有没有办法“扩展” #define 指令？
我的项目中有很多“愚蠢的”#define，我想删除它们。不幸的是，我无法进行简单的搜索和替换，因为 #define 已参数化。例如：
#define FHEADGRP( x ) bool _process_grp##x( grp_id_t , unsigned char )
这用于生成几个函数的标头。我想以某种方式做与预处理器相同的事情 - 用它的结果替换宏的每个调用（插入正确的参数。我希望你明白我想要做什么。
我发现使用 Visual Studio，可以得到不幸的是，这对我没有帮助，因为该文件被数千个其他行“污染”，并且所有 #defines 都已扩展。一些宏，最好在我的 IDE（即 Visual Studio）中执行，有什么办法可以实现这一点吗？
I have a lot of "stupid" #define in a project and I want to remove them. Unfortunately, I can't do a simple search and replace, since the #define is parameterized. For example:
#define FHEADGRP( x ) bool _process_grp##x( grp_id_t , unsigned char )
This is used to generate headers of a couple of functions. I would like to somehow do the same thing as the preprocessor does - replace each call of the macro by its result (with correct parameters inserted. I hope you understand what I want to do.
I found out that with Visual Studio, one can get the preprocessed intermediate files with the /P option. Unfortunately, this does not help me, since the file is "polluted" with thousands of other lines and with all #defines expanded. I do not want to do this, I just want to expand some of the macros and preferably do it in my IDE (which is Visual Studio). Is there any way how to achieve this?
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呃，我建议你使用 sed， http://www.gnu.org/software/sed/ ，或其他正则表达式工具。
Uh I would advise you to use sed, http://www.gnu.org/software/sed/, or another regex tool.
通常，您可以使用 gcc -E 获取预处理器的输出（当然假设您使用的是 gcc，尽管其他编译器往往具有相同的功能）。
当然，处理该文件以自动将
#define扩展为其他文本并不是一项简单的任务。我可能会编写一个 shell 脚本（或 Perl，因为我认为它在处理文本方面要好得多）来自动执行任务。在 Visual Studio 中，您可以使用
/P执行相同的操作。可以根据此页面< /a>.You can normally get the output of the preprocessor with
gcc -E(assuming you're usinggccof course, though other compiler tend to have the same feature).Of course, processing that file to automatically expand the
#define's into other text is not a trivial task. I'd probably write a shell script (or Perl since it's a lot better at massaging text in my opinion) to automate the task.In Visual Studio, you can use
/Pto perform the same operation. This can be set in the IDE according to this page.是的，有 - 因为您使用的是 Visual Studio。
Visual Studio IDE 具有强大的搜索和搜索功能。更换机制。您似乎认为它只能处理文字字符串。它可以做得更多。按 Ctrl-Shift-H 进行全局搜索和替换。在“查找选项”中，选择“使用：通配符”。
现在将
FHEADGRP(*)替换为bool _process_grp\1( grp_id_t , unsigned char )通配符为
*和\1< /code> 是反向引用。[编辑]
宏适用于标记化源，但搜索和替换适用于字符。这可能会导致一个小问题。考虑
FHEADGRP(Foo)和FHEADGRP( Foo )的情况。对于 C 宏，它们是等效的，但在第二种情况下，反向引用将扩展为Foo- 带空格。解决方法是使用正则表达式，特别是将
FHEADGRP\(:b*(.*):b*\)替换为bool _process_grp\0( grp_id_t , unsigned char )。我发现VS2005的实现有点bug；例如，简单的?表达式无法匹配单个空格。但上面的例子应该可以工作。Yes, there is - since you're using Visual Studio.
The Visual Studio IDE has a powerful search & replace mechanism. You seem to assume it can only handle literal strings. It can do more. Hit Ctrl-Shift-H for a global search and replace. In the "Find options", select "Use: Wildcards".
Now replace
FHEADGRP(*)bybool _process_grp\1( grp_id_t , unsigned char )The wildcard is
*, and\1is the backreference.[edit]
Macros work on the tokenized source, but Search&Replace works on characters. This can cause a slight problem. Consider the cases
FHEADGRP(Foo)andFHEADGRP( Foo ). For a C macro, they're equivalent, but in the second case the backreference will expand toFoo- with spaces.The workaround is to use regexes, in particular replace
FHEADGRP\(:b*(.*):b*\)withbool _process_grp\0( grp_id_t , unsigned char ). I find that the VS2005 implementation is a bit buggy; for instance the simple?expression fails to match a single space. But the example above should work.