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BoxLayout Class Reference

A not-necessarily-disjoint collective of boxes. More...

#include <BoxLayout.H>

Inheritance diagram for BoxLayout:

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Collaboration diagram for BoxLayout:

Collaboration graph
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List of all members.

Modification functions

DataIndex addBox (const Box &box, int procID)
virtual void close ()
virtual void deepCopy (const BoxLayout &a_source)
bool coarsenable (int refRatio) const
void setProcID (const LayoutIndex &a_index, unsigned int a_procID)
void sort ()
void aliasAddBox (const Box &box)
void aliasClose ()
void coarsen (BoxLayout &output, const BoxLayout &input, int refinement)
void refine (BoxLayout &output, const BoxLayout &input, int refinement)

Public Member Functions

Constructors, destructors, assignments, defines
 BoxLayout ()
 BoxLayout (const Vector< Box > &a_boxes, const Vector< int > &a_procIDs)
virtual ~BoxLayout ()
BoxLayoutoperator= (const BoxLayout &a_rhs)
virtual void define (const Vector< Box > &a_boxes, const Vector< int > &a_procIDs)
Accessors
const Boxoperator[] (const LayoutIndex &it) const
Boxoperator[] (const LayoutIndex &it)
Box get (const LayoutIndex &it) const
Box get (const LayoutIterator &it) const
Box get (const DataIterator &it) const
unsigned int procID (const LayoutIndex &a_index) const
int numBoxes (const int procID) const
unsigned int size () const
unsigned int index (const LayoutIndex &index) const
Checks
bool operator== (const BoxLayout &rhs) const
bool eq (const BoxLayout &rhs) const
bool isClosed () const
bool isSorted () const
bool check (const LayoutIndex &index) const
Iterators
DataIterator dataIterator () const
 Parallel iterator.
LayoutIterator layoutIterator () const
 Iterator that processes through ALL the boxes in a BoxLayout.
I/O functions
void print () const
void p () const

Protected Member Functions

void setIndexVector ()

Protected Attributes

RefCountedPtr< Vector< Entry > > m_boxes
RefCountedPtr< Vector< unsigned
int > > 
m_index
RefCountedPtr< int > m_layout
RefCountedPtr< bool > m_closed
RefCountedPtr< DataIteratorm_dataIterator

Friends

class LayoutIterator
class DataIterator

Detailed Description

A not-necessarily-disjoint collective of boxes.

A BoxLayout is a collection of Box objects that are assigned to process numbers. Each box is associated with only one process. Processes are numbered from 0 to n-1 (for a job with n processes).

A BoxLayout can be either open or closed.

Open BoxLayout:

Closed BoxLayout:

Ref-counting

BoxLayout is an explicitly ref-counted object.

Assignment and copy are compiler-generated. They increment the refcount on the contained data members. They perform shallow, ref-counted operations.

Refcounting is a process whereby multiple instantiations make use of a single implementation of that object and keep a tally of how many instantiations are sharing. Thus:

  BoxLayout b1(boxes, procIDs);

            b1  ----> refcount = 1
                ---->  m_boxes
                ---->  m_processors

  BoxLayout b2(b1)

            b1  ----> refcount = 2  <---- b2
                ---->  m_boxes      <----
                ---->  m_processors <----

  BoxLayout b3;
  b3 = b2;

            b1  ----> refcount = 3  <---- b2
                ---->  m_boxes      <----
                ---->  m_processors <----
                        ^^^
                        |||
                         b3
  


Constructor & Destructor Documentation

BoxLayout::BoxLayout  ) 
 

Construct BoxLayout with no boxes.

BoxLayout::BoxLayout const Vector< Box > &  a_boxes,
const Vector< int > &  a_procIDs
 

Construct from a Vector of Boxes and a Vector of processor assignments. On exit, the BoxLayout will be closed.

virtual BoxLayout::~BoxLayout  )  [virtual]
 

Ref-counted destruction. Once the last reference to the implementation of this class is destroyed, the data members are cleaned up


Member Function Documentation

DataIndex BoxLayout::addBox const Box box,
int  procID
 

Add a box to this BoxLayout. Takes the processor assignment. The input box is copied. BoxLayout must be "open" for this operation, or else a runtime error will occur.

void BoxLayout::aliasAddBox const Box box  ) 
 

Not a user function, used in Chombo interface to AMRData.H interoperability tools.

void BoxLayout::aliasClose  ) 
 

Not a user function, used in Chombo interface to AMRData.H interoperability tools.

bool BoxLayout::check const LayoutIndex index  )  const [inline]
 

not a user function

virtual void BoxLayout::close  )  [virtual]
 

Mark this BoxLayout as complete and unchangeable.

Reimplemented in DisjointBoxLayout.

bool BoxLayout::coarsenable int  refRatio  )  const
 

returns true iff:

  • every Box in the BoxLayout can be coarsened by refRatio and return back to the original Box when refined by refRatio.
  • refRatio must be a positive non-zero integer.

DataIterator BoxLayout::dataIterator  )  const
 

Parallel iterator.

Parallel iterator.

Returns DataIndex object that corresponds to boxes on the local processor only.

virtual void BoxLayout::deepCopy const BoxLayout a_source  )  [virtual]
 

Actual deep copy operation. New object created with copied data. This object disassociates itself with original implementation safely. This object now is considered 'open' and can be non-const modified. There is no assurance that the order in which this BoxLayout is indexed corresponds to the indexing of a_source.

