Although the compiler doesn't have a separate preprocessor, the directives described in this section are processed as if there were one. You use them to help in conditional compilation. Unlike C and C++ directives, you can't use these directives to create macros. A preprocessor directive must ...
The preprocessor directives instruct the compiler how to treat the source code. For example, under certain conditions, you might want the compiler to ignore portions of the code, and under other conditions, you might want that code compiled. The preprocessor directives give you those options and ...
nothing, in this case the directive has no effect. a line break. Themodule and import directivesare also preprocessing directives. (since C++20) Preprocessing directives must not come from macro expansion. #define EMPTYEMPTY# include <file.h> // not a preprocessing directive ...
C-preprocessor directives v17 Suggest edits The ECPGPlus C-preprocessor enforces two behaviors that depend on the mode in which you invoke ECPGPlus: PROC mode Non-PROC mode Compiling in PROC mode In PROC mode, ECPGPlus allows you to:...
编译器符号是在编译时定义的关键字,可以检查该关键字以有条件地执行特定的代码段。有三种方法可以定义编译器符号。它们可以通过代码定义:#define MYSYMBOL 它们可以在 Visual Studio 中的项目属性>构建>条件编译符号下定义:(请注意,DEBUG 和TRACE 有自己的复选框,不需要明确指定。)或者可以使用 C#编译器 csc.exe ...
预处理程序指令通常用于使源程序易于更改,并且易于在不同的执行环境中编译。源文件中的指令告诉预处理器执行特定操作。例如,预处理器可以替换文本中的标记,将其他文件的内容插入到源文件中,或者通过删除文本部分来禁止编译部分文件。在宏扩展之前识别并执行预处理器行。因此,如果宏扩展为看起来像预处理器命令的内容,则...
在需要跳过某些操作时,可以方便地在项目级别设置自定义条件预处理。 转到Solution Explorer- >点击 Right Mouse 你要设置变量的项目 - >Properties- >Build- >一般找到字段Conditional compilation symbols并在这里输入你的条件变量 代码示例将跳过一些代码:
Although the compiler doesn't have a separate preprocessor, the directives described in this section are processed as if there were one. You use them to help in conditional compilation. Unlike C and C++ directives, you can't use these directives to create macros. A preprocessor directive must ...
Although the compiler doesn't have a separate preprocessor, the directives described in this section are processed as if there were one. You use them to help in conditional compilation. Unlike C and C++ directives, you can't use these directives to create macros. A preprocessor directive must ...
The preprocessor directives instruct the compiler how to treat the source code. For example, under certain conditions, you might want the compiler to ignore portions of the code, and under other conditions, you might want that code compiled. The preprocessor directives give you those options and ...