GlobalSim::BDT Namespace Reference

Classes
struct	BDT
class	OpAdd
struct	Tree

Functions
constexpr int	floorlog2 (int x)
constexpr int	pow2 (int x)
template<class T, int N, class Op>
T	reduce (const T *x, Op op)
constexpr int	fn_classes (int n_classes)

Function Documentation

floorlog2()

int GlobalSim::BDT::floorlog2 ( int x )

constexpr

Definition at line 22 of file Trigger/TrigT1/Global/GlobalSimulation/src/FirstChain/Egamma1BDT/BDT.h.

{ return (x < 2) ? 0 : 1 + floorlog2(x / 2); }

fn_classes()

int GlobalSim::BDT::fn_classes ( int n_classes )

constexpr

Definition at line 44 of file Trigger/TrigT1/Global/GlobalSimulation/src/FirstChain/Egamma1BDT/BDT.h.

                                           {
      return n_classes == 2 ? 1 : n_classes;
    }

pow2()

int GlobalSim::BDT::pow2 ( int x )

constexpr

Definition at line 24 of file Trigger/TrigT1/Global/GlobalSimulation/src/FirstChain/Egamma1BDT/BDT.h.

{ return x == 0 ? 1 : 2 * pow2(x - 1); }

reduce()

template<class T, int N, class Op>

T GlobalSim::BDT::reduce	(	const T *	x,
		Op	op )

Definition at line 26 of file Trigger/TrigT1/Global/GlobalSimulation/src/FirstChain/Egamma1BDT/BDT.h.

                                                                    {
      static constexpr int leftN = pow2(floorlog2(N - 1)) > 0 ? pow2(floorlog2(N - 1)) : 0;
      static constexpr int rightN = N - leftN > 0 ? N - leftN : 0;
      if (N == 1) {
    return x[0];
      }
      if (N == 2) {
    return op(x[0], x[1]);
      }
      return op(reduce<T, leftN, Op>(x, op), reduce<T, rightN, Op>(x + leftN, op));
    }