Calibration/facilities/include/facilities/bitmanip.h

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// $Id: bitmanip.h,v 1.1.1.1 2005/10/17 06:11:40 maqm Exp $
// bitmanip.h
// Author:  Sawyer Gillespie
//          University of Washington, Physics Department
//          March 1999
//          hgillesp@u.washington.edu
//
//  Defines several inline routines to provide access to various
//  bit-patterns within various words. The functions byte_N return
//  the Nth byte of a given word counting from low to high bits.
 
#ifndef _bitmanip_H__
#define _bitmanip_H__
 
#ifdef _MSC_VER
#  pragma once
#endif
 
namespace bitmanip {
 
  // template functions for getting/setting four bit words
  // i is the word #
  // v is the value
  // s it the new value
 
  template <class _T> inline short int word( short i, const _T& v ) {
    short shft = i * 4;
    _T    mask = 0x000F << shft;
    return ( v & mask ) >> shft;
  }
 
  template <class _T> void set_word( short i, _T& v, const _T& s ) {
    short shft = i * 4;
    _T    mask = 0x000F << shft;
    v          = ( ( v & ~mask ) | ( ( s << shft ) & mask ) );
  }
 
} // namespace bitmanip
 
#endif