Re: global variables - an alternate approach

For starters the emphasis is on 'global' variables common to muliple
translation units

Coding standard states that global variables should be defined as
static variables' within a class at public scope. One instance of
this class should exist and the recommendation is to use the singleton
design patten. IOW:

//common_data_b.h
# ifndef COMMON_DATA_B_H
# define COMMON_DATA_B_H

#include <iostream>
class common_data_b {
public :
   static int const a = 5 ;
   static const double pi ;
   static
   common_data_b& intance() {
     static common_data_b cd_b;
     return cd_b;
   }
};
#endif