Lunchbox  1.15.0
Multi-threaded C++ toolbox library for all application developers creating high-performance multi-threaded programs.
lunchbox::Buffer< T > Class Template Reference

A simple memory buffer with some helper functions. More...

#include <buffer.h>

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Public Member Functions

 Buffer ()
 Construct a new, empty buffer. More...
 
 Buffer (const uint64_t size)
 Construct a new buffer of the given size. More...
 
 Buffer (const Buffer &from)
 Copy constructor, copies data to new Buffer. More...
 
 Buffer (Buffer &&from)
 Move constructor, transfers data to new Buffer. More...
 
 ~Buffer ()
 Destruct the buffer. More...
 
void clear ()
 Flush the buffer, deleting all data. More...
 
T * pack ()
 Tighten the allocated memory to the size of the buffer. More...
 
Bufferoperator= (const Buffer &from)
 Assignment operator, copies data from Buffer. More...
 
Bufferoperator= (Buffer &&from)
 Move operator, transfers ownership. More...
 
T & operator[] (const uint64_t position)
 Direct access to the element at the given index. More...
 
const T & operator[] (const uint64_t position) const
 Direct const access to an element. More...
 
T * resize (const uint64_t newSize)
 Ensure that the buffer contains at least newSize elements. More...
 
void grow (const uint64_t newSize)
 Ensure that the buffer contains at least newSize elements. More...
 
T * reserve (const uint64_t newSize)
 Ensure that the buffer contains at least newSize elements. More...
 
T * reset (const uint64_t newSize)
 Set the buffer size and malloc enough memory. More...
 
void setZero ()
 Set the buffer content to 0. More...
 
void append (const T *data, const uint64_t size)
 Append elements to the buffer, increasing the size. More...
 
void append (const T &element)
 Append one element to the buffer. More...
 
void replace (const void *data, const uint64_t size)
 Replace the existing data with new data. More...
 
void replace (const Buffer &from)
 Replace the existing data. More...
 
void swap (Buffer &buffer)
 Swap the buffer contents with another Buffer. More...
 
T * getData ()
 
const T * getData () const
 
bool setSize (const uint64_t size)
 Set the size of the buffer without changing its allocation. More...
 
uint64_t getSize () const
 
uint64_t getNumBytes () const
 
bool isEmpty () const
 
uint64_t getMaxSize () const
 

Detailed Description

template<class T>
class lunchbox::Buffer< T >

A simple memory buffer with some helper functions.

std::vector does not implement optimizations for growing bitwise-movable vectors, i.e., it copy-constructs each element on growth.

This buffer just memcpy's elements, i.e., it should only be used for PODs since the copy constructor or assignment operator is not called on the copied elements. Primarily used for binary data, e.g., in eq::Image. The implementation works like a pool, that is, data is only released when the buffer is deleted or clear() is called.

Definition at line 43 of file buffer.h.

Constructor & Destructor Documentation

template<class T>
lunchbox::Buffer< T >::Buffer ( )
inline

Construct a new, empty buffer.

Version
1.0

Definition at line 47 of file buffer.h.

Referenced by lunchbox::Buffer< T >::Buffer().

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template<class T>
lunchbox::Buffer< T >::Buffer ( const uint64_t  size)
inlineexplicit

Construct a new buffer of the given size.

Version
1.0

Definition at line 50 of file buffer.h.

References lunchbox::Buffer< T >::Buffer(), and lunchbox::Buffer< T >::reset().

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template<class T >
lunchbox::Buffer< T >::Buffer ( const Buffer< T > &  from)
explicit

Copy constructor, copies data to new Buffer.

Version
1.14

Definition at line 21 of file buffer.ipp.

template<class T >
lunchbox::Buffer< T >::Buffer ( Buffer< T > &&  from)
explicit

Move constructor, transfers data to new Buffer.

Version
1.14

Definition at line 29 of file buffer.ipp.

template<class T>
lunchbox::Buffer< T >::~Buffer ( )
inline

Destruct the buffer.

Version
1.0

Definition at line 60 of file buffer.h.

References lunchbox::Buffer< T >::clear().

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Member Function Documentation

template<class T >
void lunchbox::Buffer< T >::append ( const T *  data,
const uint64_t  size 
)

Append elements to the buffer, increasing the size.

Version
1.0

Definition at line 106 of file buffer.ipp.

References lunchbox::Buffer< T >::resize().

Referenced by lunchbox::Buffer< T >::append(), and lunchbox::Buffer< T >::setZero().

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template<class T >
void lunchbox::Buffer< T >::append ( const T &  element)

Append one element to the buffer.

Version
1.0

Definition at line 116 of file buffer.ipp.

References lunchbox::Buffer< T >::append().

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template<class T>
void lunchbox::Buffer< T >::clear ( )
inline

Flush the buffer, deleting all data.

Version
1.0

Definition at line 63 of file buffer.h.

References lunchbox::Buffer< T >::operator=(), and lunchbox::Buffer< T >::pack().

Referenced by lunchbox::Buffer< T >::~Buffer().

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template<class T>
T* lunchbox::Buffer< T >::getData ( )
inline
Returns
a pointer to the data.
Version
1.0

Definition at line 140 of file buffer.h.

template<class T>
const T* lunchbox::Buffer< T >::getData ( ) const
inline
Returns
a const pointer to the data.
Version
1.0

Definition at line 143 of file buffer.h.

References lunchbox::Buffer< T >::setSize().

