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ring-span lite - A C++yy-like ring_span type for C++98, C++11 and later in a single-file header-only library

ring-span lite: A circular buffer view for C++98 and later

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Contents

Example usage

#include "nonstd/ring_span.hpp"
#include <iostream>
#include <numeric>

template< typename T, size_t N >
inline size_t dim( T (&arr)[N] ) { return N; }

template< typename T, class Popper>
inline std::ostream & operator<<( std::ostream & os, ::nonstd::ring_span<T, Popper> const & rs )
{
    os << "[ring_span: "; std::copy( rs.begin(), rs.end(), std::ostream_iterator<T>(os, ", ") ); return os << "]";
}

int main()
{
    double arr[]   = { 2.0 , 3.0, 5.0, };
    double coeff[] = { 0.25, 0.5, 0.25 };

    nonstd::ring_span<double> buffer( arr, arr + dim(arr), arr, dim(arr) );

    std::cout << buffer << "\n";

    // new sample:
    buffer.push_back( 7.0 );

    std::cout << buffer << "\n";

    double result = std::inner_product( buffer.begin(), buffer.end(), coeff, 0.0 );

    std::cout << "filter result: " << result << "\n";
}

Compile and run

prompt> g++ -std=c++98 -Wall -I../include -o 01-filter.exe 01-filter.cpp && 01-filter.exe
[ring_span: 2, 3, 5, ]
[ring_span: 3, 5, 7, ]
filter result: 5

Or to run with Buck:

prompt> buck run example/:01-filter

In a nutshell

ring-span lite is a single-file header-only library to represent a circular buffer view on a container. The library aims to provide a C++yy-like ring_span for use with C++98 and later [1][2]. Its initial code is inspired on the reference implementation by Arthur O'Dwyer [3]. It is my intention to let the interface of this ring_span follow the unfolding standard one.

This library also includes header <ring.hpp> to provide a data-owning ring buffer.

Features and properties of ring-span lite are ease of installation (single header), freedom of dependencies other than the standard library.

Limitations of ring-span lite are ... .

License

ring-span lite is distributed under the Boost Software License.

Dependencies

ring-span lite has no other dependencies than the C++ standard library.

Installation

ring-span lite is a single-file header-only library. Put ring_span.hpp in the include folder directly into the project source tree or somewhere reachable from your project.

Synopsis

Contents

Types in namespace nonstd

Purpose p0059 Type Notes
Circular buffer view βœ“/– template<
 class T
 , class Popper = default_popper<T>
 , bool CapacityIsPowerOf2 = false
>
class ring_span		 See Note 1 below.
Ignore element βœ“ template< class T >
class null_popper		 Β 
Return element βœ“ template< class T >
class default_popper		 Β 
Return element, replace original βœ“ template< class T >
class copy_popper		 Β 

Note 1: CapacityIsPowerOf2 is an extension (nsrs_CONFIG_STRICT_P0059=0).With CapacityIsPowerOf2 being true, method normalize_() is optimized to use bitwise and instead of modulo division.

Interface of ring-span lite

Class ring_span

Kind p0059 Type / Method Note / Result
Various types βœ“ type ring_span<T, Popper[, CapacityIsPowerOf2]>
Β  βœ“ size_type Β 
Value types βœ“ value_type Β 
Β  βœ“ pointer Β 
Β  βœ“ reference Β 
Β  βœ“ const_reference Β 
Iterator types βœ“ iterator Β 
Β  βœ“ const_iterator Β 
Β  – reverse_iterator Β 
Β  – const_reverse_iterator Β 
Construction βœ“ ring_span(
It begin, It end
, Popper popper = Popper() ) noexcept		 create empty span of
distance(begin,end) capacity
Β  βœ“ ring_span(
It begin, It end
, It first, size_type size
, Popper popper = Popper() ) noexcept		 create partially filled span of
distance(begin,end) capacity,
size elements
Β  βœ“ ring_span( ring_span && ) = default (>= C++11)
Β  βœ“ ring_span& operator=( ring_span && ) = default (>= C++11)
Β  βœ“ ring_span( ring_span const & ) implicitly deleted (>= C++11)
Β  βœ“ ring_span & operator=( ring_span const & ); implicitly deleted (>= C++11)
Β  – ring_span( ring_span const & ) declared private (< C++11)
Β  – ring_span & operator=( ring_span const & ); declared private (< C++11)
Iteration βœ“ begin() noexcept iterator
Β  βœ“ begin() noexcept const_iterator
Β  βœ“ cbegin() noexcept const_iterator
Β  βœ“ end() noexcept iterator
Β  βœ“ end() noexcept const_iterator
Β  βœ“ cend() noexcept const_iterator
Reverse iter. – rbegin() noexcept reverse_iterator
Β  – rbegin() noexcept const_reverse_iterator
Β  – crbegin() noexcept const_reverse_iterator
Β  – rend() noexcept reverse_iterator
Β  – rend() noexcept const_reverse_iterator
Β  – crend() noexcept const_reverse_iterator
Observation βœ“ empty() noexcept true if empty
Β  βœ“ full() noexcept true if full
Β  βœ“ size() noexcept current number of elements
Β  βœ“ capacity() noexcept maximum number of elements
Element access βœ“ front() noexcept reference to element at front
Β  βœ“ front() noexcept const_reference to element at front
Β  βœ“ back() noexcept reference to back element at back
Β  βœ“ back() noexcept const_reference to element at back
Β  – operator[]( size_type idx ) noexcept reference to element at specified index
Β  – operator[]( size_type idx ) noexcept const_reference to element at specified index
Elem.extraction βœ“ pop_front() Popper::return_type (p0059: auto)
Β  – pop_back() Popper::return_type
Elem.insertion βœ“ push_back( value_type const & value ) noexcept(…) void; restrained (>= C++11)
Β  – push_back( value_type const & value ) void; unrestrained (< C++11)
Β  βœ“ push_back( value_type && value ) noexcept(…) void; restrained (>= C++11)
Β  βœ“ emplace_back( Args &&... args ) noexcept(…) void; restrained (>= C++11)
Β  – push_front( value_type const & value ) noexcept(…) void; restrained (>= C++11)
Β  – push_front( value_type const & value ) void; unrestrained (< C++11)
Β  – push_front( value_type && value ) noexcept(…) void; restrained (>= C++11)
Β  – emplace_front( Args &&... args ) noexcept(…) void; restrained (>= C++11)
Swap βœ“ swap( ring_span & rhs ) noexcept void;

