Hi all,
This is a re-posting of a question I sent a few weeks back. Since then I've been flat out with project work, and so hadn't gotten back to the problem. Anyway, there was a typo in my email, which lead people to suspect that it was an error with my destructor definition; however this was a problem in the email not the actual code. Anyway, my apologies for the typo and subsequent confusion. What I am trying to figure out is how to develop an X application using C++. I am using g++ version 2.96 as my compiler. I am using a workstation running Redhat 7.0 using XFree86 version 4.0.1. My normal work requires me to program in C++, so I got a hold of a web-tutorial for X coding (http://www.comp.lancs.ac.uk/computing/users/sean/Motif-Workshop/workshop1.html), and, based on the information therein, started to write a simple class. To start off with, I thought I'd write a class called "X_application" to encapsulate all of the X initialisation code, so that subsequently I can just inherit from the class whenever I want to put an X app together. I wrote the following code in 3 files (X_application.H, X_application.C and main.C) : X_application.H: class X_application { public: X_application(); ~X_application(); }; X_application.C: #include "X_application.H" X_application::X_application() { } X_application::~X_application() { } main.C: #include "X_application.H" int main(int argc, char **argv) { X_application x_app; } ... This compiles fine. I then added the following code to X_application.C #include <Xm/Xm.h> such that X_application.C now looked like this: #include "X_application.H" #include <Xm/Xm.h> X_application::X_application() { } X_application::~X_application() { } and then tried to compile. This resulted in a stream of errors, apparently from /usr/include/X11/Xlib.h, of the form: /usr/include/X11/Xlib.h:211: syntax error before `:' After discussion with a collegue, I swapped the #include "X_application.H" and #include <Xm/Xm.h> So that <Xm/Xm.h> came first. A fresh compile lead to two errors: X_application.C:4: syntax error before `::' X_application.C:8: syntax error before `::' This lead me to suspect that there was a problem relating to using C and C++ headers together, so I wrapped the #include <Xm/Xm.h> such that X_application.C now looked like this: extern "C" { #include <Xm/Xm.h> } #include "X_application.H" X_application::X_application() { } X_application::~X_application() { } A re-compile of this code however produced exactly the same errors. My next step was to get onto Google.com and do a search for "Xm.h " and "g++". The results of this indicated to me that there is a known problem with the X headers that make it complain when it comes across C++ code. My question: Is there any way around this? Based on a few usenet posts that I came across, I have tried compile flags such as: -fpermissive and -fhonor-std to no avail. Short of writing all the X code in straight C in a seperate file and then extern "C" ing each of the functions (which strikes me as ugly and a real pain), I am not sure how else to proceed. Is there some workaround for this short of the pure C option? thanks heaps David Buddrige Software Engineer Logica _______________________________________________ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
