标准C库中的非局部跳转函数

setjmp()和longjmp().使用setjmp()可以在程序中保存一个已知的无错误状态，一旦发生错误，就可以通过longjmp()返回到该状态。

示例:

#include <iostream>
#include <csetjmp>


using namespace std;

class Rainbow {
    public:
        Rainbow() {cout << "Rainbow()" << endl;}
        ~Rainbow() {cout << "~Rainbow()" << endl;}
};

jmp_buf kansas;

void oz() {
    Rainbow rb;
    for(int i = 0; i < 3; i++) {
        cout << "there's no place like home" << endl;
    }
    longjmp(kansas,47);
}

int main()
{
    if (setjmp(kansas) == 0) {
        cout << "tornado, witch, muchkins..." << endl;
        oz();

    }
    else {
        cout << "Autie Em!"
             << " I had the strangest dream..."
             << endl;
    }
    return 0;
}


运行结果:

tornado, witch, muchkins...

Rainbow()

there's no place like home

there's no place like home

there's no place like home

Autie Em! I had the strangest dream...

Process returned 0 (0x0)   execution time : 0.094 s

Press any key to continue.

运行环境: codeblock 10 + gcc + winXP