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Full Discussion: Input arguments with C++
Top Forums Programming Input arguments with C++ Post 302756755 by Corona688 on Wednesday 16th of January 2013 12:43:20 PM
Old 01-16-2013
Since these are supposed to be global, putting them into a class doesn't make much sense, how about a namespace instead?

Code:
namespace options {
        int x, y, z;

        bool parse(int argc, char *argv[])
        {
                x=5;
                y=6;
                z=7;
        }
};

int main(int argc, char *argv[])
{
        if(!options::parse(argc, argv))
        {
                return(1);
        }

        printf("Got x %d\n", options::x);
        printf("Got y %d\n", options::y);
        printf("Got z %d\n", options::z);
        return(0);
}

That's with it all in one file. If you wanted the namespace accessible from multiple different C++ files, it'd be like this:

Code:
#ifndef __NS_H__
#define __NS_H__

namespace options {
        extern int x, y, z;
        bool parse(int argc, char *argv[]);
};

#endif/*__NS_H__*/

Code:
#include <stdio.h>
#include "ns.h"

int main(int argc, char *argv[])
{
        if(!options::parse(argc, argv))
        {
                return(1);
        }

        printf("Got x %d\n", options::x);
        printf("Got y %d\n", options::y);
        printf("Got z %d\n", options::z);
        return(0);
}

// These definitions only belong in one single file
int options::x=-1, options::y=-1, options::z=-1;

bool options::parse(int argc, char *argv[])
{
        x=5;
        y=6;
        z=7;
}

 

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LEARN ABOUT XFREE86

xtinitialize

XtInitialize(3Xt)					    XT COMPATIBILITY FUNCTIONS						 XtInitialize(3Xt)

NAME

       XtInitialize - initialize

SYNTAX

       Widget XtInitialize(String shell_name, String application_class, XrmOptionDescRec* options, Cardinal num_options, int* argc, char** argv);

ARGUMENTS

       shell_name
		 Specifies the name of the created shell widget.

       application_class
		 Specifies the class name of this application, which usually is the generic name for all instances of this application.

       options	 Specifies how to parse the command line for any application-specific resources.  The options argument is passed as a parameter to
		 XrmParseCommand.  For further information, see Xlib - C Language X Interface.

       num_options
		 Specifies the number of entries in the options list.

       argc	 Specifies a pointer to the number of command line parameters.

       argv	 Specifies the command line parameters.

DESCRIPTION

       XtInitialize calls XtToolkitInitialize followed by XtOpenDisplay with display_string NULL and application_name NULL, and finally calls
       XtAppCreateShell with application_name NULL, widget_class applicationShellWidgetClass, and the specified args and num_args and returns the
       created shell. The semantics of calling XtInitialize more than once are undefined. This routine has been replaced by XtAppInitialize.

SEE ALSO

       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

XFree86 							   Version 4.7.0						 XtInitialize(3Xt)
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