You can either press `C-j` to accept what you have typed so far, or `C-f` which will drop you into regular find-file

## Question
I have two compilers on my hardware C++ and C89

I&#39;m thinking about using C++ with classes but without polymorphism (to avoid vtables).
The main reasons I’d like to use C++ are:

-	I prefer to use “inline” functions instead of macro definitions.
-	I’d like to use namespaces as I prefixes clutter the code.
-	I see C++ a bit type safer mainly because of templates, and verbose casting.
-	I really like overloaded functions and constructors (used for automatic casting).

Do you see any reason to stick with C89 when developing for very limited hardware (4kb of RAM)?

## Conclusion
Thank you for your answers, they were really helpful! 

I thought the subject through and I will stick with C mainly because:
 
 1. It is easier to predict actual code in C and this is really important if you have only 4kb of ram. 
 2. My team consists mainly of C developers, so advanced C++ features won&#39;t be frequently used.
 3. I&#39;ve found a way to inline functions in my C compiler (C89).


It is hard to accept one answer as you provided so many good answers. 
Unfortunately I can&#39;t create a wiki and accept it, so I will choose one answer that made me think most.



Is there any reason to use C instead of C++ for embedded development?

I have a class that takes objects from a `BlockingQueue` and processes them by calling `take()` in a continuous loop.  At some point I know that no more objects will be added to the queue.  How do I interrupt the `take()` method so that it stops blocking?

Here&#39;s the class that processes the objects:

    public class MyObjHandler implements Runnable {

      private final BlockingQueue&lt;MyObj&gt; queue;
      
      public class MyObjHandler(BlockingQueue queue) {
        this.queue = queue;
      }
     
      public void run() {
        try {
          while (true) {
            MyObj obj = queue.take();
            // process obj here
            // ...
          }
        } catch (InterruptedException e) {
          Thread.currentThread().interrupt();
        }
      }
    }

And here&#39;s the method that uses this class to process objects:

    public void testHandler() {
    
      BlockingQueue&lt;MyObj&gt; queue = new ArrayBlockingQueue&lt;MyObj&gt;(100);  

      MyObjectHandler  handler = new MyObjectHandler(queue);
      new Thread(handler).start();

      // get objects for handler to process
      for (Iterator&lt;MyObj&gt; i = getMyObjIterator(); i.hasNext(); ) {
        queue.put(i.next());
      }

      // what code should go here to tell the handler
      // to stop waiting for more objects?
    }


How to interrupt a BlockingQueue which is blocking on take()?

My problem: I have Ido-mode enabled and I want to edit (for example) a file `.emacs` in my home directory. I have no `.emacs` file there, but I do have a `.emacs.d`, and so ido assumes that I want to enter the directory when I do `C-x C-f .emacs RET`.

I&#39;ve been trying to solve this for at least weeks, and I&#39;ve got a couple work-arounds but I would really rather not have to do anything crazy.

Ido mode is too smart, can I get it to NOT complete a filename?

<p>My problem: I have Ido-mode enabled and I want to edit (for example) a file <code>.emacs</code> in my home directory. I have no <code>.emacs</code> file there, but I do have a <code>.emacs.d</code>, and so ido assumes that I want to enter the directory when I do <code>C-x C-f .emacs RET</code>.</p>
<p>I've been trying to solve this for at least weeks, and I've got a couple work-arounds but I would really rather not have to do anything crazy.</p>


I am currently using GNU Emacs 23.0.93.1 in Windows Vista SP1. In my .emacs file I make a call to &lt;code&gt;(server-start)&lt;/code&gt; and that is causing an error with the message *The directory ~/.emacs.d/server is unsafe*. Has anyone seen this and know a fix or workaround? ... other than leaving server turned off ;) 

Here is the stack trace:

    Debugger entered--Lisp error: (error &quot;The directory ~/.emacs.d/server is unsafe&quot;)
      signal(error (&quot;The directory ~/.emacs.d/server is unsafe&quot;))
      error(&quot;The directory %s is unsafe&quot; &quot;~/.emacs.d/server&quot;)
      server-ensure-safe-dir(&quot;~\\.emacs.d\\server\\&quot;)
      server-start(nil)
      call-interactively(server-start t nil)
      execute-extended-command(nil)
      call-interactively(execute-extended-command nil nil)



Emacs - Error when calling (server-start)

How do I find a tab character in emacs?  

