edm::VecArray< T, N > Class Template Reference

#include <VecArray.h>

Public Types
using	const_iterator = const value_type *
using	const_pointer = const value_type *
using	const_reference = const value_type &
using	difference_type = std::ptrdiff_t
using	iterator = value_type *
using	pointer = value_type *
using	reference = value_type &
using	size_type = unsigned int
using	value_type = T

Public Member Functions
reference	back ()
const_reference	back () const
iterator	begin () noexcept
const_iterator	begin () const noexcept
const_iterator	cbegin () const noexcept
const_iterator	cend () const noexcept
void	clear ()
pointer	data ()
const_pointer	data () const
template<typename... Args>
void	emplace_back (Args &&... args)
template<typename... Args>
void	emplace_back_unchecked (Args &&... args)
constexpr bool	empty () const noexcept
iterator	end () noexcept
const_iterator	end () const noexcept
reference	front ()
const_reference	front () const
reference	operator[] (size_type pos)
const_reference	operator[] (size_type pos) const
void	pop_back ()
void	push_back (const T &value)
void	push_back_unchecked (const T &value)
void	resize (unsigned int size)
constexpr size_type	size () const noexcept
void	swap (VecArray &other) noexcept(noexcept(std::swap(data_, other.data_)) &&noexcept(std::swap(size_, other.size_)))
	VecArray ()

Static Public Member Functions
static constexpr size_type	capacity () noexcept

Private Attributes
T	data_ [N]
unsigned int	size_

Detailed Description

template<typename T, unsigned int N>
class edm::VecArray< T, N >

A class for extending std::array with std::vector-like interface.

This class can be useful if the maximum length is known at compile-time (can use std::array), and that the length is rather small (maximum size of std::array is comparable with the overhead of std::vector). It is also free of dynamic memory allocations.

Note that the implemented interface is not complete compared to std::array or std:vector. Feel free contribute if further needs arise.

The second template argument is unsigned int (not size_t) on purpose to reduce the size of the class by 4 bytes (at least in Linux amd64). For all practical purposes even unsigned char could be enough.

Definition at line 28 of file VecArray.h.

Member Typedef Documentation

const_iterator

template<typename T, unsigned int N>

using edm::VecArray< T, N >::const_iterator = const value_type*

Definition at line 41 of file VecArray.h.

const_pointer

template<typename T, unsigned int N>

using edm::VecArray< T, N >::const_pointer = const value_type*

Definition at line 39 of file VecArray.h.

const_reference

template<typename T, unsigned int N>

using edm::VecArray< T, N >::const_reference = const value_type&

Definition at line 37 of file VecArray.h.

difference_type

template<typename T, unsigned int N>

using edm::VecArray< T, N >::difference_type = std::ptrdiff_t

Definition at line 35 of file VecArray.h.

iterator

template<typename T, unsigned int N>

using edm::VecArray< T, N >::iterator = value_type*

Definition at line 40 of file VecArray.h.

pointer

template<typename T, unsigned int N>

using edm::VecArray< T, N >::pointer = value_type*

Definition at line 38 of file VecArray.h.

reference

template<typename T, unsigned int N>

using edm::VecArray< T, N >::reference = value_type&

Definition at line 36 of file VecArray.h.

size_type

template<typename T, unsigned int N>

using edm::VecArray< T, N >::size_type = unsigned int

Definition at line 34 of file VecArray.h.

value_type

template<typename T, unsigned int N>

using edm::VecArray< T, N >::value_type = T

Definition at line 33 of file VecArray.h.

Constructor & Destructor Documentation

VecArray()

template<typename T, unsigned int N>

edm::VecArray< T, N >::VecArray ( )

inline

Definition at line 43 of file VecArray.h.

: data_{}, size_{0} {}

Member Function Documentation

back() [1/2]

template<typename T, unsigned int N>

reference edm::VecArray< T, N >::back ( )

inline

Definition at line 55 of file VecArray.h.

{ return data_[size_ - 1]; }

back() [2/2]

template<typename T, unsigned int N>

const_reference edm::VecArray< T, N >::back ( ) const

inline

Definition at line 57 of file VecArray.h.

