Function 类函数宏定义

问题是，我不太明白下面的定义是什么。谁能给我解释一下吗

#define Vpc3MemSet_( _pToVpc3Memory, _bValue, _wLength )\
           Vpc3MemSet( _pToVpc3Memory, _bValue, _wLength )

---

你的宏几乎什么都不做。它用

Vpc3MemSet

（不带下划线）替换

Vpc3MemSet

（带下划线）。如果存在不同的、依赖于平台的变体（例如Linux、macOS和Windows），则此类宏通常是有意义的。对于（虚构的）示例：

您可以使用相同的宏调用调用平台相关函数：

Vpc3MemSet_(memory, value, length);

---

这将扩展到Windows和Linux上的不同函数调用。这是整个#定义顺序：

#if VPC3_SERIAL_MODE


 #define CopyToVpc3_( _pToVpc3Memory, _pLocalMemory, _wLength )\
           CopyToVpc3( _pToVpc3Memory, _pLocalMemory, _wLength )

 #define CopyFromVpc3_( _pLocalMemory, _pToVpc3Memory, _wLength )\
           CopyFromVpc3( _pLocalMemory, _pToVpc3Memory, _wLength )

 #define Vpc3MemSet_( _pToVpc3Memory, _bValue, _wLength )\
           Vpc3MemSet( _pToVpc3Memory, _bValue, _wLength )

 #define Vpc3MemCmp_( _pToVpc3Memory1, _pToVpc3Memory2, _wLength )\
           Vpc3MemCmp( _pToVpc3Memory1, _pToVpc3Memory2, _wLength )

#else

 #define CopyToVpc3_( _pToVpc3Memory, _pLocalMemory, _wLength )\
           memcpy( _pToVpc3Memory, _pLocalMemory, _wLength )

 #define CopyFromVpc3_( _pLocalMemory, _pToVpc3Memory, _wLength )\
           memcpy( _pLocalMemory, _pToVpc3Memory, _wLength )

 #define Vpc3MemSet_( _pToVpc3Memory, _bValue, _wLength )\
           memset( _pToVpc3Memory, _bValue, _wLength )

 #define Vpc3MemCmp_( _pToVpc3Memory1, _pToVpc3Memory2, _wLength )\
           memcmp( _pToVpc3Memory1, _pToVpc3Memory2, _wLength )

#endif /* #if VPC3_SERIAL_MODE */

因此，这四个函数有两个定义，这取决于您是处于串行模式还是并行模式。但是，在应用程序源文件中调用memset（）函数，如下所示：

 /*-----------------------------------------------------------------------*/
 /* init application data                                                 */
 /*-----------------------------------------------------------------------*/
  memset( &sDpAppl, 0, sizeof( sDpAppl ) );

 /*-----------------------------------------------------------------------*/
 /* initialize VPC3                                                       */
 /*-----------------------------------------------------------------------*/
 #if VPC3_SERIAL_MODE
  Vpc3AsicAddress = (VPC3_ADR)VPC3_ASIC_ADDRESS;
  pVpc3 = &sVpc3OnlyForInit;
  pDpSystem = &sDpSystemChannel1;

  memset( pVpc3, 0, sizeof( VPC3_STRUC ) );
#else
  pVpc3Channel1 = (VPC3_STRUC_PTR)VPC3_ASIC_ADDRESS;
  Vpc3AsicAddress = (VPC3_ADR)VPC3_ASIC_ADDRESS;
  pVpc3 = pVpc3Channel1;
  pDpSystem = &sDpSystemChannel1;
#endif//#if VPC3_SERIAL_MODE

好像这是一个不同的功能。或者，我还缺少什么吗？：/ 顺便说一下，我处于串行模式，并且已经定义了CopyToVpc3（）、CopyFromVpc3（）、Vpc3MemSet（）、Vpc3MemCmp（）

 /*-----------------------------------------------------------------------*/
 /* init application data                                                 */
 /*-----------------------------------------------------------------------*/
  memset( &sDpAppl, 0, sizeof( sDpAppl ) );

 /*-----------------------------------------------------------------------*/
 /* initialize VPC3                                                       */
 /*-----------------------------------------------------------------------*/
 #if VPC3_SERIAL_MODE
  Vpc3AsicAddress = (VPC3_ADR)VPC3_ASIC_ADDRESS;
  pVpc3 = &sVpc3OnlyForInit;
  pDpSystem = &sDpSystemChannel1;

  memset( pVpc3, 0, sizeof( VPC3_STRUC ) );
#else
  pVpc3Channel1 = (VPC3_STRUC_PTR)VPC3_ASIC_ADDRESS;
  Vpc3AsicAddress = (VPC3_ADR)VPC3_ASIC_ADDRESS;
  pVpc3 = pVpc3Channel1;
  pDpSystem = &sDpSystemChannel1;
#endif//#if VPC3_SERIAL_MODE