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法律研究C++中的異常處理和物件銷燬
C++ 中的解構函式一般在物件銷燬並從系統中釋放記憶體時呼叫。在類的異常中丟擲異常時，解構函式將在捕獲塊執行前自動呼叫。
演算法
Begin Declare a class sample1. Declare a constructor of sample1. Print “Construct an Object of sample1” Declare a destructor of sample1. Print “Destruct an Object of sample1” Declare a class sample. Declare a constructor of sample2. Declare variable i of the integer datatype. Initialize i = 7. Print “Construct an Object of sample1”. Throw i. Declare a destructor of sample2. Print “Destruct an Object of sample2” Try: Declare an object s1 of class sample1. Declare an object s2 of class sample2. Ctach(int i) Print “Caught”. Print the value of variable i. End.
示例程式碼
#include <iostream>
using namespace std;
class Sample1 {
public:
Sample1() {
cout << "Construct an Object of sample1" << endl;
}
~Sample1() {
cout << "Destruct an Object of sample1" << endl;
}
};
class Sample2 {
public:
Sample2() {
int i =7;
cout << "Construct an Object of sample2" << endl;
throw i;
}
~Sample2() {
cout << "Destruct an Object of sample2" << endl;
}
};
int main() {
try {
Sample1 s1;
Sample2 s2;
} catch(int i) {
cout << "Caught " << i << endl;
}
}輸出
Construct an Object of sample1 Construct an Object of sample2 Destruct an Object of sample1 Caught 7
更新於: 2019-7-30
694 次瀏覽
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