       BoxLayout b1(boxes, procIDs);

            b1  ----> refcount = 1
                ---->  m_boxes
                ---->  m_processors

       BoxLayout b2(b1)

            b1  ----> refcount = 2  <---- b2
                ---->  m_boxes      <----
                ---->  m_processors <----

       BoxLayout b3;
       b3.deepCopy(b2);
            b1  ----> refcount = 2  <---- b2  b3 ----> refcount = 1
                ---->  m_boxes      <----        ---->  m_boxes
                ---->  m_processors <----        ---->  m_processors

Reimplemented in DisjointBoxLayout.

virtual void BoxLayout::define const Vector< Box > &  a_boxes,
const Vector< int > &  a_procIDs
[virtual]
 

Define this BoxLayout from a Vector of Boxes and a Vector of processor assignments. Any pre-existing layout will be lost (ref-count dropped by one). The processor assignment Vector must be the same length as the Box Vector. On exit, the BoxLayout will be closed.

Reimplemented in DisjointBoxLayout.

bool BoxLayout::eq const BoxLayout rhs  )  const [inline]
 

Refcounted pointer check. Return true if these two objects share the same implementation.

Box BoxLayout::get const DataIterator it  )  const
 

Get box indexed by it.

Box BoxLayout::get const LayoutIterator it  )  const
 

Get box indexed by it.

Box BoxLayout::get const LayoutIndex it  )  const [inline]
 

Get box indexed by it.

As a consequence of the C++ compiler being free to choose which version of operator[] when the object is technically non-const, we very often get 'BoxLayout closed' errors. This is a non-overloaded get method.

unsigned int BoxLayout::index const LayoutIndex index  )  const [inline]
 

Not a user function. Used in I/O routine.

bool BoxLayout::isClosed  )  const [inline]
 

Return true if close() has been called. Closed BoxLayout is always sorted.

bool BoxLayout::isSorted  )  const [inline]
 

Return true if sort() has been called.

LayoutIterator BoxLayout::layoutIterator  )  const
 

Iterator that processes through ALL the boxes in a BoxLayout.

Iterator that processes through ALL the boxes in a BoxLayout.

If BoxLayout is closed, then LayoutIterator will return the Boxes in sorted order.

int BoxLayout::numBoxes const int  procID  )  const
 

Returns the number of boxes assigned to a given procID.

BoxLayout& BoxLayout::operator= const BoxLayout a_rhs  ) 
 

Ref-counted assignment.

bool BoxLayout::operator== const BoxLayout rhs  )  const [inline]
 

Refcounted pointer check. Return true if these two objects share the same implementation.

Box & BoxLayout::operator[] const LayoutIndex it  )  [inline]
 

accessor operator. See also get(const DataIndex&).

const Box & BoxLayout::operator[] const LayoutIndex it  )  const [inline]
 

const accessor operator. See also get(const DataIndex&).

void BoxLayout::p  )  const [inline]
 

Invokes cout<<*this; pretty-print dump of BoxLayout.

void BoxLayout::print  )  const
 

Invokes cout<<*this; pretty-print dump of BoxLayout.

unsigned int BoxLayout::procID const LayoutIndex a_index  )  const [inline]
 

Returns the processor to which this box has been assigned. Not a user function, at least, not a new user function. It can be used safely at anytime, closed or open. A person needing this level of knowledge of the processor assignment should have non-trivial needs, like writing your own load balancer or such. Most user-level parallel coding needs can be addressed using the DataIterator class.

void BoxLayout::setIndexVector  )  [protected]
 

void BoxLayout::setProcID const LayoutIndex a_index,
unsigned int  a_procID
[inline]
 

Assign a Box in the BoxLayout to a processor. Requires the BoxLayout to be open.

unsigned int BoxLayout::size  )  const [inline]
 

Returns the total number of boxes in the BoxLayout.

void BoxLayout::sort  ) 
 

Sort the boxes of an open BoxLayout. No change if the BoxLayout is closed.


Friends And Related Function Documentation

void coarsen BoxLayout output,
const BoxLayout input,
int  refinement
[friend]
 

Coarsen a BoxLayout:

  • output must be open
  • input must be closed
  • refinement must be a positive non-zero integer
  • output and input do not share an implementation.

output is first deepCopy'ed from input, then coarsen(refinement) is called on each box of output.

output returns from this function closed.

LayoutIterators from input and output can perform interchangeably.

friend class DataIterator [friend]
 

friend class LayoutIterator [friend]
 

void refine BoxLayout output,
const BoxLayout input,
int  refinement
[friend]
 

Refine a BoxLayout:

  • output must be open
  • input must be closed
  • refinement must be a positive non-zero integer
  • output and input do not share an implementation.

output is first deepCopy'ed from input, then refine(refinement) is called on each box of output.

output returns from this function closed.

LayoutIterators from input and output can perform interchangeably.


Member Data Documentation

RefCountedPtr<Vector<Entry> > BoxLayout::m_boxes [protected]
 

RefCountedPtr<bool> BoxLayout::m_closed [protected]
 

RefCountedPtr<DataIterator> BoxLayout::m_dataIterator [protected]
 

RefCountedPtr<Vector<unsigned int> > BoxLayout::m_index [protected]
 

RefCountedPtr<int> BoxLayout::m_layout [protected]
 


The documentation for this class was generated from the following file:
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