?
Solved

About map..

Posted on 2002-07-30
6
Medium Priority
?
187 Views
Last Modified: 2010-04-01
Hi Friends
       i have a problem... i have a file(say file1.cxx) in which i declare a map & through a function on this file say enter i can insert value in this map..now i want to call this function from another file having extension .c & wants to enter value in it from that file..but linker error comes .. how it can be possible..

bye
Jonmac
0
Comment
Question by:JonMac
6 Comments
 
LVL 3

Accepted Solution

by:
MDarling earned 200 total points
ID: 7187668
put

extern "C"

on the front of your function.

This will stop C++ name mangling and make it callable from your C file.
0
 
LVL 3

Expert Comment

by:MDarling
ID: 7187675
=== main.c ===

#include "myheader.h"

int main()
{
    map_insert("hello");
    map_insert("world");
    return 0;
}

=== header file ===

#ifndef myheader_h
#define myheader_h

#ifdef __cplusplus
extern "C" {
#endif

int map_insert(char* s);

#ifdef __cplusplus
};
#endif

#endif


=== C++ Source ===

#include "myheader.h"
#include <iostream>

using namespace std;

int map_insert(char* s)
{
    cerr << s << ' ';
    return 0;
}
0
 
LVL 30

Expert Comment

by:Axter
ID: 7188164
Which are you trying to do?

[1] Are you trying to access a function in a *.cxx file from a *.c file?

OR

[2] Are you trying to access a function in a *.c file from a *.cxx file?
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 30

Expert Comment

by:Axter
ID: 7207692
JonMac,
Did you forget this question?
0
 
LVL 11

Expert Comment

by:griessh
ID: 7439585
Dear

I think you forgot this question. I will ask Community Support to close it unless you finalize it within 7 days. You can always request to keep this question open. But remember, experts can only help you if you provide feedback to their questions.
Unless there is objection or further activity,  I will suggest to accept

     "MDarling"

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
======
Werner
0
 
LVL 6

Expert Comment

by:Mindphaser
ID: 7479729
Force accepted

** Mindphaser - Community Support Moderator **
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

When writing generic code, using template meta-programming techniques, it is sometimes useful to know if a type is convertible to another type. A good example of when this might be is if you are writing diagnostic instrumentation for code to generat…
Introduction This article is a continuation of the C/C++ Visual Studio Express debugger series. Part 1 provided a quick start guide in using the debugger. Part 2 focused on additional topics in breakpoints. As your assignments become a little more …
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 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.
Suggested Courses

807 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