template<typename _derivedT, typename _storedT, typename _indexT>
class mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >

CRTP base class for all circular buffers, providing the underlying memory management and accessors.

The CRTP derived classes implement a standard interface based on how they handle wrapping from the end to the beginning of the buffer.

Template Parameters

_derivedT	the child class type
_storedT	the type stored in teh circular buffer
_indexT	the index type, also used for sizes (must be signed)

Definition at line 78 of file circularBuffer.hpp.

#include <sigproc/circularBuffer.hpp>

Public Types
typedef _derivedT	derivedT
	The child class.

typedef _storedT	storedT
	The type stored in the circular buffer.

typedef _indexT	indexT
	The index type, also used for sizes.

Public Member Functions
	circularBufferBase ()
	Default c'tor.

	circularBufferBase (indexT maxEnt)
	Sizing constructor.

void	maxEntries (indexT maxEnt)
	Set the maximum size of the buffer.

indexT	maxEntries ()
	Get the maximum size of the buffer.

indexT	size () const
	Get the number of entries.

void	nextEntry (const storedT &newEnt)
	Add the next entry to the circular buffer.

void	nextEntry ()
	Move to the next entry in the circular buffer.

indexT	earliest ()
	Returns the index of the earliest entry.

indexT	latest ()
	Returns the index of the latest entry.

storedT &	operator[] (indexT idx)
	Get the entry at a given index.

const storedT &	operator[] (indexT idx) const

storedT &	at (indexT refEntry, indexT idx)
	Get the entry at a given index relative a fixed reference entry.

const storedT &	at (indexT refEntry, indexT idx) const
	Get the entry at a given index relative a fixed start entry, const version.

Protected Attributes
std::vector< storedT >	m_buffer
	The circular buffer storage.

indexT	m_maxEntries { 0 }
	The maximum number of entries to allow in the buffer before wrapping.

indexT	m_nextEntry { 0 }
	Index into m_buffer of the next entry. This is the oldest entry in the buffer.

indexT	m_latest { 0 }
	Index into m_buff of the latest entry. This is the newest entry in the buffer.

uint64_t	m_mono { 0 }

Member Typedef Documentation

◆ derivedT

template<typename _derivedT , typename _storedT , typename _indexT >

typedef _derivedT mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::derivedT

The child class.

Definition at line 81 of file circularBuffer.hpp.

◆ indexT

template<typename _derivedT , typename _storedT , typename _indexT >

typedef _indexT mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::indexT

The index type, also used for sizes.

Definition at line 84 of file circularBuffer.hpp.

◆ storedT

template<typename _derivedT , typename _storedT , typename _indexT >

typedef _storedT mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::storedT

The type stored in the circular buffer.

Definition at line 83 of file circularBuffer.hpp.

Constructor & Destructor Documentation

◆ circularBufferBase() [1/2]

template<class derivedT , typename storedT , typename indexT >

mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::circularBufferBase ( )

Default c'tor.

Definition at line 199 of file circularBuffer.hpp.

◆ circularBufferBase() [2/2]

template<class derivedT , typename storedT , typename indexT >

mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::circularBufferBase ( indexT maxEnt )

explicit

Sizing constructor.

Sets the maximum size of the buffer. Note that this will not be the size until a full set of entries have been added to the buffer.

Parameters

[in] maxEnt the maximum number of entries this buffer will hold

Definition at line 204 of file circularBuffer.hpp.

Member Function Documentation

◆ at() [1/2]

template<class derivedT , typename storedT , typename indexT >

storedT & mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::at	(	indexT	refEntry,
		indexT	idx
	)

Get the entry at a given index relative a fixed reference entry.

idx=0 is the entry at refEntry. idx=1 is the one after that. I.e., this counts forward from the oldest data

Returns: a reference to the indicated entry in the circular buffer.

Parameters

[in]	refEntry	the entry to start counting from
[in]	idx	the index of the entry to access

Definition at line 312 of file circularBuffer.hpp.

Referenced by mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::operator[]().

◆ at() [2/2]

template<class derivedT , typename storedT , typename indexT >

const storedT & mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::at	(	indexT	refEntry,
		indexT	idx
	)		const

Get the entry at a given index relative a fixed start entry, const version.

idx=0 is the entry at refEntry. idx=1 is the one after that. I.e., this counts forward from the oldest data

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Returns: a const reference to the indicated entry in the circular buffer.

Parameters

[in]	refEntry	the entry to start counting from
[in]	idx	the index of the entry to access

Definition at line 318 of file circularBuffer.hpp.

◆ earliest()

template<class derivedT , typename storedT , typename indexT >

indexT mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::earliest ( )

Returns the index of the earliest entry.

This is particularly useful for accessing entries with the at() function over an unchanging sequence if asynchronous updates are possible.

Definition at line 282 of file circularBuffer.hpp.

