Will this regex be enough to remove C++ multiline comments? -

-

I need to parse some C ++ files, and to make things easier for me, I thought about removing the following regesx: / (\ / \ *. *? \ * \ /) / , using multiline modifier, and it starts working Do you think there will be such a case where it will fail?

The following is hurting you: 

  std :: Cout & lt; & Lt; "Some / * source code printing /

This is a perfect example. Imagine what you could do if the string made a comment Started and did not finish it? You can eliminate the huge amounts of your code.

A regex can give you a good "quick and dirty" solution, and can work in your special case (I want to make sure you have a pass before "remove all matches" before "all in Remove and print "), but in the general case, you will need a more sophisticated parser. You may be able to account for this situation with a regex, but it will become ugly.

EDIT: Thanks to @Mimeters in comments, I have realized that your problem is a bit more involved than just source files, although speaking strictly if you have an embedded tip If you use macros with macros, then you are asking for trouble, after some tests, it has been found that most machines have a device installed with the C ++ compiler, which will leave the comments, and all the nimble for you String and macro issues will be handled. To get output without comment (single or multi-line), use it on file.cpp : 

  cpp file.cpp

Sure, it will expand all macros and #include s, and you may not have such a very well organized formatting, but it's easy to read all the macros, strings and other related If you do not know with a comment, you can not solve the problem, CPP is a standalone person There is no C preprocessor as inefficient (theoretically you have the same code-similar syntax as in #include s and #define s and in any language), so if If you do not have this, you can get similar effects with GCC: 

  gcc -E file.cpp

( GCC to G ++ If you really care, you can handle it; it is better to have #include & lt; iostream & gt; )

Removing a comment, where As far as I know, the preprocessor is not strictly part of it, but most preprocessor does the actual level of parser (well, in the stage of simplifying the syntax of the preprocessor of GCC, to be tried). So if your compiler's preprocessor option does this for you, and this is what you want to do then stop your own rolling.

I am sorry to think about this. I do not know how it got saved.


Comments

Post a Comment

Popular posts from this blog

MySql variables and php -

-
I am getting an error with php in order to format mysql_query () in php to format this string What is the right way? SELECT SELECT SELECT (*) Agents @AgentCount; User_Agent_English, User_Angent_Oursal, US.___Gent_Aginal, COUNT (User_Agent_Percade) ACC, COUNT (*) / (AgentCount) Percentage by agents user_agent_preser order DEC limit limit 50; In PHP, how am i setting $ query $ query = "SELECT count (*) agents @ agentcount; SELECT user_agent_parsed, User_agent_original , COUNT (user_agent_parsed) ascount, COUNT (*) / (@AgentCount) as a percentage by user_agent_parced by URI date DESC limit 50 "; This exact query will work properly if I put it in MySQL directly through a command line session. Do I need to release two separate php calls from mysql_query () and store the results first? I get the following error: There is an error in your SQL syntax; Instead of using a sub-selection and instead of using the 'SELECT user_agent_parsed, user_agent_original, ne...
Read more

url rewriting - How to implement the returnurl like SO in PHP? -

-
This URL should work even after the rewrite. Is this possible? Otherwise, I can only hardcoded everything If you are trying to create a login system with redirection You need to use the HTTP_REFERER header to find out where the user came from so that you can send it back there. The best way to do this is to use something like this in your login form: // - Login php & Lt; Input type = "password" name = "password" /> & Lt; Input type = "hidden" name = "returnrelale" value = "& lt ;? php echo $ redirectURL ;? & gt;" / & Gt; & Lt; / Form & gt; Please note that some ISP, browser or proxy will delete the referrer header, so you can not rely on each user to work fully. If you use a statement, to check whether the header exists or not, you can send those users back to the homepage or whatever. Edit If you are looking to use $ _SERVER ['REQUEST_URI'], if you are running Apache It sho...
Read more

kernel - How to create a "Block device" in Windows -

-
For people familiar with Linux, it is possible to create a module and register it as a block device. This allows the user to mount it as a regular disk (whereas all block I / O is controlled by the module, for example USB-MastStorage). Is there a way to do this in windows? (Windows needs to create a volume. Raw data will come from the interface with justification.) Thanks The easiest way (and this is not easy!) Is to write one, you can do it also with KMDF. The latest issue of the "NT Insider" of the OSR is an article in how to do this, but it not is going to be easy anyway You will learn a ton, though, So if you are interested in kernel development, then this is a good way to start!
Read more