eigen_herm.hpp

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/*
 * $Id: eigen_herm.hpp 125 2012-02-19 18:18:25Z jdl3 $
 * Copyright (C) 2010, 2011, 2012 John D Lamb
 * Enum copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Gerard Jungman, Brian Gough
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
#ifndef CCGSL_EIGEN_HERM_HPP
#define CCGSL_EIGEN_HERM_HPP
 
#include<gsl/gsl_eigen.h>
#include<new>
#include<iterator>
 
#include"vector.hpp"
#include"matrix_complex.hpp"
 
namespace gsl {
  namespace eigen {
    class herm_workspace {
    public:
      herm_workspace(){
    ccgsl_pointer = 0;
    count = 0; // initially nullptr will do
      }
      // Refines random access container
      // Refines assignable
      explicit herm_workspace( size_t const n ){
    ccgsl_pointer = gsl_eigen_herm_alloc( n );
    // just plausibly we could allocate herm_workspace but not count
    try { count = new size_t; } catch( std::bad_alloc& e ){
      // try to tidy up before rethrowing
      gsl_eigen_herm_free( ccgsl_pointer );
      throw e;
    }
    *count = 1; // initially there is just one reference to ccgsl_pointer
      }
      explicit herm_workspace( gsl_eigen_herm_workspace* v ){
    ccgsl_pointer = v;
    // just plausibly we could fail to allocate count: no further action needed.
    count = new size_t;
    *count = 1; // initially there is just one reference to ccgsl_pointer
      }
      // copy constructor
      herm_workspace( herm_workspace const& v ){ ccgsl_pointer = v.ccgsl_pointer;
    count = v.count; if( count != 0 ) ++*count; }
      // assignment operator
      herm_workspace& operator=( herm_workspace const& v ){
    // first, possibly delete anything pointed to by this
    if( count == 0 or --*count == 0 ){
      if( ccgsl_pointer != 0 ) gsl_eigen_herm_free( ccgsl_pointer );
      delete count;
    } // Then copy
    ccgsl_pointer = v.ccgsl_pointer; count = v.count; if( count != 0 ) ++*count; return *this;
      }
      // destructor
      ~herm_workspace(){
    if( count == 0 or --*count == 0 ){
      // could have allocated null pointer
      if( ccgsl_pointer != 0 ) gsl_eigen_herm_free( ccgsl_pointer );
      delete count;
    }
      }
#ifdef __GXX_EXPERIMENTAL_CXX0X__
      herm_workspace( herm_workspace&& v ) : ccgsl_pointer( v.ccgsl_pointer ), count( nullptr ){
    std::swap( count, v.count );
    v.ccgsl_pointer = nullptr;
      }
      herm_workspace& operator=( herm_workspace&& v ){
    herm_workspace( std::move( v ) ).swap( *this );
    return *this;
      }
#endif
      // Refines equality comparable
      // == operator
      bool operator==( herm_workspace const& v ) const { return ccgsl_pointer == v.ccgsl_pointer; }
      // != operator
      bool operator!=( herm_workspace const& v ) const { return not operator==( v ); }
      // Refines forward container
      // Refines less than comparable
      // operator<
      bool operator<( herm_workspace const& v ) const { return ccgsl_pointer < v.ccgsl_pointer; }
      // operator>
      bool operator>( herm_workspace const& v ) const { return ccgsl_pointer > v.ccgsl_pointer; }
      // operator<=
      bool operator<=( herm_workspace const& v ) const { return ccgsl_pointer <= v.ccgsl_pointer; }
      // operator>=
      bool operator>=( herm_workspace const& v ) const { return ccgsl_pointer >= v.ccgsl_pointer; }
      bool empty() const { return ccgsl_pointer == 0; }
      // swap() --- should work even if sizes don't match
      void swap( herm_workspace& v ){
    std::swap( ccgsl_pointer, v.ccgsl_pointer );
    std::swap( count, v.count );
      }
    size_t size() const { return ccgsl_pointer == 0 ? 0 : ccgsl_pointer->size; }
    private:
      gsl_eigen_herm_workspace* ccgsl_pointer;
      size_t* count;
    public:
      // shared reference functions
      gsl_eigen_herm_workspace* get() const { return ccgsl_pointer; }
      bool unique() const { return count != 0 and *count == 1; }
      size_t use_count() const { return count == 0 ? 0 : *count; }
#ifdef __GXX_EXPERIMENTAL_CXX0X__
      explicit
#endif
