StaticID.h

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/* This file is part of gbLAB.
 *
 * gbLAB is distributed without any warranty under the MIT License.
 */
 
 
#ifndef gbLAB_STATICID_H_
#define gbLAB_STATICID_H_
 
 
namespace gbLAB
{
    
    /************************************************************/  
    /************************************************************/
    template<typename Derived>
    class StaticID
    {
 
        // The increment
        static size_t increment;
        
        // The incremental counters
        static size_t count;
        static bool count_used;
        
    public:
        
        const  size_t sID;
        
        /**********************************************************************/
        StaticID() : sID(count)
        {
            count_used=true;
            count+=increment;
        }
        
        /**********************************************************************/
        StaticID(const StaticID&) : sID(count)
        {
            count_used=true;
            count+=increment;
        }
        
        /**********************************************************************/
        static size_t nextID()
        {
            return count;
        }
        
        static size_t& get_count()
        {
            return count;
        }
        
        /**********************************************************************/
        static void set_count(const size_t& newCount)
        {
            if (newCount<count)
            {
                throw std::runtime_error("StaticID error: YOU ARE TRYING TO SET THE COUNTER TO A LOWER VALUE THAN THE CURRENT ONE\n");
            }
            count =  newCount;
            count_used=false;
        }
        
        /**********************************************************************/
        static void set_increment(const size_t& newIncrement)
        {
            if (newIncrement<1)
            {
                throw std::runtime_error("StaticID error: newIncrement MUST BE >=1\n");
            }
            if(count_used)
            {
                count-=increment;
                count+=newIncrement;
            }
            increment = newIncrement;
        }
        
    };
    
    /* Static data members  *****************************/
    template<typename Derived>
    size_t StaticID<Derived>::increment = 1;
 
    template<typename Derived>
    size_t StaticID<Derived>::count = 0;
 
    template<typename Derived>
    bool StaticID<Derived>::count_used = false;
    
} // namespace gbLAB
#endif