File: basis_func_pair_list.h

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/* Ergo, version 3.8, a program for linear scaling electronic structure
 * calculations.
 * Copyright (C) 2019 Elias Rudberg, Emanuel H. Rubensson, Pawel Salek,
 * and Anastasia Kruchinina.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Primary academic reference:
 * Ergo: An open-source program for linear-scaling electronic structure
 * calculations,
 * Elias Rudberg, Emanuel H. Rubensson, Pawel Salek, and Anastasia
 * Kruchinina,
 * SoftwareX 7, 107 (2018),
 * <http://dx.doi.org/10.1016/j.softx.2018.03.005>
 * 
 * For further information about Ergo, see <http://www.ergoscf.org>.
 */

/** @file basis_func_pair_list.h

    @brief Functions for setting up lists of non-negligible basis
    function pairs, for 2-electron integrals.

    @author: Elias Rudberg <em>responsible</em>
*/

#ifndef BASIS_FUNC_PAIR_LIST_HEADER
#define BASIS_FUNC_PAIR_LIST_HEADER

#include <vector>

#include "realtype.h"
#include "integral_info.h"
#include "basisinfo.h"

typedef struct
{
  int index_1;
  int index_2;
} basis_func_index_pair_struct;

int
get_basis_func_pair_list_2el(const BasisInfoStruct & basisInfo,
			     const IntegralInfo & integralInfo,
			     ergo_real threshold,
			     ergo_real maxDensityMatrixElement,
			     std::vector<basis_func_index_pair_struct>  & resultList);


#endif