本例外處理系列為【實驗性質】,研究結束中......。
啊啊啊啊,沒辦法把 try
改成不需要返回點的形式,
然後就可以去掉 catch_end
......我想不到啊!!__COUNTER__
不能 reset 啊啊aaaaaa ヽ(#`Д´)ノ
我做不到跨區域的相同巨集定義啊, (╯‵□′)╯︵┴─┴ (崩潰
finally()
和 clear_throw()
巨集函數。error_code
代替的 isItError
。error_place
改名為 back_point
。back_point
和 error_code
改為靜態變數,並進行封裝,
catch_end
的參數上限增加為十個,
#pragma once
#include <string.h>
/*back_point 's connecter, getter, setter*/
char **connect_back_point() {
static char *back_point;
return &back_point;
}
char *getter_back_point() {
return *connect_back_point();
}
void setter_back_point(char *set_back_point) {
*connect_back_point() = set_back_point;
}
#define connect_back_point() printf("For encapsulation, please don't use this function.");
/*error_code 's connecter, getter, setter*/
char **connect_error_code() {
static char *error_code = "";
return &error_code;
}
char *getter_error_code() {
return *connect_error_code();
}
void setter_error_code(char *set_error_code) {
*connect_error_code() = set_error_code;
}
#define connect_error_code() printf("For encapsulation, please don't use this function.");
/*throw*/
#define throw(ex_name, ...) \
\
setter_error_code(#ex_name); \
return __VA_ARGS__;
/*clear_throw*/
#define clear_throw() \
\
setter_error_code("");
/*check*/
#define check(...) \
\
if(strcmp(getter_error_code(), "")){ \
return __VA_ARGS__; \
}
/*try$*/
#define try$(back_point, args) \
\
if(strcmp(getter_error_code(), "")){ \
setter_back_point(#back_point); \
if(strcmp(args, "")) \
setter_error_code(args); \
goto catch_start;\
} \
back_point:
/*try*/
#define try(back_point, ...) try$(back_point, "" #__VA_ARGS__)
/*catch_start*/
#define catch_start(...) \
\
catch_start: \
if(!strcmp(getter_error_code(), "")) return __VA_ARGS__;
/*catch*/
#define catch(ex_name) \
\
if(!strcmp(getter_error_code(), #ex_name))
/*finally*/
#define finally()
/*back*/
#define back(back_point) \
\
if(!strcmp(getter_back_point(), #back_point)){ \
goto back_point; \
}
/*get_11th_arg*/
#define get_11th_arg(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, arg11, ...) arg11
/*magic_bracket*/
#define magic_bracket(...) (__VA_ARGS__)
#define magic_left_bracket(...) (__VA_ARGS__
/*back2 - 10*/
#define back2(arg2, arg1) back(arg2) back(arg1) printf("[Error] 沒有透過 try 進入 catch / 找不到相應的返回點");
#define back3(arg3, ...) back(arg3) back2 magic_bracket(__VA_ARGS__)
#define back4(arg4, ...) back(arg4) back3 magic_bracket(__VA_ARGS__)
#define back5(arg5, ...) back(arg5) back4 magic_bracket(__VA_ARGS__)
#define back6(arg6, ...) back(arg6) back5 magic_bracket(__VA_ARGS__)
#define back7(arg7, ...) back(arg7) back6 magic_bracket(__VA_ARGS__)
#define back8(arg8, ...) back(arg8) back7 magic_bracket(__VA_ARGS__)
#define back9(arg9, ...) back(arg9) back8 magic_bracket(__VA_ARGS__)
#define back10(arg10, ...) back(arg10) back9 magic_bracket(__VA_ARGS__)
/*back_list 10-1*/
#define back_list back10, back9, back8, back7, back6, back5, back4, back3, back2, back
/*catch_end*/
#define catch_end(...) \
\
setter_error_code(""); \
get_11th_arg magic_left_bracket(__VA_ARGS__), back_list) (__VA_ARGS__)
怕可移植性不夠的話, #pragma once
當然可以改成:
#ifndef __C_TRY_CATCH_H__
#define __C_TRY_CATCH_H__
/*code*/
#endif
然後 #include <string.h>
改成:
#ifndef __STRING_H__ //這是約定的命名規則
#define __STRING_H__
#endif
雖然幾乎所有的編譯器都支持 #pragma once
了。
/*main.c*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "C_try_catch.h"
void can_not_be_negative(double input) {
if (input < 0) {
throw(ex_neg);
}
}
double my_sqrt(double input) {
can_not_be_negative(input); check(0.0);
return sqrt(input);
}
int main() {
my_sqrt(-10); try(ex1);
my_sqrt(20); try(ex2);
my_sqrt(-30); try(ex3, anthor_ex);
/*... any things ...*/
system("pause");
catch_start(0);
catch (ex_neg) {
printf("[ex_neg] exception is happened!\n");
printf("Input can't no be negative.\n");
}
catch (anthor_ex) {
printf("[anthor_ex] exception is happened!\n");
}
finally() {
printf("exception is happened!\n\n");
}
catch_end(ex1, ex2, ex3);
}
[ex_neg] exception is happened!
Input can't no be negative.
exception is happened!
[anthor_ex] exception is happened!
exception is happened!
Press any key to continue . . .