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# int2e.h

    00001 //
    00002 // int2e.h
    00003 //
    00004 // Copyright (C) 2001 Edward Valeev
    00005 //
    00006 // Author: Edward Valeev <edward.valeev@chemistry.gatech.edu>
    00007 // Maintainer: EV
    00008 //
    00009 // This file is part of the SC Toolkit.
    00010 //
    00011 // The SC Toolkit is free software; you can redistribute it and/or modify
    00012 // it under the terms of the GNU Library General Public License as published by
    00013 // the Free Software Foundation; either version 2, or (at your option)
    00014 // any later version.
    00015 //
    00016 // The SC Toolkit is distributed in the hope that it will be useful,
    00017 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00019 // GNU Library General Public License for more details.
    00020 //
    00021 // You should have received a copy of the GNU Library General Public License
    00022 // along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
    00023 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
    00024 //
    00025 // The U.S. Government is granted a limited license as per AL 91-7.
    00026 //
    00027
    00028 #ifdef __GNUG__
    00029 #pragma interface
    00030 #endif
    00031
    00032 #ifndef _chemistry_qc_cints_int2e_h
    00033 #define _chemistry_qc_cints_int2e_h
    00034
    00035 #include <limits.h>
    00036
    00037 #include <util/ref/ref.h>
    00038 #include <chemistry/qc/basis/basis.h>
    00039 #include <chemistry/qc/basis/tbint.h>
    00040
    00041 namespace sc {
    00042
    00043 class Integral;
    00044
    00048 class Int2eCints: public RefCount {
    00049   protected:
    00050     Integral *integral_;
    00051
    00052     Ref<GaussianBasisSet> bs1_;
    00053     Ref<GaussianBasisSet> bs2_;
    00054     Ref<GaussianBasisSet> bs3_;
    00055     Ref<GaussianBasisSet> bs4_;
    00056
    00057     Ref<MessageGrp> grp_;
    00058
    00059     GaussianShell *int_shell1_;
    00060     GaussianShell *int_shell2_;
    00061     GaussianShell *int_shell3_;
    00062     GaussianShell *int_shell4_;
    00063
    00064     // Whether shells can be permuted
    00065     int permute_;
    00066     // Whether redundant integrals are needed or only unique ones
    00067     int redundant_;
    00068
    00069     /*--- Storage related stuff ---*/
    00070     // Available storage
    00071     size_t storage_;
    00072     // Storage currently used
    00073     size_t storage_used_;
    00074     // Checks if too much storage is used
    00075     void check_storage_() const;
    00076     // Reports minimum "significant" storage needed to initialize the Int2e base
    00077     static size_t storage_required_(const Ref<GaussianBasisSet>& b1,
    00078                                     const Ref<GaussianBasisSet>& b2 = 0,
    00079                                     const Ref<GaussianBasisSet>& b3 = 0,
    00080                                     const Ref<GaussianBasisSet>& b4 = 0);
    00081
    00082     /*--- Scratch ---*/
    00083     double *tformbuf_;    // stores one partially transformed contraction quartet
    00084
    00085     /*--- helper functions ---*/
    00086     // cart.->sph.harm. transform functions
    00087     void transform_contrquartets_(double *,double *);
    00088     // sort from by-contraction-quartet to shell-quartet order
    00089     void sort_contrquartets_to_shellquartet_(double *,double *);
    00090     // permute perm_ints_ into target_int_buf_
    00091     void permute_target_(double *, double *, int, int, int);
    00092     void permute_1234_to_1243_(double *, double *);
    00093     void permute_1234_to_2134_(double *, double *);
    00094     void permute_1234_to_2143_(double *, double *);
    00095     void permute_1234_to_3412_(double *, double *);
    00096     void permute_1234_to_3421_(double *, double *);
    00097     void permute_1234_to_4312_(double *, double *);
    00098     void permute_1234_to_4321_(double *, double *);
    00099     // retrieve nonredundant integrals
    00100     void get_nonredundant_ints_(double *, double *, int, int, int);
    00101
    00102   public:
    00103     Int2eCints(Integral *,
    00104                const Ref<GaussianBasisSet>&,
    00105                const Ref<GaussianBasisSet>&,
    00106                const Ref<GaussianBasisSet>&,
    00107                const Ref<GaussianBasisSet>&,
    00108                size_t storage);
    00109     ~Int2eCints();
    00110
    00112     void init_storage(size_t);
    00114     void done_storage();
    00116     size_t storage_used() const { return storage_used_; }
    00117
    00119     int redundant() const { return redundant_; }
    00121     void set_redundant(int flag) { redundant_ = flag; }
    00122
    00124     int permute() const { return permute_; }
    00126     void set_permute(int flag) { permute_ = flag; }
    00127
    00129     virtual void compute_quartet(int *, int*, int*, int*) =0;
    00131     virtual double *buffer(TwoBodyInt::tbint_type = TwoBodyInt::eri) const =0;
    00132
    00133     Ref<GaussianBasisSet> basis()
    00134     {
    00135       if (bs1_==bs2_ && bs1_ == bs3_ && bs1_ == bs4_) return bs1_;
    00136       return 0;
    00137     }
    00138     Ref<GaussianBasisSet> basis1() { return bs1_; }
    00139     Ref<GaussianBasisSet> basis2() { return bs2_; }
    00140     Ref<GaussianBasisSet> basis3() { return bs3_; }
    00141     Ref<GaussianBasisSet> basis4() { return bs4_; }
    00142
    00143 };
    00144
    00145 }
    00146
    00147 #endif
    00148
    00149 // Local Variables:
    00150 // mode: c++
    00151 // c-file-style: "CLJ"
    00152 // End: