Index.hpp

#ifndef vector_Index_HPP
#define vector_Index_HPP "Created 21.05.2006 12:12:12 by werner"
 
#include <sys/types.h>
#include <stdint.h>
 
namespace Fiber
{
 
template <int PtrSize>  struct  IndexTypeConfig;
 
template <>  struct IndexTypeConfig<8> { typedef uint64_t index_t; };
template <>  struct IndexTypeConfig<4> { typedef uint32_t index_t; };
 
typedef IndexTypeConfig<sizeof(void*)>::index_t index_t;
 
constexpr inline int log2(index_t arg)
{
int     loop = 0;
        for (loop = 0; arg != 0; loop++, arg >>= 1)
                ;
 
        return loop;
}
 
constexpr inline index_t RoundUpToNextHighestPowerOf2(index_t v)
{
        v--;
        v |= v >> 1;
        v |= v >> 2;
        v |= v >> 4;
        v |= v >> 8;
        v |= v >> 16;
        v++;
        return v;
}
 
constexpr inline index_t clamp(index_t value, index_t range)
{
        if (value>range) return range;
        return value;
}
 
constexpr inline index_t clamp_m1(index_t value, index_t range)
{
        if (value>=range) return range-1;
        return value;
}
 
constexpr inline index_t clamp(index_t low_range, index_t value, index_t high_range)
{
        if (value < low_range ) return low_range;
        if (value > high_range) return high_range;
 
        return  value;
}
 
} /* namespace Fiber */
 
#endif /* vector_Index_HPP */