try_throw.org

Refs

1. http://www.on-time.com/ddj0011.htm
2. http://www.catb.org/jargon/html/D/Duffs-device.html
3. http://www.di.unipi.it/~nids/docs/longjump_try_trow_catch.html
4. https://zh.wikipedia.org/wiki/Setjmp.h
5. http://web.eecs.utk.edu/~huangj/cs360/360/notes/Setjmp/lecture.html

问题

1. 子函数的throw问题无法解决
2. 多层抛出问题?
3. 返回值无法规范的问题.
4. 无法处理继承关系

Src

  int
main(int argc, char** argv)
{
    do {
        jmp_buf ex_buf__;
        switch(_setjmp(ex_buf__)) {
        case 0:
            while(1) {
                {
                    printf("In Try Statement\n");
                    longjmp(ex_buf__, (2));
                    printf("I do not appear\n");
                }
                break;
            case (1):
                {printf("Got Foo!\n");}
                break;
            case (2):
                {printf("Got Bar!\n");}
                break;
            case (3):
                {printf("Got Baz!\n");}
                break;
            }
        default:
            {{printf("...et in arcadia Ego\n");}break;}
        }
    }while(0);
    return 0;
}

  #include <stdio.h>
#include <setjmp.h>

int main(int argc, char *argv[])
{
    {
        jmp_buf env;
        switch(setjmp(env)){
        case 0:
            {   
                // Normal
                int i = 0;
                printf("throw now\n");
                longjmp(env, 2);
            }
            break;
        case 1:
            // Handler
            break;
        case 2:
            // Handler
            printf("Got 2!\n");
            break;
        }
        printf("%d\n", i);
        printf("Finally!\n");
    }
    return 0;
}

#include "try_throw.h"

#define FOO_EXCEPTION (1)
#define BAR_EXCEPTION (2)
#define BAZ_EXCEPTION (3)


int
main(int argc, char** argv)
{
    TRY{
        int i = 0;
        printf("In Try Statement\n");
        THROW( BAR_EXCEPTION );
        printf("I do not appear\n");
    }CATCH( FOO_EXCEPTION ){
        printf("Got Foo!\n");
    }CATCH( BAR_EXCEPTION ){
        printf("Got Bar!\n");
    }CATCH( BAZ_EXCEPTION ){
        printf("Got Baz!\n");
    }FINALLY{
        printf("%d\n", i);
        printf("...et in arcadia Ego\n");
    }ETRY;
    return 0;
}