Solved

C and C++ libraries

Posted on 1998-10-27
9
174 Views
Last Modified: 2012-05-04
I have some libraries developed in C. These libs use variables names 'class' , 'new' etc which are keywords in C++. Please suggest me any option where I can use this libs in C++ without rewriting the libaries.

0
Comment
Question by:agvenkat
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
  • 2
  • +3
9 Comments
 
LVL 5

Expert Comment

by:scrapdog
ID: 1176264
use search and replace in your library to replace all instances of "class" with "Class", etc.

(or are keywords case insensitive?)

just a suggestion
0
 

Author Comment

by:agvenkat
ID: 1176265
hi,
  I am asking for some alternative as a lot of code used by
other C guys also need to be changed so please suggest an alternative.

regards
venkatesh

0
 
LVL 1

Expert Comment

by:willemnel
ID: 1176266
I'm afraid you'll have to rewrite (search and replace or whatever) some of the code if you want to use it in C++, since the words you're using are C++ key words and the compiler recognizes it as such.  As far as I know there's no way of getting around the compiler with this.
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 8

Expert Comment

by:Answers2000
ID: 1176267
-- Did you know you double submitted the question ???

I have answered the other copy of this question.  For some reason E-E won't let me post a answer on this version of the question.

agvenkat - If you like my answer to the other copy agvenkat you can delete this copy to get your pts back


0
 
LVL 5

Accepted Solution

by:
yonat earned 200 total points
ID: 1176268
You can wrap the C library with a facade which is C++ friendly. This means that your library reamins in C as-is (compiled using a C compiler) but that you provide an interface to it, in C, which does not contain any C++ keywords.

I'll use a trivial example to illustrate. Let's say the library contains only one function, declared in lib.h:
    int class(char* new);

You create a new C header file, CppLib.h, which contains the following declaration:
    extern "C" {
    int LibClass(char* inNew);
    }

It's corresponding CppLib.c file (compiled with the C compiler) will be:
    #include "lib.h"
    int LibClass(char* inNew)
    {
        return class(inNew);
    }

Your C++ program will #include the header CppLib.h, and not the original lib.h .

Now you have the same C library, compiled with a C compiler, but it is usable for C++ programs. All you need to write is the C++ friendly facade.

If you also have C++ keywords as fields in structs, unions or enums, the same principle apply: Declare a new struct, say, with the offensive field renamed, and let your facade translate it to the original struct when passing it on to the original library.

0
 
LVL 5

Expert Comment

by:yonat
ID: 1176269
Oops, I forgat to wrap the extern declaration...

Your CppLib.h should be:

    #ifdef __cplusplus
    extern "C" {
    #endif

    int LibClass(char* inNew);

    #ifdef __cplusplus
    }
    #endif

0
 
LVL 6

Expert Comment

by:thresher_shark
ID: 1176270
If you would like this duplicate question deleted, please respond and I will have customer service delete it.
0
 

Author Comment

by:agvenkat
ID: 1176271
thresher_shark please get the duplicate question deleted.

Thanks for your help

venkatesh

0
 
LVL 6

Expert Comment

by:thresher_shark
ID: 1176272
Oky doky, your problem has been solved :-)
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
IntroductionThis article is the second in a three part article series on the Visual Studio 2008 Debugger.  It provides tips in setting and using breakpoints. If not familiar with this debugger, you can find a basic introduction in the EE article loc…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

717 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question