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.

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modification, are permitted provided that the following conditions are met:

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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)
{
  m_ = 0;
}               // -----  end of method NumVec<F>::NumVec  ----- 


template <class F> NumVec<F>::NumVec    ( Int m ) : m_(m), owndata_(true), data_(NULL), bufsize_(0)
{

  this->allocate();

}               // -----  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)
{

  this->allocate(data);

}               // -----  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)
{
  this->allocate(C.data_);
}               // -----  end of method NumVec<F>::NumVec  ----- 


template < class F > NumVec<F>::~NumVec (  )
{
  this->deallocate();

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


template < class F > inline NumVec<F>& NumVec<F>::operator =    ( const NumVec& C  )
{
  this->deallocate();
  m_ = C.m_;
  owndata_ = C.owndata_;
  this->allocate(C.data_);

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


template < class F > inline void NumVec<F>::Resize      ( const Int m )
{
  if( owndata_ == false ){
    ErrorHandling("Vector being resized must own data.");
  }
  if(m > bufsize_) {
    this->deallocate();
    m_ = m;
    this->allocate();
  }
  else{
    m_ = m;
  }
  return ;
}               // -----  end of method NumVec<F>::Resize  ----- 

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



template <class F> inline F& NumVec<F>::operator()      ( Int i )
{
  if( i < 0 || i >= m_ ){
    ErrorHandling( "Index is out of bound." );
  }
  return data_[i];

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


template <class F>
inline const F&
NumVec<F>::operator()   ( Int i ) const
{
  if( i < 0 || i >= m_ ){
    ErrorHandling( "Index is out of bound." );
  }
  return data_[i];

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


template <class F> inline F& NumVec<F>::operator[]      ( Int i )
{
  if( i < 0 || i >= m_ ){
    ErrorHandling( "Index is out of bound." );
  }
  return data_[i];
}               // -----  end of method NumVec<F>::operator[]  ----- 


template <class F> inline const F& NumVec<F>::operator[]        ( Int i ) const
{
  if( i < 0 || i >= m_ ){
    ErrorHandling( "Index is out of bound." );
  }
  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 ) {
        ErrorHandling("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_