cpp的异常

cpp的异常

我们得区分异常，bug，逻辑错误

什么是异常？

提供一种安全方法，用于程序可以预见，但不常见的情况

如何使用他们？带来的问题？

try{}catch(...){}

手工引发异常

throw “exception”；

创建异常类

////  main.cpp//  use_exception////  Created by bikang on 16/11/1.//  Copyright (c) 2016年 bikang. All rights reserved.//#include <exception>#include <iostream>using namespace std;class MyException:public exception{public:    MyException(const char*what):m_what(what){    }    virtual const char *what() const throw()    {        return m_what;    }private:    const char *m_what;};void testException(){    try    {        throw MyException("my exception");    }    catch (MyException &e){        std::cout << e.what() << std::endl;    }}void texception();int main(int argc, const char * argv[]) {    texception();    return 0;}void texception(){    cout << "test exception" << endl;    try {        throw " throw excepiton";    } catch (const char *ex) {        cout << "\n"<< ex << endl;    }    cout << "done" <<endl;    //自定义异常    testException();}