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PArrayObjects Class Reference

An array of objects. More...

`#include <array.h>`

Inheritance diagram for PArrayObjects:
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Collaboration diagram for PArrayObjects:
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## Public Member Functions
Construction
PINLINE | PArrayObjects (PINDEX initialSize=0)
| Create a new array of objects. More...
Overrides from class PObject
virtual Comparison | Compare (const PObject &obj) const
| Get the relative rank of the two arrays. More...
Overrides from class PContainer
virtual PINDEX | GetSize () const
| Get size of array. More...
virtual PBoolean | SetSize (PINDEX newSize)
| Set the size of the array in objects. More...
Overrides from class PCollection
virtual PINDEX | Append (PObject *obj)
| Append a new object to the collection. More...
virtual PINDEX | Insert (const PObject &before, PObject *obj)
| Insert a new object immediately before the specified object. More...
virtual PINDEX | InsertAt (PINDEX index, PObject *obj)
| Insert a new object at the specified ordinal index. More...
virtual PBoolean | Remove (const PObject *obj)
| Remove the object from the collection. More...
virtual PObject * | RemoveAt (PINDEX index)
| Remove the object at the specified ordinal index from the collection. More...
virtual PBoolean | SetAt (PINDEX index, PObject *val)
| Set the object at the specified ordinal position to the new value. More...
virtual PObject * | GetAt (PINDEX index) const
| Get the object at the specified ordinal position. More...
virtual PINDEX | GetObjectsIndex (const PObject *obj) const
| Search the collection for the specific instance of the object. More...
virtual PINDEX | GetValuesIndex (const PObject &obj) const
| Search the collection for the specified value of the object. More...
virtual void | RemoveAll ()
| Remove all of the elements in the collection. More...
Public Member Functions inherited from PCollection
| PCollection (PINDEX initialSize=0)
| Create a new collection. More...
virtual void | PrintOn (ostream &strm) const
| Print the collection on the stream. More...
PINLINE void | AllowDeleteObjects (PBoolean yes=true)
| Allow or disallow the deletion of the objects contained in the collection. More...
void | DisallowDeleteObjects ()
| Disallow the deletion of the objects contained in the collection. More...
Public Member Functions inherited from PContainer
| PContainer (PINDEX initialSize=0)
| Create a new unique container. More...
| PContainer (const PContainer &cont)
| Create a new refernce to container. More...
PContainer & | operator= (const PContainer &cont)
| Assign one container reference to another. More...
virtual | ~PContainer ()
| Destroy the container class. More...
PBoolean | SetMinSize (PINDEX minSize)
| Set the minimum size of container. More...
virtual PBoolean | IsEmpty () const
| Determine if the container is empty. More...
PBoolean | IsUnique () const
| Determine if container is unique reference. More...
virtual PBoolean | MakeUnique ()
| Make this instance to be the one and only reference to the container contents. More...
Public Member Functions inherited from PObject
unsigned | GetTraceContextIdentifier () const
| Get PTRACE context identifier. More...
void | SetTraceContextIdentifier (unsigned id)
void | GetTraceContextIdentifier (PObject &obj)
void | GetTraceContextIdentifier (PObject *obj)
void | SetTraceContextIdentifier (const PObject &obj)
void | SetTraceContextIdentifier (const PObject *obj)
virtual | ~PObject ()
virtual PObject * | Clone () const
| Create a copy of the class on the heap. More...
template<class CLS >
CLS * | CloneAs () const
| As for Clone() but converts to specified type. More...
virtual PINDEX | HashFunction () const
| This function yields a hash value required by the `PDictionary` class. More...
virtual Comparison | CompareObjectMemoryDirect (const PObject &obj) const
| Determine the byte wise comparison of two objects. More...
bool | operator== (const PObject &obj) const
| Compare the two objects. More...
bool | operator!= (const PObject &obj) const
| Compare the two objects. More...
bool | operator< (const PObject &obj) const
| Compare the two objects. More...
bool | operator> (const PObject &obj) const
| Compare the two objects. More...
bool | operator<= (const PObject &obj) const
| Compare the two objects. More...
bool | operator>= (const PObject &obj) const
| Compare the two objects. More...
virtual const char * | GetClass (unsigned ancestor=0) const
| Get the current dynamic type of the object instance. More...
PBoolean | IsClass (const char *cls) const
virtual PBoolean | InternalIsDescendant (const char *clsName) const
| Determine if the dynamic type of the current instance is a descendent of the specified class. More...
__inline const PObject * | PTraceObjectInstance () const
virtual void | ReadFrom (istream &strm)
| Input the contents of the object from the stream. More...

