, the keyword struct? that's inappropriate. do you want to display/return a member of one of the structs? and which one?

Aceix.

[Catfish4]

Think of a struct as a custom data type.
How do you write a function returning a data type int?

int functionName();

How do you write a function returning a data type gamePiece?

gamePiece functionName();

In good old C (not C++), it's customary to put struct and enum in front of the data type, when not using a typedef.

struct GamePiece {
    // ...
};

struct GamePiece functionName(struct GamePiece input)
{
    return input;
}

This is not the case anymore, in C++.
Reading your post again, you ask about how to pass a custom struct to a function. The way you do it currently is correct, it's just that the return type doesn't make sense.

void gamePieceMover(gamePiece location, gamePieceMI moves);

[Aceix]

Catfish4 wrote:

void gamePieceMover(gamePiece location, gamePieceMI moves);

since OP is cout-ing the return value of the function, it can't be returning a void.

Aceix.

[teand2]

Ahh, I think I get it CatFish. So, the value that is returned to the function call is used as the data type for the struct?

For the actual function, I need to bring in the values in gamePiece and the values in gamePieceMI. Then, the function has a bunch of loops that will change the two values in gamePiece. Last, the function needs to return the updated gamePiece value.

So it would be

gamePiece gamePieceMover(gamePiece location, gamePieceMI moves)
{
    return location;
}

?

[Catfish4]

@ teand2: yes, looks good to me.

[teand2]

Thanks both of you. It works fine now.