numtns_decl.hpp

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/*
         Copyright (c) 2012 The Regents of the University of California,
         through Lawrence Berkeley National Laboratory.  

   Authors: Lexing Ying and Lin Lin
         
   This file is part of PEXSI. All rights reserved.

         Redistribution and use in source and binary forms, with or without
         modification, are permitted provided that the following conditions are met:

         (1) Redistributions of source code must retain the above copyright notice, this
         list of conditions and the following disclaimer.
         (2) Redistributions in binary form must reproduce the above copyright notice,
         this list of conditions and the following disclaimer in the documentation
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         (3) Neither the name of the University of California, Lawrence Berkeley
         National Laboratory, U.S. Dept. of Energy nor the names of its contributors may
         be used to endorse or promote products derived from this software without
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*/
#ifndef _NUMTNS_DECL_HPP_
#define _NUMTNS_DECL_HPP_

#include "environment.hpp"
#include "nummat_impl.hpp"

// TODO Move the things from decl to impl

namespace  PEXSI{

        template <class F>
                class NumTns
                {
                public:
                        Int m_; 

                        Int n_; 

                        Int p_;

                        bool owndata_;

                        F* data_;
                public:
                        NumTns(Int m=0, Int n=0, Int p=0): m_(m), n_(n), p_(p), owndata_(true) {
                                if(m_>0 && n_>0 && p_>0) { data_ = new F[m_*n_*p_]; if( data_ == NULL ) throw std::runtime_error("Cannot allocate memory."); } else data_=NULL;
                        }
                        NumTns(Int m, Int n, Int p, bool owndata, F* data): m_(m), n_(n), p_(p), owndata_(owndata) {
                                if(owndata_) {
                                        if(m_>0 && n_>0 && p_>0) { data_ = new F[m_*n_*p_]; if( data_ == NULL ) throw std::runtime_error("Cannot allocate memory."); } else data_=NULL;
                                        if(m_>0 && n_>0 && p_>0) { for(Int i=0; i<m_*n_*p_; i++) data_[i] = data[i]; }
                                } else {
                                        data_ = data;
                                }
                        }
                        NumTns(const NumTns& C): m_(C.m_), n_(C.n_), p_(C.p_), owndata_(C.owndata_) {
                                if(owndata_) {
                                        if(m_>0 && n_>0 && p_>0) { data_ = new F[m_*n_*p_]; if( data_ == NULL ) throw std::runtime_error("Cannot allocate memory."); } else data_=NULL;
                                        if(m_>0 && n_>0 && p_>0) { for(Int i=0; i<m_*n_*p_; i++) data_[i] = C.data_[i]; }
                                } else {
                                        data_ = C.data_;
                                }
                        }
                        ~NumTns() { 
                                if(owndata_) { 
                                        if(m_>0 && n_>0 && p_>0) { delete[] data_; data_ = NULL; } 
                                }
                        }
                        NumTns& operator=(const NumTns& C) {
                                if(owndata_) { 
                                        if(m_>0 && n_>0 && p_>0) { delete[] data_; data_ = NULL; } 
                                }
                                m_ = C.m_; n_=C.n_; p_=C.p_; owndata_=C.owndata_;
                                if(owndata_) {
                                        if(m_>0 && n_>0 && p_>0) { data_ = new F[m_*n_*p_]; if( data_ == NULL ) throw std::runtime_error("Cannot allocate memory."); } else data_=NULL;
                                        if(m_>0 && n_>0 && p_>0) { for(Int i=0; i<m_*n_*p_; i++) data_[i] = C.data_[i]; }
                                } else {
                                        data_ = C.data_;
                                }
                                return *this;
                        }
                        void Resize(Int m, Int n, Int p)  {
                                if( owndata_ == false ){
                                        throw std::logic_error("Tensor being resized must own data.");
                                }
                                if(m_!=m || n_!=n || p_!=p) {
                                        if(m_>0 && n_>0 && p_>0) { delete[] data_; data_ = NULL; } 
                                        m_ = m; n_ = n; p_=p;
                                        if(m_>0 && n_>0 && p_>0) { data_ = new F[m_*n_*p_]; if( data_ == NULL ) throw std::runtime_error("Cannot allocate memory."); } else data_=NULL;
                                }
                        }
                        const F& operator()(Int i, Int j, Int k) const  {
                                if( i < 0 || i >= m_ ||
                                                j < 0 || j >= n_ ||
                                                k < 0 || k >= p_ ) {
                                        throw std::logic_error( "Index is out of bound." );
                                }
                                return data_[i+j*m_+k*m_*n_];
                        }
                        F& operator()(Int i, Int j, Int k)  {
                                if( i < 0 || i >= m_ ||
                                                j < 0 || j >= n_ ||
                                                k < 0 || k >= p_ ) {
                                        throw std::logic_error( "Index is out of bound." );
                                }
                                return data_[i+j*m_+k*m_*n_];
                        }

                        //  Int isempty() const {return (m_==0) && (n_==0) && (p_==0);}

                        F* Data() const { return data_; }

                        F* MatData (Int j) const {
                                if( j < 0 || j >= p_ ) {
                                        throw std::logic_error( "Index is out of bound." );
                                }
                                return &(data_[j*m_*n_]);
                        };

                        F* VecData (Int j, Int k) const {
                                if( j < 0 || j >= n_ ||
                                                k < 0 || k >= p_ ) {
                                        throw std::logic_error( "Index is out of bound." );
                                }

                                return &(data_[k*m_*n_+j*m_]);
                        };

                        Int m() const { return m_; }
                        Int n() const { return n_; }
                        Int p() const { return p_; }

                };


        typedef NumTns<bool>       BolNumTns;
        typedef NumTns<Int>        IntNumTns;
        typedef NumTns<Real>       DblNumTns;
        typedef NumTns<Complex>    CpxNumTns;

        // *********************************************************************
        // Utility functions
        // *********************************************************************
        template <class F> inline void SetValue(NumTns<F>& T, F val);

        template <class F> inline Real Energy(const NumTns<F>& T);

} // namespace PEXSI

#endif // _NUMTNS_DECL_HPP_