WebJun 23, 2024 · 宏(Macro)本质上就是代码片段,通过别名来使用。. 在编译前的预处理中,宏会被替换为真实所指代的代码片段,即下图中 Preprocessor 处理的部分。. 根据用法的不同,分两种,Object-like 和 … WebThe man page for cmake covers this. "#cmakedefine VAR will be replaced with either #define VAR or /* #undef VAR */ depending on the setting of VAR in CMake." Note that VAR is the CMake variable name and not its value. PROJ_BUILD_DIR_CMAKEDEFINE does not exist as a CMake variable in your project so its CMake value is false and you …
C/C++高级特性之——预处理器中的宏(Macro)#define
WebMar 1, 2024 · #define Debug( x ) debug != NULL && *debug << x; It's somewhat dangerous, however, since you can't take the usual precaution of putting the argument in parentheses. (On the other hand, I've seen it used in a number of applications, without problems.) Web在 C 语言中,可以采用命令 #define 来定义宏。. 该命令允许把一个名称指定成任何所需的文本,例如一个常量值或者一条语句。. 在定义了宏之后,无论宏名称出现在源代码的何处,预处理器都会把它用定义时指定的文本替换掉。. 这两行代码为值 100 定义了一个 ... st teresa of avila cincinnati
宏(计算机术语)_百度百科
http://duoduokou.com/cplusplus/17708832457702350837.html Web5 Answers. Sorted by: 269. \def is a TeX primitive, \newcommand is a LaTeX overlay on top of \def. The most obvious benefits of \newcommand over \def are: \newcommand checks whether or not the command already exists. \newcommand allows you to define an optional argument. In general, anything that \newcommand does can be done by \def, but it ... Web列表可能相当长,并且根据项目的构建类型而变化.我曾尝试考虑使用X-Macros,但我认为我会遇到同样的问题.我希望有人可以看到一种创建预处理器宏的方法,以使我能够实现原始的糖语法?任何洞察力都非常感谢. st teresa of avila elmira