ACDCTraits.h

// -*- C++ -*-
//
// ACDCTraits.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2007 Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ACDCTraits_H
#define ACDCTraits_H

namespace ACDCGenerator {

struct ACDCTraitsType {};

template <typename FncPtr>
struct ACDCFncTraits: public ACDCTraitsType {

  static inline double value(const FncPtr & f, const DVector & x) {
    return (*f)(x);
  }

};

template <typename Rnd>
struct ACDCRandomTraits: public ACDCTraitsType {

  static inline double rnd(Rnd * r) { return r->flat(); }

  static inline double rnd(Rnd * r, double xl, double xu) {
    return xl + (xu - xl)*rnd(r);
  }

  template <typename InputIterator, typename OutputIterator>
  static inline void rnd(Rnd * r, InputIterator l, InputIterator lend,
                           InputIterator u, OutputIterator res) {
    for ( ; l != lend; ++l ) *res++ = *l + (*u++ - *l)*rnd(r);
  }

  template <typename OutputIterator>
  static inline void rnd(Rnd * r, int D, OutputIterator res) {
    for ( int d = 0; d < D; ++d ) *res++ = rnd(r);
  }

  static inline bool rndBool(Rnd * r, double x) { return rnd(r) < x; }

  static inline bool rndBool(Rnd * r, double x, double y) {
    return rndBool(r, x/(x + y)); }

  static inline long rndInt(Rnd * r, long x) {
    return long(rnd(r, 0.0, double(x)));
  }

};

}

#endif

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