【文章內容簡介】 20 =35 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. =20 =35 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. Ok 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. Ok x y =20 =35 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok x y x=30 =20 =35 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok x y x=30 y=55 =20 =35 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok x y x=30 y=55 =20 =35 =30 =55 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok x y x=30 y=55 =20 =35 =30 =55 由于不能返回 main主函數，所以將 R的值暫時賦給一個匿名對象。 需要調用拷貝初始化構造函數 =30 =55 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok x y x=30 y=55 =20 =35 =30 =55 Copy_initialzation Constrctor called. =30 =55 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 x y x=30 y=55 =20 =35 =30 =55 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok Copy_initialzation Constrctor called. Destructor called. Destructor called. =30 =55 調用兩次，分別釋放對象 R和對象 Q 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 x y x=30 y=55 =20 =35 =30 =55 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok Copy_initialzation Constrctor called. Destructor called. Destructor called. =30 =55 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 x y x=30 y=55 =20 =35 =30 =55 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok Copy_initialzation Constrctor called. Destructor called. Destructor called. =30 =55 .X=30 .Y=55 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 x y x=30 y=55 =20 =35 =30 =55 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok Copy_initialzation Constrctor called. Destructor called. Destructor called. =30 =55 .X=30 .Y=55 調用一次，釋放匿名對象 A 賦值結束，需要釋放匿名對象 A 對象的初始化 例 ：分析程序輸出結果 =20 =35 =0 =0 =20 =35 x y x=30 y=55 =20 =35 =30 =55 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok Copy_initialzation Constrctor called. Destructor called. Destructor called. =30 =55 .X=30 .Y=55 Destructor called. 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok Copy_initialzation Constrctor called. Destructor called. Destructor called. Destructor called. 對象的初始化 例 ：分析程序輸出結果 =20 =35 =20 =35 =20 =35 =30 =55 對象的初始化 例 ：分析程序輸出結果 =20 =35 =20 =35 =20 =35 =30 =55 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok Copy_initialzation Constrctor called. Destructor called. Destructor called. Destructor called. P=30,55 對象的初始化 例 ：分析程序輸出結果 =20 =35 =20 =35 =20 =35 =30 =55 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok Copy_initialzation Constrctor called. Destructor called. Destructor called. Destructor called. P=30,55 調用三次，分別釋放對象 N、對象 P和對象 M 對象的初始化 例 ：分析程序輸出結果 =20 =35 =20 =35 =20 =35 =30 =55 輸出： Copy_initialzation Constrctor called. Copy_initialzation Constrctor called. ok Copy_initialzation Constrctor called. Destructor called. Destructor called. Destructor called. P=30,55 Destructor called. Destructor called. Destructor called. 對象的初始化 拷貝初始化構造函數 ? 拷貝初始化構造函數的功能就是用一個已知的對象來初始化另一個對象； ? 調用拷貝初始化構造函數的三種情況： ? 明確表示由一個對象初始化另一個對象時： 例： TPoint P2(P1)。 ? 當對象作為函數參數傳遞給函數形參時： 例： P=f(N)。 ? 當對象作為函數返回值時： 例： return R。 目錄 ? 類的定義 ? 對象的定義 ? 對象的初始化 ? 成員函數的特性 ? 靜態(tài)成員 ? 友元 ? 類的作用域 ? 局部類和嵌套 類 （自學） ? 對象的生存周期 成員函數的特性