Find Tab Characters in emacs

I would like emacs to mark files that are generated as read-only when they&#39;re opened.  The part of the puzzle that I&#39;m missing is how to check if a file &quot;exists&quot;.  I currently have the following:

    ;;
    ;; get file extension
    ;;
    (defun get-ext (file-name)
      (car (cdr (split-string file-name &quot;\\.&quot;))))

    ;; 
    ;; get the base name of the file
    ;;
    (defun base-name (file-name)
      (car (split-string file-name &quot;\\.&quot;)))

    ;;
    ;; if an &#39;lzz&#39; file exists for this header, mark it as read only
    ;;
    (defun mark-read-only ()
      (if (string= (get-ext (cur-file)) &quot;h&quot;)
          (if ( ??file-exists??? (concat (base-name (cur-file)) &quot;.lzz&quot;) )
              (toggle-read-only))))

What can I use for &quot;???file-exists???&quot;?

Once I find this, I&#39;ll add &quot;mark-read-only&quot; to the appropriate hook (which I think is the find-file-hook).

**BACKGROUND**

We use [lzz][1] as a code generator to simplify our C/C++ development process.  Briefly, lzz takes a single input file (which looks very like C/C++) and generates header and source files as appropriate.

By default, lzz includes #line directives so that the debugger points to the original source and not the generated source, however, to reduce compilation dependencies we normally disable these directives in header files.  The result is that when debugging templates or inline functions, the debugger normally points to the generated header file and not the original source file.

This is not a big deal, however, recently I&#39;ve found that when debugging I&#39;ll make a quick modification to the displayed file and then I&#39;ll rebuild.  Of course this normally means that the change I made disappears because the file I edited is generated and so the changes are &quot;blown away&quot; during the library rebuild.

**SOLUTION**

Thanks to everyone for their help and comments.  A special thanks to [cobbal][2] for pointing out the correct function to use.

Here&#39;s the resulting code (with updates based on the other comments here too):

    (defun cur-file ()
      &quot;Return the filename (without directory) of the current buffer&quot;
      (file-name-nondirectory (buffer-file-name (current-buffer)))
      )

    (defun mark-generated-as-read-only ()
      &quot;Mark generated source files as read only.
    Mark generated files (lzz or gz) read only to avoid accidental updates.&quot;
      (if
          (or (string= (file-name-extension (cur-file)) &quot;h&quot;)
              (string= (file-name-extension (cur-file)) &quot;cpp&quot;))
          (cond
           (
            (file-exists-p (concat (file-name-sans-extension (cur-file)) &quot;.lzz&quot;))
            (toggle-read-only))
           (
            (file-exists-p (concat (file-name-sans-extension (cur-file)) &quot;.gz&quot;) )
            (toggle-read-only))
           )
        )
      )

   [1]: http://www.lazycplusplus.com/
   [2]: https://stackoverflow.com/users/73681/cobbal

How can I check if a file exists using Emacs Lisp?

If I know an emacs command name, says, &quot;goto-line&quot;; what if I want to query whether if there are any key-sequences bound to this command ?

And vice versa, given a key sequence, how can I find its command name ?



Given an emacs command name, how would you find key-bindings ? (and vice versa)

I&#39;m trying to edit some assembly code which tends to be formatted in long but thin listings.  I&#39;d like to be able to use some of the acres of horizontal space I have and see more code on-screen at one time.  Is there a method for getting Emacs (or indeed another editor) to show me multiple columns all pointing to the same buffer?

C-x 3 (emacs) and :vsplit (vim) are great for multiple separate views into the code, but I&#39;d like it to flow from one column to the other (like text in a newspaper).

Emacs - Multiple columns one buffer

I reciently switched to emacs starter kit which includes the ido package.

ido has a nice feature that suggests paths when find-file which is usually very handy except when trying to create a new file.  When the new file name matches a suggestion in another path ido automatically switches to that path assuming that&#39;s what I wanted, but usually its not and I find it annoying.   

To workaround the issue I either touch newfile from shell, create a new buffer and save as, or M-x find-file to get the original behavior.  I could of course rebind C-x C-f to find-file again but must of the time I like ido-find-file, I just want it to stop automatically switching paths when I type the path explicitly.      

I figure there is probably some simple key I can press during ido-find-file to tell it that the file I&#39;m looking for does not exist and to stop making suggestions, or some var I can set to get more desirable behavior?


Content Type	Original Author	Original Content on Stackoverflow
Question	quodlibetor	View Question on Stackoverflow
Solution 1 - Emacs	scottfrazer	View Answer on Stackoverflow

Ido mode is too smart, can I get it to NOT complete a filename?

Emacs Problem Overview

Emacs Solutions

Solution 1 - Emacs

How to interrupt a BlockingQueue which is blocking on take()?

Is there any reason to use C instead of C++ for embedded development?

Attributions