带析构语义的类的C++异常处理

C++异常处理

#include <iostream>
#include <string>
using namespace std;

class MyException {
public:
    MyException(const string &message):message(message){}
    ~MyException(){}
    const string &getMessage() const { return message; }
private:
    string message;
};

class Demo {
public:
    Demo(){ cout << "Constructor of Demo" << endl; }
    ~Demo(){ cout <<"Destructor of Demo" << endl; }
};

void func() throw (MyException) {
    Demo d;   //执行构造函数
    cout << "Throw MyException in func()" << endl;
    throw MyException("exception thrown by func()");
}

int main(){
    cout << "In main function" << endl;
    try {
        func();
    }catch(MyException& e){
        cout << "Caught an exception:" << e.getMessage()<< endl;
    }
    cout << "Resume the execution of main()" << endl;
    return 0;
}

结果

In main function
Constructor of Demo
Throw MyException in func()
Destructor of Demo
Caught an exception:exception thrown by func()
Resume the execution of main()