异常处理

最新推荐文章于 2023-12-18 09:15:46 发布

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最新推荐文章于 2023-12-18 09:15:46 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/javaTest/archive/2009/10/25/2589557.html

本文通过一个C++程序示例展示了如何使用异常处理和longjmp进行流程控制。程序创建了一个名为Rainbow的类，并在main函数中通过try-catch块调用oz函数，该函数会抛出异常或使用longjmp返回到main函数。

#include <iostream>
using namespace std;
class Rainbow {
public:
Rainbow() { cout << "Rainbow()" << endl; }
~Rainbow() { cout << "~Rainbow()" << endl; }
};
void oz() {
Rainbow rb;
for(int i = 0; i < 3; i++)
    cout << "there's no place like home" << endl;
throw 47;
}
int main() {
try {
    cout << "tornado, witch, munchkins..." << endl;
    oz();
} catch(int) {
    cout << "Auntie Em! I had the strangest dream..."
         << endl;
}
getchar();
} ///:~

#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, munchkins..." << endl;
    oz();
} else {
    cout << "Auntie Em! "
         << "I had the strangest dream..."
         << endl;
}
} ///:~