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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         this list of conditions and the following disclaimer in the documentation
         and/or other materials provided with the distribution.
         (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 _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    ( Int m ) : m_(m), owndata_(true)
{
#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)
{
#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_)
{
#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 ){
                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 F& NumVec<F>::operator()      ( Int i )
{
#ifndef _RELEASE_
        PushCallStack("NumVec<F>::operator()");
        if( i < 0 || i >= m_ ){
                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_ ){
                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_ ){
                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_ ){
                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 ) 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; }
  }
}               // -----  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_