## Protected Attributes
PBaseArray< PObject * > * | theArray

## Additional Inherited Members
Public Types inherited from PObject
enum | Comparison { LessThan = -1, EqualTo = 0, GreaterThan = 1 }
| Result of the comparison operation performed by the `Compare()` function. More...
Static Public Member Functions inherited from PObject
static Comparison | InternalCompareObjectMemoryDirect (const PObject *obj1, const PObject *obj2, PINDEX size)
| Internal function caled from CompareObjectMemoryDirect() More...
static const char * | Class ()
| Get the name of the class as a C string. More...
static __inline const PObject * | PTraceObjectInstance (const char *)
static __inline const PObject * | PTraceObjectInstance (const PObject *obj)
Protected Member Functions inherited from PCollection
PINLINE | PCollection (int dummy, const PCollection *coll)
| Constructor used in support of the Clone() function. More...
Friends inherited from PObject

## Detailed Description

An array of objects.

This class is a collection of objects which are descendents of the PObject class. It is implemeted as a dynamic, linear array of pointers to the objects.

The implementation of an array allows very fast random access to items in the collection, but has severe penalties for inserting and deleting objects as all other objects must be moved to accommodate the change.

An array of objects may have "gaps" in it. These are array entries that contain NULL as the object pointer.

The PArrayObjects class would very rarely be descended from directly by the user. The `PARRAY` macro would normally be used to create a class. That will instantiate the template based on `PArray` or directly declare and define the class (using inline functions) if templates are not being used.

The `PArray` class or `PARRAY` macro will define the correctly typed operators for pointer access (operator const T *) and subscript access (operator[]).

## Constructor & Destructor Documentation

PINLINE PArrayObjects::PArrayObjects | ( | PINDEX | initialSize = `0` | ) |

Create a new array of objects.

The array is initially set to the specified size with each entry having NULL as is pointer value.

Note that by default, objects placed into the list will be deleted when removed or when all references to the list are destroyed.

Parameters

  initialSize | Initial number of objects in the array.

## Member Function Documentation

virtual PINDEX PArrayObjects::Append | ( | PObject * | obj | ) |
| virtual

Append a new object to the collection.

This will increase the size of the array by one and place the new object at that position.

Returns
  Index of the newly added object.

Parameters

  obj | New object to place into the collection.

Implements PCollection.

virtual Comparison PArrayObjects::Compare | ( | const PObject & | obj | ) | const
| virtual

Get the relative rank of the two arrays.

The following algorithm is employed for the comparison:

- `EqualTo` if the two array memory blocks are identical in length and each objects values, not pointer, are equal.

- `LessThan` if the instances object value at an ordinal position is less than the corresponding objects value in the `obj` parameters array. This is also returned if all objects are equal and the instances array length is less than the `obj` parameters array length.

- `GreaterThan` if the instances object value at an ordinal position is greater than the corresponding objects value in the `obj` parameters array. This is also returned if all objects are equal and the instances array length is greater than the `obj` parameters array length.

Returns
  Comparison of the two objects, `EqualTo` for same, `LessThan` for `obj` logically less than the object and `GreaterThan` for `obj` logically greater than the object.

Parameters

  obj | Other `PAbstractArray` to compare against.

Reimplemented from PObject.

virtual PObject* PArrayObjects::GetAt | ( | PINDEX | index | ) | const
| virtual

Get the object at the specified ordinal position.

If the index was greater than the size of the collection then NULL is returned.

Returns
  Pointer to object at the specified index.

Parameters

  index | Index position in the collection of the object.

Implements PCollection.

Referenced by PArray< PODBC::Field >::operator[]().

virtual PINDEX PArrayObjects::GetObjectsIndex | ( | const PObject * | obj | ) | const
| virtual

Search the collection for the specific instance of the object.

