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Nathan Carre
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Asked: 2022-05-12T09:35:08+00:00 In:

Solving the error: c++ incomplete type is not allowed

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How to check – c++ incomplete type is not allowed? I have the sample detail:

class Player;
 
 class Ball {
 public:
  Player& PlayerB;
  float ballPosX = 800;
 private:
 
 };
class Ball;
 
 class Player {
 public:
  void doSomething(Ball& ball);
 private:
 };

While I run it, I found the warning message:

Incomplete type not allowed

That is my question in my midterm exam, and it is urgent. I searched some methods on some websites, but I didn’t get it. I may miss any line or other changes. I appreciate your assistance!

incomplete type is not allowed
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2 Answers

  1. Best Answer
    Expert

    The cause:

    The issue happens when compiler finds identifier which is one of the recognized data type nevertheless its definition is not clear at all.

    Solution: Put your definitions as the following direction in order to compile the code:

    Modified code:

    class Ball;
 class Player { 
public: 
void doSomething(Ball& ball); 
private: 
}; 

class Ball { public: 
Player& PlayerB; 
float ballPosX = 800; 
private: 

}; void Player::doSomething(Ball& ball) {
 ball.ballPosX += 10; // incomplete type error occurs here. 
} 
int main() 
{ 
}
    • 15

  2. Player.cpp requires the definition of Ball class. Simply add #include "Ball.h"


    Player.cpp:

    #include "Player.h"
#include "Ball.h"

void Player::doSomething(Ball& ball) {
 ball.ballPosX += 10; // incomplete type error occurs here.
}
    • 15

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