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template<class T>
uint64_t lunchbox::Buffer< T >::getMaxSize ( ) const
inline
Returns
the maximum size of the buffer.
Version
1.0

Definition at line 165 of file buffer.h.

template<class T>
uint64_t lunchbox::Buffer< T >::getNumBytes ( ) const
inline
Returns
the current storage size.
Version
1.5.1

Definition at line 159 of file buffer.h.

template<class T>
uint64_t lunchbox::Buffer< T >::getSize ( ) const
inline
Returns
the current number of elements.
Version
1.0

Definition at line 156 of file buffer.h.

template<class T >
void lunchbox::Buffer< T >::grow ( const uint64_t  newSize)

Ensure that the buffer contains at least newSize elements.

Existing data is retained. The size is increased, if necessary.

Version
1.0

Definition at line 82 of file buffer.ipp.

References lunchbox::Buffer< T >::resize().

Referenced by lunchbox::Buffer< T >::operator[]().

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template<class T>
bool lunchbox::Buffer< T >::isEmpty ( ) const
inline
Returns
true if the buffer is empty, false if not.
Version
1.0

Definition at line 162 of file buffer.h.

template<class T >
Buffer< T > & lunchbox::Buffer< T >::operator= ( const Buffer< T > &  from)

Assignment operator, copies data from Buffer.

Version
1.0

Definition at line 50 of file buffer.ipp.

References lunchbox::Buffer< T >::replace().

Referenced by lunchbox::Buffer< T >::clear().

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template<class T >
Buffer< T > & lunchbox::Buffer< T >::operator= ( Buffer< T > &&  from)

Move operator, transfers ownership.

Version
1.14

Definition at line 58 of file buffer.ipp.

template<class T>
T& lunchbox::Buffer< T >::operator[] ( const uint64_t  position)
inline

Direct access to the element at the given index.

Version
1.0

Definition at line 79 of file buffer.h.

template<class T>
const T& lunchbox::Buffer< T >::operator[] ( const uint64_t  position) const
inline

Direct const access to an element.

Version
1.0

Definition at line 83 of file buffer.h.

References lunchbox::Buffer< T >::grow(), lunchbox::Buffer< T >::reserve(), lunchbox::Buffer< T >::reset(), and lunchbox::Buffer< T >::resize().

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template<class T >
T * lunchbox::Buffer< T >::pack ( )

Tighten the allocated memory to the size of the buffer.

Returns
the new pointer to the first element.
Version
1.0

Definition at line 39 of file buffer.ipp.

Referenced by lunchbox::Buffer< T >::clear().

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template<class T >
void lunchbox::Buffer< T >::replace ( const void *  data,
const uint64_t  size 
)

Replace the existing data with new data.

Version
1.0

Definition at line 122 of file buffer.ipp.

References lunchbox::Buffer< T >::reserve().

Referenced by lunchbox::Buffer< T >::operator=(), and lunchbox::Buffer< T >::setZero().

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template<class T>
void lunchbox::Buffer< T >::replace ( const Buffer< T > &  from)
inline

Replace the existing data.

Version
1.5.1

Definition at line 134 of file buffer.h.

References lunchbox::Buffer< T >::replace(), and lunchbox::Buffer< T >::swap().

Referenced by lunchbox::Buffer< T >::replace().

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template<class T >
T * lunchbox::Buffer< T >::reserve ( const uint64_t  newSize)

Ensure that the buffer contains at least newSize elements.

Existing data is preserved.

Returns
the new pointer to the first element.
Version
1.0

Definition at line 88 of file buffer.ipp.

Referenced by lunchbox::Buffer< T >::operator[](), lunchbox::Buffer< T >::replace(), and lunchbox::Buffer< T >::reset().

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template<class T >
T * lunchbox::Buffer< T >::reset ( const uint64_t  newSize)

Set the buffer size and malloc enough memory.

Existing data may be deleted.

Returns
the new pointer to the first element.
Version
1.0

Definition at line 98 of file buffer.ipp.

References lunchbox::Buffer< T >::reserve(), and lunchbox::Buffer< T >::setSize().

Referenced by lunchbox::Buffer< T >::Buffer(), and lunchbox::Buffer< T >::operator[]().

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template<class T >
T * lunchbox::Buffer< T >::resize ( const uint64_t  newSize)

Ensure that the buffer contains at least newSize elements.

Existing data is retained. The size is set.

Returns
the new pointer to the first element.
Version
1.0

Definition at line 68 of file buffer.ipp.

Referenced by lunchbox::Buffer< T >::append(), lunchbox::Buffer< T >::grow(), and lunchbox::Buffer< T >::operator[]().

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template<class T >
bool lunchbox::Buffer< T >::setSize ( const uint64_t  size)

Set the size of the buffer without changing its allocation.

This method only modifies the size parameter. If the current allocation of the buffer is too small, it asserts, returns false and does not change the size.

Version
1.0

Definition at line 147 of file buffer.ipp.

Referenced by lunchbox::Buffer< T >::getData(), and lunchbox::Buffer< T >::reset().

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template<class T>
void lunchbox::Buffer< T >::setZero ( )
inline

Set the buffer content to 0.

Version
1.9.1

Definition at line 122 of file buffer.h.

References lunchbox::Buffer< T >::append(), and lunchbox::Buffer< T >::replace().

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template<class T >
void lunchbox::Buffer< T >::swap ( Buffer< T > &  buffer)

Swap the buffer contents with another Buffer.

Version
1.0

Definition at line 132 of file buffer.ipp.

Referenced by lunchbox::Buffer< T >::replace().

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