Solved

C and C++ libraries

Posted on 1998-10-27
2
181 Views
Last Modified: 2010-04-02
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
2 Comments
 
LVL 8

Accepted Solution

by:
Answers2000 earned 200 total points
ID: 1176273
1. search and replace in the library:  As already suggested (this much is obvious)

"class"  --- becomes "_Class"
"new"    --- becomes "_New"
etc.  (or whatever variation you like on the naming)


2. The programmers who use the library from C - include a header file right - modify this header with something like: (insert this at the top)

#ifndef __cplusplus
#define class  _Class
#define new    _New
/* etc.. */
#endif

The compiler defines __cplusplus automatically when compiling C++ programs, but not when compiling C.  The macros hence allow use of the original names in C programs only.

The C programs will have to recompile their programs (they'd have to do this anyway to use a new version of the library), but will NOT need to make any source changes.

Finally if there are different headers, and some C programs include one, some include others, etc... stick this code into a new header, and then #include from the top of all your real headers:-

#ifndef BACKWARDCOMPATIBLE
#define BACKWARDCOMPATIBLE

#ifndef __cplusplus
#define class  _Class
#define new    _New
/* etc.. */
#endif

#endif


4. Modify all library source code (global search and replace) to use the new names if you want the library to compile in C++.  Make sure the headers that the C programs use only have C style code.  Also make sure that any functions have extern "C" style linkage

5. Rebuild the library

- C programs recompile with the library,   They can use either the old or the new names
- New C++ programs,  must use the new names
- The library uses the new names internally
0
 
LVL 7

Expert Comment

by:linda101698
ID: 1176274
I added the 200 points deducted from your account by the duplicate question back to your account.  Since Answers2000 had actually posted the correct answer first, I felt that he/she should get the credit for their answer.

Linda Gardner
Customer Service @ Experts Exchange
0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

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

Suggested Solutions

Templates For Beginners Or How To Encourage The Compiler To Work For You Introduction This tutorial is targeted at the reader who is, perhaps, familiar with the basics of C++ but would prefer a little slower introduction to the more ad…
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

786 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