网站提供什么服务,上海陆海建设集团网站,义乌建网站,网页托管服务是什么C中的异常栈展开是指#xff0c;当某个函数中有异常产生#xff08;这里不考虑是主动抛出的还是被动产生的#xff09;#xff0c;在异常被捕获之前的函数调用链上#xff0c;函数不会正常执行返回#xff0c;即异常产生之后的程序逻辑不会被执行。 #xff08;注意中的异常栈展开是指当某个函数中有异常产生这里不考虑是主动抛出的还是被动产生的在异常被捕获之前的函数调用链上函数不会正常执行返回即异常产生之后的程序逻辑不会被执行。 注意这里不从操作系统层面来讨论函数调用栈等相关观念
看下面一个示例C 中的异常和堆栈展开
#include string
#include iostream
using namespace std;class MyException{};
class Dummy
{public:Dummy(string s) : MyName(s) { PrintMsg(Created Dummy:); }Dummy(const Dummy other) : MyName(other.MyName){ PrintMsg(Copy created Dummy:); }~Dummy(){ PrintMsg(Destroyed Dummy:); }void PrintMsg(string s) { cout s MyName endl; }string MyName;int level;
};void C(Dummy d, int i)
{cout Entering FunctionC endl;d.MyName C;throw MyException();cout Exiting FunctionC endl;
}void B(Dummy d, int i)
{cout Entering FunctionB endl;d.MyName B;C(d, i 1);cout Exiting FunctionB endl;
}void A(Dummy d, int i)
{cout Entering FunctionA endl;d.MyName A ;B(d, i 1);cout Exiting FunctionA endl;
}int main()
{cout Entering main endl;try{Dummy d( M);A(d,1);}catch (MyException e){cout Caught an exception of type: typeid(e).name() endl;}cout Exiting main. endl;
}/* Output:Entering mainCreated Dummy: MCopy created Dummy: MEntering FunctionACopy created Dummy: AEntering FunctionBCopy created Dummy: BEntering FunctionCDestroyed Dummy: CDestroyed Dummy: BDestroyed Dummy: ADestroyed Dummy: MCaught an exception of type: class MyExceptionExiting main.
*/把函数之间的调用关系用图表示如下所示
