Tips and tricks using the preprocessor (part one)by Anders Lindgren, IAR Systems The #include directive The most straight-forward preprocessor directive is #include. When the preprocessor finds this directive it simply opens the file specified and inserts the content of it, as though the content ...
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。 C/C++ 代码编译过程 - 图片来自ntu.edu.sg 根据用法的不同,分两种,Object-like 和 Function-like。前者用于 Object 对象,后者用于函数方法。 C/C++ 代码编译过程中,可通...
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。 C/C++ 代码编译过程 - 图片来自 ntu.edu.sg 根据用法的不同,分两种,Object-like 和 Function-like。前者用于 Object 对象,后者用于函数方法。 C/C++ 代码编译过程中,可通过相应参数来获取到各编译步骤中的产出,比如想...
原来答案中的代码片段属于半成品,并没有写成和写完整,所以删除。 此外,我还查找到下面的链接,将 C preprocessor 在宏展开中的优先级次序问题,可能和题主的提问不是完全相关,但我觉得也蛮重要,因此补充叙述如下: C preprocessor 这里主要提到了 C preprocessor 对 funtion-like macro 展开时的一些处理步骤的优先级问...
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。 C/C++ 代码编译过程 - 图片来自 ntu.edu.sg 根据用法的不同,分两种,Object-like 和 Function-like。前者用于 Object 对象,后者用于函数方法。
In this chapter, we expand the discussion to include all other capabilities of the preprocessor such as the #undef directive, the use of the conditional compilation directives #if, #ifdef, #ifndef, #else, #elif and #endif , string concatenation and token pasting. In addition, parameters for ...
Visual Studio 2010 simulated variadic templates—for example, make_shared<T>(arg1, arg2, argN)—up to a limit of 10 arguments, by stamping out overloads and specializations with preprocessor machinery. In Visual Studio 2012, this limit is reduced to five arguments to improve compile times and...
String Concatenation Standard C preprocessors concatenate adjacent strings in the input program printf("hello" "world"); #if #if can be used to test the value of preprocessor constants. A constant integer expression is evaluated. This may not include sizeof, any casts or any enumerated types. ...
This creates a preprocessed foo.i output file even though the compiler now normally uses an integrated preprocessor. When used in combination with the -x command line option, -save-temps is sensible enough to avoid over writing an input source file with the same extension as an intermediate ...
does not happen when the substitution occurs in the context of a stringification or token concatenation operator. All this is consistent with the standard. The novelty is that this macro-expansion does not occur either when the parameter appears in a nested preprocessor directive or multiline macro...