{ return data_[size_ - 1]; }

begin() [1/2]

template<typename T, unsigned int N>

iterator edm::VecArray< T, N >::begin ( void  )

inlinenoexcept

Definition at line 61 of file VecArray.h.

Referenced by edm::VecArray< std::pair< int, int >, 9 >::end().

{ return data_; }

begin() [2/2]

template<typename T, unsigned int N>

const_iterator edm::VecArray< T, N >::begin ( void  ) const

inlinenoexcept

Definition at line 62 of file VecArray.h.

{ return data_; }

capacity()

template<typename T, unsigned int N>

static constexpr size_type edm::VecArray< T, N >::capacity ( )

inlinestaticnoexcept

Definition at line 71 of file VecArray.h.

Referenced by ClusterShapeHitFilter::getSizes().

{ return N; }

cbegin()

template<typename T, unsigned int N>

const_iterator edm::VecArray< T, N >::cbegin ( ) const

inlinenoexcept

Definition at line 63 of file VecArray.h.

Referenced by edm::VecArray< std::pair< int, int >, 9 >::cend().

{ return data_; }

cend()

template<typename T, unsigned int N>

const_iterator edm::VecArray< T, N >::cend ( ) const

inlinenoexcept

Definition at line 67 of file VecArray.h.

{ return cbegin() + size_; }

clear()

template<typename T, unsigned int N>

void edm::VecArray< T, N >::clear ( void  )

inline

Definition at line 73 of file VecArray.h.

Referenced by ClusterShapeHitFilter::getSizes().

{ size_ = 0; }

data() [1/2]

template<typename T, unsigned int N>

pointer edm::VecArray< T, N >::data ( )

inline

Definition at line 58 of file VecArray.h.

{ return data_; }

data() [2/2]

template<typename T, unsigned int N>

const_pointer edm::VecArray< T, N >::data ( ) const

inline

Definition at line 59 of file VecArray.h.

{ return data_; }

emplace_back()

template<typename T, unsigned int N>

template<typename... Args>

void edm::VecArray< T, N >::emplace_back ( Args &&...  args )

inline

Definition at line 90 of file VecArray.h.

Referenced by ClusterTPAssociation::addKeyID(), PixelInactiveAreaFinder::InactiveAreas::areasAndLayerSets(), and PixelInactiveAreaFinder::InactiveAreas::spansAndLayerSets().

                                      {
      if (size_ >= N)
        throw std::length_error("emplace_back on already-full VecArray (N=" + std::to_string(N) + ")");
      emplace_back_unchecked(std::forward<Args>(args)...);
    }

emplace_back_unchecked()

template<typename T, unsigned int N>

template<typename... Args>

void edm::VecArray< T, N >::emplace_back_unchecked ( Args &&...  args )

inline

Definition at line 98 of file VecArray.h.

Referenced by edm::VecArray< std::pair< int, int >, 9 >::emplace_back().

                                                {
      data_[size_] = T(std::forward<Args>(args)...);
      ++size_;
    }

empty()

template<typename T, unsigned int N>

constexpr bool edm::VecArray< T, N >::empty ( void  ) const

inlinenoexcept

Definition at line 69 of file VecArray.h.

{ return size_ == 0; }

end() [1/2]

template<typename T, unsigned int N>

iterator edm::VecArray< T, N >::end ( void  )

inlinenoexcept

Definition at line 65 of file VecArray.h.

{ return begin() + size_; }

end() [2/2]

template<typename T, unsigned int N>

const_iterator edm::VecArray< T, N >::end ( void  ) const

inlinenoexcept

Definition at line 66 of file VecArray.h.

{ return begin() + size_; }

front() [1/2]

template<typename T, unsigned int N>

reference edm::VecArray< T, N >::front ( )

inline

Definition at line 50 of file VecArray.h.

Referenced by PixelClusterShapeExtractor::processRec().

{ return data_[0]; }

front() [2/2]

template<typename T, unsigned int N>

const_reference edm::VecArray< T, N >::front ( ) const

inline

Definition at line 52 of file VecArray.h.

{ return data_[0]; }

operator[]() [1/2]

template<typename T, unsigned int N>

reference edm::VecArray< T, N >::operator[] ( size_type  pos )

inline

Definition at line 46 of file VecArray.h.

