53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
// 异常变量生命周期
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// 如 1: 抛出对象（堆区），捕获对象（堆区），会使用拷贝构造函数，需要手动释放内存
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#include <iostream>
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#include <cstring>
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#include <cstdlib>
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using namespace std;
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class Exception
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{
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private:
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string msg;
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public:
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Exception()
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{
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this->msg = "";
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cout << this << "Exception()" << endl;
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}
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Exception(const string &msg)
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{
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this->msg = msg;
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cout << this << "Exception(const string &)" << endl;
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}
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Exception(const Exception &other)
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{
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this->msg = other.msg;
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cout << this << "Exception(const Exception &)" << endl;
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}
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~Exception() { cout << this << "~Exception()" << endl; }
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public:
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string &getMsg() // const 表示该成员函数不会修改成员变量
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{
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return this->msg;
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}
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};
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int main()
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{
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try
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{
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// 要使用 new 创建对象，否则会在栈区创建对象，导致异常抛出时，会调用析构函数
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throw new Exception("异常"); // 在堆区创建对象
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}
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catch (Exception *e)
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{
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cout << "捕获异常: " << e->getMsg() << endl;
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delete e; // 手动释放内存
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}
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return 0;
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} |