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From: ldg@drywit.ATT.COM (XGPB30000-GibbonsD(DRR6702)262)
Newsgroups: comp.lang.c++
Subject: Re: calling C++ from C
Message-ID: <8258@drutx.ATT.COM>
Date: 19 Apr 91 18:54:13 GMT
References: <1991Apr15.154120.13484@murdoch.acc.Virginia.EDU>
Sender: news@drutx.ATT.COM
Reply-To: ldg@drywit.ATT.COM
Lines: 33

From article <1991Apr15.154120.13484@murdoch.acc.Virginia.EDU>, by pts@faraday.clas.Virginia.EDU (Paul T. Shannon):
> Though many books explain how to call C functions from C++, I'm 
> having difficulty figuring out how to do the opposite.  
> 
> I have a large C program, built from several modules of Ansi C 
> code.  I want to add two C++ modules to this, and call the member 
> functions from the C program.
> 
> Do I have to determine how my compiler (Turbo C++ version 1.01) 
> mangles names, and then call the member functions with those
> names?

C++ provides a mechanism for this. In your C++ program you provide
something like

extern "C"
void
CallableFromC()
{
	// your C++ code here
}

The above function has "C" linkage, which in implementation
terms means its name is not mangled.

Invoking member functions from C is a bit trickier - wrap 
each call in a function as above to avoid the mangling
issues. 
--
--------------------------------------------------------------------------------
-- Doug Gibbons			| ldg@druhi.ATT.COM or att!druhi!ldg
-- AT&T Bell Laboratories 
-- Denver CO