while 动作 redo 化

最新推荐文章于 2021-06-29 21:27:47 发布

原创最新推荐文章于 2021-06-29 21:27:47 发布 · 198 阅读

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本文深入探讨了宏定义实现重复执行代码片段的机制，通过宏REDO_N和函数redo_fun，实现了任意次数的代码重复执行，特别适用于矩阵运算等场景。文章提供了具体的宏定义和函数实现，展示了如何在矩阵加法中应用此机制。



#ifndef _ReDo_H_
#define _ReDo_H_

#define REDO_1(ACT)   do{ ACT; }while(0)
#define REDO_2(ACT)   do{ REDO_1(ACT);REDO_1(ACT); }while(0)
#define REDO_3(ACT)   do{ REDO_2(ACT);REDO_1(ACT); }while(0)
#define REDO_4(ACT)   do{ REDO_3(ACT);REDO_1(ACT); }while(0)
#define REDO_5(ACT)   do{ REDO_4(ACT);REDO_1(ACT); }while(0)
#define REDO_6(ACT)   do{ REDO_5(ACT);REDO_1(ACT); }while(0)
#define REDO_7(ACT)   do{ REDO_6(ACT);REDO_1(ACT); }while(0)
#define REDO_8(ACT)   do{ REDO_7(ACT);REDO_1(ACT); }while(0)
#define REDO_9(ACT)   do{ REDO_8(ACT);REDO_1(ACT); }while(0)
#define REDO_10(ACT)  do{ REDO_9(ACT);REDO_1(ACT); }while(0)
#define REDO_11(ACT)  do{ REDO_10(ACT);REDO_1(ACT); }while(0)
#define REDO_12(ACT)  do{ REDO_11(ACT);REDO_1(ACT); }while(0)
#define REDO_13(ACT)  do{ REDO_12(ACT);REDO_1(ACT); }while(0)
#define REDO_14(ACT)  do{ REDO_13(ACT);REDO_1(ACT); }while(0)
#define REDO_15(ACT)  do{ REDO_14(ACT);REDO_1(ACT); }while(0)
#define REDO_16(ACT)  do{ REDO_15(ACT);REDO_1(ACT); }while(0)
#define REDO_N(ACT,N)  REDO_##N(ACT)

#define  redo_fun(ACT,N)  do{int loopn = (N);        \
                              while(loopn>=8)        \
                              {                      \
                              loopn-=8;              \
                              REDO_8(ACT);           \
                              }                      \
                             switch(loopn)           \
                             {                       \
                             case 7:REDO_7(ACT);break;     \
                             case 6:REDO_6(ACT);break;     \
                             case 5:REDO_5(ACT);break;     \
                             case 4:REDO_4(ACT);break;     \
                             case 3:REDO_3(ACT);break;     \
                             case 2:REDO_2(ACT);break;     \
                             case 1:REDO_1(ACT);break;     \
                             }                             \
                            }while(0)                                                                                           
                           
                             


#endif

void Matrix_add(double *a ,double *b ,double *c ,int lenth)
{
  
redo_fun( *a++ = *b++ + *c++; , lenth  );
}

while 动作 redo 化

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