/usr/include/ThePEG/ACDC/ACDCTraits.h is in libthepeg-dev 1.8.0-3build1.
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//
// ACDCTraits.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2011 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 {
/**
* ACDCTraitsType is an empty non-polymorphic base class for all
* traits classes in ACDCGenerator.
*/
struct ACDCTraitsType {};
/**
* ACDCFncTraits defines the interface to functions to be sampled by
* ACDCGen. It only defines one function which defines how the
* functions are called. If the default implementation is not
* suitable, ACDCFncTraits may be specialized for a function class
* implementing a function with the same signature.
*/
template <typename FncPtr>
struct ACDCFncTraits: public ACDCTraitsType {
/**
* Call a function to be sampled by ACDCGen.
* @return <code>(*f)(x)</code>.
*/
static inline double value(const FncPtr & f, const DVector & x) {
return (*f)(x);
}
};
/**
* ACDCRandomTraits defines the interface to random number generator
* objects to be used by ACDCGen. If this default implementation is
* not suitable, ACDCRandomTraits may be specialized for any class as
* long as functions with the same signature are present.
*/
template <typename Rnd>
struct ACDCRandomTraits: public ACDCTraitsType {
/**
* Return a flat random number in the interval ]0,1[.
*/
static inline double rnd(Rnd * r) { return r->flat(); }
/**
* Return a flat random number in the interval ]\a xl,\a xu[.
*/
static inline double rnd(Rnd * r, double xl, double xu) {
return xl + (xu - xl)*rnd(r);
}
/**
* Generate a set of random numbers.
* @param r the random generator.
* @param l an input iterator giving the lower limit of the interval
* of the first requested random number.
* @param lend an input iterator marking the end of the range of
* requested random numbers.
* @param u an input iterator giving the upper limit of the interval
* of the first requested random number.
* @param res the ouput iterator used to output the random numbers.
*/
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);
}
/**
* Generate \a D random numbers. The numbers are put into the
* OutputIterator \a res.
*/
template <typename OutputIterator>
static inline void rnd(Rnd * r, int D, OutputIterator res) {
for ( int d = 0; d < D; ++d ) *res++ = rnd(r);
}
/**
* Return true with probability \a x.
*/
static inline bool rndBool(Rnd * r, double x) { return rnd(r) < x; }
/**
* Return true with probability \a x(\a x + \a y).
*/
static inline bool rndBool(Rnd * r, double x, double y) {
return rndBool(r, x/(x + y)); }
/**
* Return a random integer in the interval [0,\a x[.
*/
static inline long rndInt(Rnd * r, long x) {
return long(rnd(r, 0.0, double(x)));
}
};
}
#endif
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