一個函數(shù)里兩個setjmp

We can call this function as an advance version of goto statement but with more dynamic range. The longjump() function allows us to pass parameters to know that the control has been jumped or not.

我們可以將此函數(shù)稱為goto語句的高級版本，但具有更大的動態(tài)范圍。 longjump()函數(shù)使我們可以傳遞參數(shù)來知道控件是否已跳轉。

So how to use this is the question. First thing is to decide point from where you want to jump and then decide to where you want to jump.

因此，如何使用此問題。 第一件事是確定要從哪里跳轉的點，然后再確定要跳轉的位置。

Before setting these point just make a jum_buf object. Now rest is a cake walk. In this example, I have put the point from where we want to jump inside a function called func by calling the function longjmp(a, 1) with two parameters as the jum_buf object and 1 will be return at the setjump call.

在設置這些點之前，只需創(chuàng)建一個jum_buf對象。 現(xiàn)在休息是輕輕松松。 在此示例中，我通過調用帶有兩個參數(shù)的longjmp(a，1)函數(shù)作為jum_buf對象，將要從其中跳轉到函數(shù)func的位置，在setjump調用中將返回1。

Call the function setjmp() at the point to where you want to jump. The Second parameter from the longjump will be stored in z. This z can be then checked for loops or maybe something else.

在要跳轉的位置調用函數(shù)setjmp() 。 longjump中的第二個參數(shù)將存儲在z中 。 然后可以檢查此z的循環(huán)或其他內容。

setjmp.h- longjmp()函數(shù)在C中的示例 (setjmp.h- longjmp() function Example in C)

</ s> </ s> </ s> #include <stdio.h> #include <setjmp.h>//defining the type of the variable static jmp_buf a;void func(void) {//message for userprintf("Function starts here..\n");//calling functionlongjmp(a, 1);//message for userprintf("Function ends here..\n"); }int main() {int z;//message for userprintf("Main starts here..\n");//setting current value in zz = setjmp(a);//condition to display messageif (z != 0){//message for userprintf("longjmp function called\n");return 0;}func();//message for userprintf("Main ends here..\n");return 0; }

Output

輸出量

翻譯自: https://www.includehelp.com/c-programs/longjmp-function-of-setjmp-h-in-c.aspx

一個函數(shù)里兩個setjmp

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