Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

can I CALL c++ METHODS FROM  A c PROGRAM ?

Posted on 2000-02-24
2
Medium Priority
?
199 Views
Last Modified: 2010-04-02
HI,

can I CALL c++ METHODS FROM  A c PROGRAM ?

THANKS in advance.


0
Comment
Question by:tridev
  • 2
2 Comments
 
LVL 3

Expert Comment

by:Norbert
ID: 2553641
without any atribute - no
C++ mangles functionnames to code parametertype, number of parameters and so on to the function name. - That is the reason why function names looks so cryptic if the linker detects unresolved external functions.
But to switch of this mageling you can declare a function as
extern "C" Returntype Func(Parameter1Type P1 ,Parameter2Type P2,...,...)
in that case you only can use the features C provides.
Polimorph. functions are not possible for extern "C" declared functions. But
these functions now resides inside the C++ part they can call real C++ functons.
So you are able to write wrapper functions for the real C++ functions with full support to C++ functions
example:
Add(int Var1,int Var2, int* Result)
{
    *Result=Var1+Var2
}
Add(double Var1,double Var2, double* Result)
{
    *Result=Var1+Var2
}

extern "C" AddInt(int Var1,int Var2, int* Result)
{
    Add(Var1,Var2,Result);
}
extern "C" AddDouble(double Var1,double Var2, double* Result)
{
    Add(Var1,Var2,Result);
}
you can call AddInt or AddDouble fron C Code but you can't call Add directly from C

The example above makes no sense
because you can use + to do adding but it shows what I mean
0
 
LVL 3

Accepted Solution

by:
Norbert earned 30 total points
ID: 2553646
I forgot to switch from comment to answer.
My previous comment should be an answer
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

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

C++ Properties One feature missing from standard C++ that you will find in many other Object Oriented Programming languages is something called a Property (http://www.experts-exchange.com/Programming/Languages/CPP/A_3912-Object-Properties-in-C.ht…
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.

963 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