RootCore Packages: /cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/CxxUtils/CxxUtils/ones.h Source File

00001 // This file's extension implies that it's C, but it's really -*- C++ -*-.
00002 // $Id$
00011 #ifndef CXXUTILS_ONES_H
00012 #define CXXUTILS_ONES_H
00013 
00014 
00015 namespace CxxUtils {
00016 
00017 
00021 template <class T>
00022 inline
00023 T ones (unsigned int n)
00024 {
00025   if (n >= sizeof(T) * 8)
00026     return ~static_cast<T>(0);
00027   return (static_cast<T>(1) << n) - 1;
00028 }
00029 
00030 
00031 } // namespace CxxUtils
00032 
00033 
00034 #endif // not CXXUTILS_ONES_H