是否存在预处理器'AND'指令

Question

是否有Preproccessor AND指令？如果不是，你会怎么建议我解决以下任务？

#define INSTALL_V8
#define INSTALL_V9
#define INSTALL_V10  // Using preprocessor directives and not static variables to
// avoid packaging unnecessary code into the application/installer

#ifdef INSTALL_V8 AND INSTALL_V9 AND INSTALL_V10
  #define CHECK_BOX_STRT_Y 60 // move the start y up so we have room to fit 3 checkboxes in the window
#else
  #define CHECK_BOX_STRT_Y 80 // place 1st checkbox in middle of window
#endif

Answer 1

您可以像这样使用defined：

#if defined(INSTALL_V8) && defined(INSTALL_V9) && defined(INSTALL_V10)

Answer 2

嵌套条件

#ifdef CONDITION1
# ifdef CONDITION2
# endif
#endif