在指向對象的指針上調用delete []時發生BLOCK_TYPE_VALID錯誤

此代碼在delete [] placard_上返回錯誤;調用在指向對象的指針上調用delete []時發生BLOCK_TYPE_VALID錯誤

void Protestor::destroy() { //Free's caller Protestor's dynamic memory 
    delete [] placard_; 
}

此代碼不會。

void Protestor::destroy() { //Free's caller Protestor's dynamic memory 
    delete placard_; 
}

這違背了我的課堂筆記，其狀態隨時撥打

delete []

而不是

delete

，這是什麼行爲，如何解釋呢？在什麼情況下必須'刪除'而不是'delete []'？

這裏是抗議者和標誌類的定義。

class Protester 
{ 
    public: 
    Protester(string name, string signSlogan, int signHeight, int signWidth, 
       int rcmp_file = 0); 
    string getName() const; 
    Sign getPlacard() const; 
    void changePlacard(string newSlogan, int newHeight, int newWidth); 
    void setRCMPfile(int RCMP_file); 
    int getRCMPfile() const; 

    //Big Three 
    Protester(const Protester& other); //Copy Constructor 
    ~Protester(); //Destructor 
    Protester& operator= (const Protester& other); //Assignment Constructor 


private: 
    // name of the Protester 
    string name_; 

    // a sign the protester is wielding 
    Sign* placard_; 

    // the RCMP file number tracking this person (zero means no RCMP report) 
    int rcmp_file_; 

    //Big Three Helper Functions 
    void copy(const Protester& other); //Performs Deep Copy of const Protester& 
    void destroy(); //deletes [] placard_ 
        //sounds better then cleanup, in my humblest of opinions. 
}; 

class Sign 
// a class representing information about signs/placards 
{ 
public: 
    // constructor to initialize sign text and dimensions 
    Sign(string statement, int height, int width); 

    // return sign text 
    string getStatement() const; 

    //return sign height 
    int getHeight() const; 

    //return sign width 
    int getWidth() const; 

    // change sign text 
    void setStatement(string statement); 

    // change sign dimensions 
    void setSize(int height, int width); 

private: 
    // the text of the sign 
    string statement_; 

    // dimensions of the sign 
    int height_; 
    int width_; 
};

來源

2012-03-02 Sam Coulter