The object pointers are compared, not the values. A simple linear search from ordinal position zero is performed.

Returns
  Ordinal index position of the object, or `P_MAX_INDEX`.

Parameters

  obj | Object to find.

Implements PCollection.

virtual PINDEX PArrayObjects::GetSize | ( |  | ) | const
| virtual

Get size of array.

Reimplemented from PContainer.

Referenced by PXMLRPCStructBase::GetNumVariables(), and PSafeDictionary< K, D >::iterator_base::SetPosition().

virtual PINDEX PArrayObjects::GetValuesIndex | ( | const PObject & | obj | ) | const
| virtual

Search the collection for the specified value of the object.

The object values are compared, not the pointers. So the objects in the collection must correctly implement the PObject::Compare() function. A simple linear search from ordinal position zero is performed.

Returns
  Ordinal index position of the object, or `P_MAX_INDEX`.

Implements PCollection.

Referenced by PSafeDictionary< K, D >::iterator_base::iterator_base().

virtual PINDEX PArrayObjects::Insert | ( | const PObject & | before,
|  | PObject * | obj
| ) |  |
| virtual

Insert a new object immediately before the specified object.

If the object to insert before is not in the collection then the equivalent of the `Append()` function is performed.

All objects, including the `before` object are shifted up one in the array.

Note that the object values are compared for the search of the `before` parameter, not the pointers. So the objects in the collection must correctly implement the PObject::Compare() function.

Returns
  index of the newly inserted object.

Parameters

  before | Object value to insert before.
  obj | New object to place into the collection.

Implements PCollection.

virtual PINDEX PArrayObjects::InsertAt | ( | PINDEX | index,
|  | PObject * | obj
| ) |  |
| virtual

Insert a new object at the specified ordinal index.

If the index is greater than the number of objects in the collection then the equivalent of the `Append()` function is performed.

All objects, including the `index` position object are shifted up one in the array.

Returns
  Index of the newly inserted object.

Parameters

  index | Index position in collection to place the object.
  obj | New object to place into the collection.

Implements PCollection.

virtual PBoolean PArrayObjects::Remove | ( | const PObject * | obj | ) |
| virtual

Remove the object from the collection.

If the `AllowDeleteObjects` option is set then the object is also deleted.

All objects are shifted down to fill the vacated position.

Returns
  `true` if the object was in the collection.

Parameters

  obj | Existing object to remove from the collection.

Implements PCollection.

virtual void PArrayObjects::RemoveAll | ( |  | ) |
| virtual

Remove all of the elements in the collection.

This operates by continually calling `RemoveAt()` until there are no objects left.

The objects are removed from the last, at index (GetSize()-1) toward the first at index zero.

Reimplemented from PCollection.

virtual PObject* PArrayObjects::RemoveAt | ( | PINDEX | index | ) |
| virtual

Remove the object at the specified ordinal index from the collection.

If the `AllowDeleteObjects` option is set then the object is also deleted.

All objects are shifted down to fill the vacated position.

Note if the `index` is beyond the size of the collection then the function will assert.

Returns
  Pointer to the object being removed, or NULL if it was deleted.

Parameters

  index | Index position in collection of object to remove.

Implements PCollection.

virtual PBoolean PArrayObjects::SetAt | ( | PINDEX | index,
|  | PObject * | val
| ) |  |
| virtual

Set the object at the specified ordinal position to the new value.

This will overwrite the existing entry. If the `AllowDeleteObjects` option is set then the old object is also deleted.

Returns
  `true` if the object was successfully added.

Parameters

  index | Index position in collection to set.
  val | New value to place into the collection.

Implements PCollection.

virtual PBoolean PArrayObjects::SetSize | ( | PINDEX | newSize | ) |
| virtual

Set the size of the array in objects.

A new array may be allocated to accomodate the new number of objects. If the array increases in size then the new object pointers are initialised to NULL. If the array is made smaller then the data beyond the new size is lost.

Returns
  true if the memory for the array was allocated successfully.

Parameters

  newSize | New size of the array in objects.

Implements PContainer.

## Member Data Documentation

PBaseArray<PObject *>* PArrayObjects::theArray
| protected

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

- array.h