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Home/ Questions/Solving the error: c++ incomplete type is not allowed
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Nathan Carre
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Nathan Carre
Asked: May 12, 20222022-05-12T09:35:08+00:00 2022-05-12T09:35:08+00:00In: cpp

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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    dhtutoria Expert
    2022-06-01T16:58:09+00:00Added an answer on June 1, 2022 at 4:58 pm

    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() 
    { 
    }
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  2. Maël Boucher
    2022-05-25T19:39:00+00:00Added an answer on May 25, 2022 at 7:39 pm

    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.
    }
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