      operator bool() const { return ccgsl_pointer != 0; }
    };
    inline int herm( gsl::matrix_complex& A, gsl::vector& eval, herm_workspace& w ){
      return gsl_eigen_herm( A.get(), eval.get(), w.get() ); }
    class hermv_workspace {
    public:
      hermv_workspace(){
    ccgsl_pointer = 0;
    count = 0; // initially nullptr will do
      }
      // Refines random access container
      // Refines assignable
      explicit hermv_workspace( size_t const n ){
    ccgsl_pointer = gsl_eigen_hermv_alloc( n );
    // just plausibly we could allocate hermv_workspace but not count
    try { count = new size_t; } catch( std::bad_alloc& e ){
      // try to tidy up before rethrowing
      gsl_eigen_hermv_free( ccgsl_pointer );
      throw e;
    }
    *count = 1; // initially there is just one reference to ccgsl_pointer
      }
      explicit hermv_workspace( gsl_eigen_hermv_workspace* v ){
    ccgsl_pointer = v;
    // just plausibly we could fail to allocate count: no further action needed.
    count = new size_t;
    *count = 1; // initially there is just one reference to ccgsl_pointer
      }
      // copy constructor
      hermv_workspace( hermv_workspace const& v ){ ccgsl_pointer = v.ccgsl_pointer;
    count = v.count; if( count != 0 ) ++*count; }
      // assignment operator
      hermv_workspace& operator=( hermv_workspace const& v ){
    // first, possibly delete anything pointed to by this
    if( count == 0 or --*count == 0 ){
      if( ccgsl_pointer != 0 ) gsl_eigen_hermv_free( ccgsl_pointer );
      delete count;
    } // Then copy
    ccgsl_pointer = v.ccgsl_pointer; count = v.count; if( count != 0 ) ++*count; return *this;
      }
      // destructor
      ~hermv_workspace(){
    if( count == 0 or --*count == 0 ){
      // could have allocated null pointer
      if( ccgsl_pointer != 0 ) gsl_eigen_hermv_free( ccgsl_pointer );
      delete count;
    }
      }
#ifdef __GXX_EXPERIMENTAL_CXX0X__
      hermv_workspace( hermv_workspace&& v ) : ccgsl_pointer( v.ccgsl_pointer ), count( nullptr ){
    std::swap( count, v.count );
    v.ccgsl_pointer = nullptr;
      }
      hermv_workspace& operator=( hermv_workspace&& v ){
    hermv_workspace( std::move( v ) ).swap( *this );
    return *this;
      }
#endif
      // Refines equality comparable
      // == operator
      bool operator==( hermv_workspace const& v ) const { return ccgsl_pointer == v.ccgsl_pointer; }
      // != operator
      bool operator!=( hermv_workspace const& v ) const { return not operator==( v ); }
      // Refines forward container
      // Refines less than comparable
      // operator<
      bool operator<( hermv_workspace const& v ) const { return ccgsl_pointer < v.ccgsl_pointer; }
      // operator>
      bool operator>( hermv_workspace const& v ) const { return ccgsl_pointer > v.ccgsl_pointer; }
      // operator<=
      bool operator<=( hermv_workspace const& v ) const { return ccgsl_pointer <= v.ccgsl_pointer; }
      // operator>=
      bool operator>=( hermv_workspace const& v ) const { return ccgsl_pointer >= v.ccgsl_pointer; }
      bool empty() const { return ccgsl_pointer == 0; }
      // swap() --- should work even if sizes don't match
      void swap( hermv_workspace& v ){
    std::swap( ccgsl_pointer, v.ccgsl_pointer );
    std::swap( count, v.count );
      }
    size_t size() const { return ccgsl_pointer == 0 ? 0 : ccgsl_pointer->size; }
    private:
      gsl_eigen_hermv_workspace* ccgsl_pointer;
      size_t* count;
    public:
      // shared reference functions
      gsl_eigen_hermv_workspace* get() const { return ccgsl_pointer; }
      bool unique() const { return count != 0 and *count == 1; }
      size_t use_count() const { return count == 0 ? 0 : *count; }
#ifdef __GXX_EXPERIMENTAL_CXX0X__
      explicit
#endif
      operator bool() const { return ccgsl_pointer != 0; }
    };
    inline int hermv( gsl::matrix_complex& A, gsl::vector& eval,
           gsl::matrix_complex& evec, hermv_workspace& w ){
      return gsl_eigen_hermv( A.get(), eval.get(), evec.get(), w.get() ); }
  }
}
 
#endif