Oracle Coherence for C++ API: WrapperCollections::AbstractWrapperIterator Class Reference

Detailed Description

Iterator implementation which delegates all calls to another Iterator.

Public Types

typedef spec::Handle

Handle

AbstractWrapperIterator Handle definition.

typedef spec::View

View

AbstractWrapperIterator View definition.

typedef spec::Holder

Holder

AbstractWrapperIterator Holder definition.

Public Member Functions

virtual bool

hasNext () const

Determine if the iteration has another element.

Returns:: true if the iterator has another element

virtual Object::Holder

next ()

Return the next element in the iterated series.

Returns:: the next element in the iterated series

Exceptions:

coherence::lang::NoSuchElementException

if iteration has no more elements

virtual void

remove ()

Remove from the collection associated with this iterator, the last element returned from the iterator.

Exceptions:

UnsupportedOperationException

if removal is not supported

virtual void

toStream (std::ostream &out) const

Output a human-readable description of this Object to the given stream.

coherence::lang::operator<<(std::ostream, Object::View) is defined and will call into the toStream method, to output Objects. If a managed String object is desired, the COH_TO_STRING macro can be used to build up a String from streamable contents.

 Object::View vKey   = ...
 Object::View vValue = ...
 std::cout << vKey << " = " << vValue << std::endl;

 String::Handle hs = COH_TO_STRING(vKey << " = " << vValue);

Parameters:

out

the stream used to output the description

virtual size32_t

hashCode () const

Return a hash code value for the Object.

This method is supported for the benefit of hash-based containers.

The general contract of hashCode is:

Whenever it is invoked on the same Object more than once during an execution of an application, the hashCode method must consistently return the same value, provided no information used in equals comparisons on the object is modified. This value need not remain consistent from one execution of an application to another execution of the same application.
If two Objects are equal according to the equals method, then calling the hashCode method on each of the two Objects must produce the same value.
It is not required that if two Objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct results. However, the programmer should be aware that producing distinct results for unequal objects may improve the performance of hash-based containers.