{ return data_[pos]; }

operator[]() [2/2]

template<typename T, unsigned int N>

const_reference edm::VecArray< T, N >::operator[] ( size_type  pos ) const

inline

Definition at line 48 of file VecArray.h.

{ return data_[pos]; }

pop_back()

template<typename T, unsigned int N>

void edm::VecArray< T, N >::pop_back ( )

inline

Definition at line 104 of file VecArray.h.

Referenced by edm::VecArray< std::pair< int, int >, 9 >::resize().

{ --size_; }

push_back()

template<typename T, unsigned int N>

void edm::VecArray< T, N >::push_back ( const T &  value )

inline

Definition at line 76 of file VecArray.h.

                                   {
      if (size_ >= N)
        throw std::length_error("push_back on already-full VecArray (N=" + std::to_string(N) + ")");
      push_back_unchecked(value);
    }

push_back_unchecked()

template<typename T, unsigned int N>

void edm::VecArray< T, N >::push_back_unchecked ( const T &  value )

inline

Definition at line 83 of file VecArray.h.

Referenced by ClusterShapeHitFilter::getSizes(), and edm::VecArray< std::pair< int, int >, 9 >::push_back().

                                             {
      data_[size_] = value;
      ++size_;
    }

resize()

template<typename T, unsigned int N>

void edm::VecArray< T, N >::resize ( unsigned int  size )

inline

Definition at line 106 of file VecArray.h.

                                   {
      if (size > N)
        throw std::length_error("Requesting size " + std::to_string(size) + " while maximum allowed is " +
                                std::to_string(N));

      while (size < size_)
        pop_back();
      size_ = size;
    }

size()

template<typename T, unsigned int N>

constexpr size_type edm::VecArray< T, N >::size ( void  ) const

inlinenoexcept

Definition at line 70 of file VecArray.h.

Referenced by ntupleDataFormat._Collection::__iter__(), ntupleDataFormat._Collection::__len__(), ClusterTPAssociation::checkKeyProductID(), PixelClusterShapeExtractor::processRec(), and edm::VecArray< std::pair< int, int >, 9 >::resize().

{ return size_; }

swap()

template<typename T, unsigned int N>

void edm::VecArray< T, N >::swap ( VecArray< T, N > &  other )

inlinenoexcept

Definition at line 116 of file VecArray.h.

                                                                                                                     {
      std::swap(data_, other.data_);
      std::swap(size_, other.size_);
    }

Member Data Documentation

data_

template<typename T, unsigned int N>

T edm::VecArray< T, N >::data_[N]

private

Definition at line 29 of file VecArray.h.

Referenced by edm::VecArray< std::pair< int, int >, 9 >::back(), edm::VecArray< std::pair< int, int >, 9 >::begin(), edm::VecArray< std::pair< int, int >, 9 >::cbegin(), edm::VecArray< std::pair< int, int >, 9 >::data(), edm::VecArray< std::pair< int, int >, 9 >::emplace_back_unchecked(), edm::VecArray< std::pair< int, int >, 9 >::front(), edm::VecArray< std::pair< int, int >, 9 >::operator[](), edm::VecArray< std::pair< int, int >, 9 >::push_back_unchecked(), and edm::VecArray< std::pair< int, int >, 9 >::swap().

size_

template<typename T, unsigned int N>

unsigned int edm::VecArray< T, N >::size_

private

Definition at line 30 of file VecArray.h.

Referenced by edm::VecArray< std::pair< int, int >, 9 >::back(), edm::VecArray< std::pair< int, int >, 9 >::cend(), edm::VecArray< std::pair< int, int >, 9 >::clear(), edm::VecArray< std::pair< int, int >, 9 >::emplace_back(), edm::VecArray< std::pair< int, int >, 9 >::emplace_back_unchecked(), edm::VecArray< std::pair< int, int >, 9 >::empty(), edm::VecArray< std::pair< int, int >, 9 >::end(), edm::VecArray< std::pair< int, int >, 9 >::pop_back(), edm::VecArray< std::pair< int, int >, 9 >::push_back(), edm::VecArray< std::pair< int, int >, 9 >::push_back_unchecked(), edm::VecArray< std::pair< int, int >, 9 >::resize(), edm::VecArray< std::pair< int, int >, 9 >::size(), and edm::VecArray< std::pair< int, int >, 9 >::swap().