NumVec_impl.hpp

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

Authors: Lexing Ying, Mathias Jacquelin 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.
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and/or other materials provided with the distribution.
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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
specific prior written permission.

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 */
#ifndef _PEXSI_NUMVEC_IMPL_HPP_
#define _PEXSI_NUMVEC_IMPL_HPP_


namespace  PEXSI{

  // Templated form of numerical vectors
  //
  // The main advantage of this portable NumVec structure is that it can
  // either own (owndata == true) or view (owndata == false) a piece of
  // data.

  template <class F> NumVec<F>::NumVec  () : m_(0), owndata_(true), data_(NULL), bufsize_(0)
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::NumVec");
#endif  // ifndef _RELEASE_
    m_ = 0;
#ifndef _RELEASE_
    PopCallStack();
#endif  // ifndef _RELEASE_
  }             // -----  end of method NumVec<F>::NumVec  ----- 


  template <class F> NumVec<F>::NumVec  ( Int m ) : m_(m), owndata_(true), data_(NULL), bufsize_(0)
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::NumVec");
#endif  // ifndef _RELEASE_

    this->allocate();

#ifndef _RELEASE_
    PopCallStack();
#endif  // ifndef _RELEASE_
  }             // -----  end of method NumVec<F>::NumVec  ----- 

  template <class F> NumVec<F>::NumVec  ( Int m, bool owndata, F* data ) : m_(m), owndata_(owndata), data_(NULL), bufsize_(0)
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::NumVec");
#endif  // ifndef _RELEASE_

    this->allocate(data);

#ifndef _RELEASE_
    PopCallStack();
#endif  // ifndef _RELEASE_
  }             // -----  end of method NumVec<F>::NumVec  ----- 

  template <class F> NumVec<F>::NumVec  ( const NumVec<F>& C ) : m_(C.m_), owndata_(C.owndata_), data_(NULL), bufsize_(0)
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::NumVec");
#endif  // ifndef _RELEASE_
    this->allocate(C.data_);
#ifndef _RELEASE_
    PopCallStack();
#endif  // ifndef _RELEASE_
  }             // -----  end of method NumVec<F>::NumVec  ----- 


  template < class F > NumVec<F>::~NumVec       (  )
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::~NumVec");
#endif  // ifndef _RELEASE_
    this->deallocate();
#ifndef _RELEASE_
    PopCallStack();
#endif  // ifndef _RELEASE_

  }             // -----  end of method NumVec<F>::~NumVec  ----- 


  template < class F > inline NumVec<F>& NumVec<F>::operator =  ( const NumVec& C  )
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::operator=");
#endif  // ifndef _RELEASE_
    this->deallocate();
    m_ = C.m_;
    owndata_ = C.owndata_;
    this->allocate(C.data_);
#ifndef _RELEASE_
    PopCallStack();
#endif  // ifndef _RELEASE_

    return *this;
  }             // -----  end of method NumVec<F>::operator=  ----- 


  template < class F > inline void NumVec<F>::Resize    ( const Int m )
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::Resize");
#endif  // ifndef _RELEASE_
    if( owndata_ == false ){
#ifdef USE_ABORT
      abort();
#endif
      throw std::logic_error("Vector being resized must own data.");
    }
    if(m > bufsize_) {
      this->deallocate();
      m_ = m;
      this->allocate();
    }
    else{
      m_ = m;
    }
#ifndef _RELEASE_
    PopCallStack();
#endif  // ifndef _RELEASE_
    return ;
  }             // -----  end of method NumVec<F>::Resize  ----- 

  template < class F > inline void NumVec<F>::Clear     ( )
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::Clear");
#endif  // ifndef _RELEASE_
    if( owndata_ == false ){
      data_ = NULL;
    }
    else{
      this->deallocate();
    }
#ifndef _RELEASE_
    PopCallStack();
#endif  // ifndef _RELEASE_
    return ;
  }             // -----  end of method NumVec<F>::Clear  ----- 



  template <class F> inline F& NumVec<F>::operator()    ( Int i )
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::operator()");
    if( i < 0 || i >= m_ ){
#ifdef USE_ABORT
      abort();
#endif
      throw std::logic_error( "Index is out of bound." );
    }
    PopCallStack();
#endif  // ifndef _RELEASE_
    return data_[i];

  }             // -----  end of method NumVec<F>::operator()  ----- 


  template <class F>
    inline const F&
    NumVec<F>::operator()       ( Int i ) const
    {
#ifndef _RELEASE_
      PushCallStack("NumVec<F>::operator()");
      if( i < 0 || i >= m_ ){
#ifdef USE_ABORT
        abort();
#endif
        throw std::logic_error( "Index is out of bound." );
      }
      PopCallStack();
#endif  // ifndef _RELEASE_
      return data_[i];

    }           // -----  end of method NumVec<F>::operator()  ----- 


  template <class F> inline F& NumVec<F>::operator[]    ( Int i )
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::operator[]");
    if( i < 0 || i >= m_ ){
#ifdef USE_ABORT
      abort();
#endif
      throw std::logic_error( "Index is out of bound." );
    }
    PopCallStack();
#endif  // ifndef _RELEASE_
    return data_[i];
  }             // -----  end of method NumVec<F>::operator[]  ----- 


  template <class F> inline const F& NumVec<F>::operator[]      ( Int i ) const
  {
#ifndef _RELEASE_
    PushCallStack("NumVec<F>::operator[]");
    if( i < 0 || i >= m_ ){
#ifdef USE_ABORT
      abort();
#endif
      throw std::logic_error( "Index is out of bound." );
    }
    PopCallStack();
#endif  // ifndef _RELEASE_
    return data_[i];

  }             // -----  end of method NumVec<F>::operator[]  ----- 

  template <class F> inline void NumVec<F>::allocate(F* data) {
    if(owndata_) {
      if(m_>0) { 
        data_ = new F[m_]; 
        if( data_ == NULL ) {
#ifdef USE_ABORT
          abort();
#endif
          throw std::runtime_error("Cannot allocate memory.");
        }
      } 
      else{
       data_=NULL;
      }
      if(data!=NULL){
        std::copy(data,data+m_,data_);
      }
    } 
    else {
      data_ = data;
    }
    bufsize_ = m_;
  }             // -----  end of method NumVec<F>::allocate  ----- 

  template <class F> inline void NumVec<F>::deallocate() {
    if(owndata_) {
      if(bufsize_>0) { delete[] data_; data_ = NULL; bufsize_=0; m_=0; }
    }
  }             // -----  end of method NumVec<F>::deallocate  ----- 




  template <class F> inline void SetValue( NumVec<F>& vec, F val )
  {
    std::fill(vec.Data(),vec.Data()+vec.m(),val);
  }

  template <class F> inline Real Energy( const NumVec<F>& vec )
  {
    Real sum = 0;
    for(Int i=0; i<vec.m(); i++){
      sum += std::abs(vec(i)*vec(i));
    }
    return sum;
  }  


} // namespace PEXSI

#endif // _PEXSI_NUMVEC_IMPL_HPP_