◆ latest()

template<class derivedT , typename storedT , typename indexT >

indexT mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::latest ( )

Returns the index of the latest entry.

Definition at line 288 of file circularBuffer.hpp.

◆ maxEntries() [1/2]

template<class derivedT , typename storedT , typename indexT >

indexT mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::maxEntries ( )

Get the maximum size of the buffer.

Note that this is not the current size of the buffer until at least maxEntries have been added. Use size() to check current size.

Returns: the maximum size of the buffer, m_maxEntries

Definition at line 225 of file circularBuffer.hpp.

◆ maxEntries() [2/2]

template<class derivedT , typename storedT , typename indexT >

void mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::maxEntries ( indexT maxEnt )

Set the maximum size of the buffer.

Note that this will not be the size until a full set of entries have been added to the buffer.

Parameters

[in] maxEnt the maximum number of entries this buffer will hold

Definition at line 210 of file circularBuffer.hpp.

◆ nextEntry() [1/2]

template<class derivedT , typename storedT , typename indexT >

void mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::nextEntry ( )

Move to the next entry in the circular buffer.

If not yet at maxEntries entries, this emplaces a new default constructed entry. Otherwise it increments counters so that the old latest entry is now the newest entry.

Definition at line 260 of file circularBuffer.hpp.

◆ nextEntry() [2/2]

template<class derivedT , typename storedT , typename indexT >

void mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::nextEntry ( const storedT & newEnt )

Add the next entry to the circular buffer.

Adds the entry (will incur a deep copy) and updates the wrapping system.

Parameters

[in] newEnt the new entry to add to the buffer

Definition at line 237 of file circularBuffer.hpp.

◆ operator[]() [1/2]

template<class derivedT , typename storedT , typename indexT >

storedT & mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::operator[] ( indexT idx )

Get the entry at a given index.

idx=0 is the earliest entry in the buffer. idx=1 is the one after that. I.e., this counts forward from the oldest data

Returns: a reference to the indicated entry in the circular buffer.

Parameters

[in] idx the index of the entry to access

Definition at line 300 of file circularBuffer.hpp.

References mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::at().

◆ operator[]() [2/2]

template<class derivedT , typename storedT , typename indexT >

const storedT & mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::operator[] ( indexT idx ) const

Parameters

[in] idx the index of the entry to access

Definition at line 306 of file circularBuffer.hpp.

◆ size()

template<class derivedT , typename storedT , typename indexT >

indexT mx::sigproc::circularBufferBase< derivedT, storedT, indexT >::size ( ) const

Get the number of entries.

Note that this is the current size. It will not be the same as maxEntries() until at least maxEntries have been added.

Definition at line 231 of file circularBuffer.hpp.

Member Data Documentation

◆ m_buffer

template<typename _derivedT , typename _storedT , typename _indexT >

std::vector<storedT> mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::m_buffer

protected

The circular buffer storage.

Definition at line 89 of file circularBuffer.hpp.

◆ m_latest

template<typename _derivedT , typename _storedT , typename _indexT >

indexT mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::m_latest { 0 }

protected

Index into m_buff of the latest entry. This is the newest entry in the buffer.

Definition at line 93 of file circularBuffer.hpp.

◆ m_maxEntries

template<typename _derivedT , typename _storedT , typename _indexT >

indexT mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::m_maxEntries { 0 }

protected

The maximum number of entries to allow in the buffer before wrapping.

Definition at line 91 of file circularBuffer.hpp.

◆ m_mono

template<typename _derivedT , typename _storedT , typename _indexT >

uint64_t mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::m_mono { 0 }

protected

A monotonic counter, which is incremented for each new entry, and reset on call to maxEntries.

Definition at line 95 of file circularBuffer.hpp.

◆ m_nextEntry

template<typename _derivedT , typename _storedT , typename _indexT >

indexT mx::sigproc::circularBufferBase< _derivedT, _storedT, _indexT >::m_nextEntry { 0 }

protected

Index into m_buffer of the next entry. This is the oldest entry in the buffer.

Definition at line 92 of file circularBuffer.hpp.

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

sigproc/circularBuffer.hpp

Public Types

Public Member Functions

Protected Attributes

Member Typedef Documentation

◆ derivedT

◆ indexT

◆ storedT

Constructor & Destructor Documentation

◆ circularBufferBase() [1/2]

◆ circularBufferBase() [2/2]

Member Function Documentation

◆ at() [1/2]

◆ at() [2/2]

◆ earliest()

◆ latest()

◆ maxEntries() [1/2]

◆ maxEntries() [2/2]

◆ nextEntry() [1/2]

◆ nextEntry() [2/2]

◆ operator[]() [1/2]

◆ operator[]() [2/2]

◆ size()

Member Data Documentation

◆ m_buffer

◆ m_latest

◆ m_maxEntries

◆ m_mono

◆ m_nextEntry