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//
// Copyright (C) 2003-2006 Rational Discovery LLC
//
// @@ All Rights Reserved @@
// This file is part of the RDKit.
// The contents are covered by the terms of the BSD license
// which is included in the file license.txt, found at the root
// of the RDKit source tree.
//
#include <RDGeneral/export.h>
#ifndef _RD_DISTPICKER_H
#define _RD_DISTPICKER_H
#include <RDGeneral/types.h>
namespace RDPickers {
/*! \brief function to lookup distance from 1D lower triangular distance matrix
*
*
* \param distMat - a pointer to a 1D lower triangular distance matrix \n
* \param i - row index \n
* \param j - column index \n
*
* RETURNS:
*
* if (i == j) : 0.0
* if (i > j) : distMat[i*(i-1)/2 + j]
* if (j < i) : distMat[j*(j-1)/2 + i]
*/
RDKIT_SIMDIVPICKERS_EXPORT double getDistFromLTM(const double *distMat,
unsigned int i,
unsigned int j);
/*! \brief Abstract base class to do perform item picking (typically molecules)
*using a
* distance matrix
*
* This class should never be instantiated by itself. One of the child classes
*need to be
* used. The picking algorithm itself is missing here and only the child
*classes implement that
* This class contains a pointer to a distance matrix, but it is not
*responsible for cleaning it up
*/
class RDKIT_SIMDIVPICKERS_EXPORT DistPicker {
public:
/*! \brief Default constructor
*
*/
DistPicker() {}
virtual ~DistPicker() {}
/*! \brief this is a virtual function specific to the type of algorihtm used
*
* The child classes need to implement this function
*
* ARGUMENTS:
*
* \param distMat - distance matrix - a vector of double. It is assumed
*that only the
* lower triangle elements of the matrix are supplied in a 1D
*array
* \param poolSize - the size of the pool to pick the items from. It is
*assumed that the
* distance matrix above contains the right number of elements;
*i.e.
* poolSize*(poolSize-1)
* \param pickSize - the number items to pick from pool (<= poolSize)
*
* \return a vector with indices of the picked items.
*/
virtual RDKit::INT_VECT pick(const double *distMat, unsigned int poolSize,
unsigned int pickSize) const = 0;
};
namespace {
class distmatFunctor {
public:
distmatFunctor(const double *distMat) : dp_distMat(distMat) {}
double operator()(unsigned int i, unsigned int j) {
return getDistFromLTM(this->dp_distMat, i, j);
}
private:
const double *dp_distMat;
};
} // namespace
}; // namespace RDPickers
#endif
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