ns3::HeapScheduler Class Reference [Scheduler]

a binary heap event scheduler More...

#include <heap-scheduler.h>

Inheritance diagram for ns3::HeapScheduler:

Collaboration diagram for ns3::HeapScheduler:

List of all members.

Public Member Functions
virtual void	Insert (const Event &ev)
virtual bool	IsEmpty (void) const
virtual Event	PeekNext (void) const
virtual Event	RemoveNext (void)
virtual void	Remove (const Event &ev)

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Detailed Description

a binary heap event scheduler

This code started as a c++ translation of a java-based code written in 2005 to implement a heap sort. So, this binary heap is really a pretty straightforward implementation of the classic data structure. Not much to say about it.

What is smart about this code ?

• it does not use the index 0 in the array to avoid having to convert C-style array indexes (which start at zero) and heap-style indexes (which start at 1). This is why _all_ indexes start at 1, and that the index of the root is 1.
• It uses a slightly non-standard while loop for top-down heapify to move one if statement out of the loop.

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Member Function Documentation

virtual void ns3::HeapScheduler::Insert

(

const Event &

ev

)

[virtual]

Parameters:

ev

event to store in the event list

Implements ns3::Scheduler.

virtual bool ns3::HeapScheduler::IsEmpty

(

void

)

const [virtual]

Returns:

true if the event list is empty and false otherwise.

Implements ns3::Scheduler.

virtual Event ns3::HeapScheduler::PeekNext

(

void

)

const [virtual]

Returns:

a pointer to the next earliest event. The caller takes ownership of the returned pointer.

This method cannot be invoked if the list is empty.

Implements ns3::Scheduler.

virtual void ns3::HeapScheduler::Remove

(

const Event &

ev

)

[virtual]

Parameters:

ev

the event to remove

This methods cannot be invoked if the list is empty.

Implements ns3::Scheduler.

virtual Event ns3::HeapScheduler::RemoveNext

(

void

)

[virtual]

This method cannot be invoked if the list is empty. Remove the next earliest event from the event list.

Implements ns3::Scheduler.

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

• src/simulator/heap-scheduler.h