Class ring_iterator

Kind p0059 Type / Method Note / Result
Various types βœ“ type ring_span< T, Popper >
Β  βœ“ difference_type Β 
Value types βœ“ value_type Β 
Β  βœ“ pointer Β 
Β  βœ“ reference Β 
Category βœ“ iterator_category Β 
Construction βœ“ ring_iterator() = default (>= C++11)
Β  – ring_iterator() (< C++11)
Conversion – operator ring_iterator<…,true>() const noexcept const ring_iterator
Element access βœ“ operator*() const noexcept reference
Increment βœ“ operator++() noexcept ring_iterator<…> &
Β  βœ“ operator++( int ) noexcept ring_iterator<…>
Decrement βœ“ operator--() noexcept ring_iterator<…> &
Β  βœ“ operator--( int ) noexcept ring_iterator<…>
Addition βœ“ operator+=( int i ) noexcept ring_iterator<…> &
Β  βœ“ operator-=( int i ) noexcept ring_iterator<…> &
Difference – operator-( ring_iterator<…> const & rhs ) difference_type, Note 1
Comparison βœ“ operator==( ring_iterator<…> const & rhs ) const noexcept bool, Note 1
Β  βœ“ operator!=( ring_iterator<…> const & rhs ) const noexcept bool, Note 1
Β  βœ“ operator<( ring_iterator<…> const & rhs ) const noexcept bool, Note 1
Β  βœ“ operator<=( ring_iterator<…> const & rhs ) const noexcept bool, Note 1
Β  βœ“ operator>( ring_iterator<…> const & rhs ) const noexcept bool, Note 1
Β  βœ“ operator>=( ring_iterator<…> const & rhs ) const noexcept bool, Note 1

Note 1: accepts lhs and rhs of different const-ness.

Non-member functions for ring-span lite

Kind p0059 Function Note / Result
Swap –/βœ“ swap( ring_span<…> & lhs, ring_span<…> & rhs ) void
Iterator offset βœ“ operator+( ring_iterator<…> it, int i ) noexcept ring_iterator<…>
Β  βœ“ operator-( ring_iterator<…> it, int i ) noexcept ring_iterator<…>

Legenda: – not in proposalβ€‚Β·β€‚βœ“ in proposal · –/βœ“ not in proposal/in sg14 code

Class ring

Kind Type / Method Note / Result
Circular buffer template<
 class Container
 , bool CapacityIsPowerOf2 = false
>
class ring		 See Note 1 below.
Various types size_type Β 
Value types value_type Β 
Β  reference Β 
Β  const_reference Β 
Iterator types iterator Β 
Β  const_iterator Β 
Β  reverse_iterator Β 
Β  const_reverse_iterator Β 
Construction ring(size_type size) create empty ring of capacity size
Iteration begin() noexcept iterator
Β  begin() noexcept const_iterator
Β  cbegin() noexcept const_iterator
Β  end() noexcept iterator
Β  end() noexcept const_iterator
Β  cend() noexcept const_iterator
Reverse iter. rbegin() noexcept reverse_iterator
Β  rbegin() noexcept const_reverse_iterator
Β  crbegin() noexcept const_reverse_iterator
Β  rend() noexcept reverse_iterator
Β  rend() noexcept const_reverse_iterator
Β  crend() noexcept const_reverse_iterator
Observation empty() noexcept true if empty
Β  full() noexcept true if full
Β  size() noexcept current number of elements
Β  capacity() noexcept maximum number of elements
Element access front() noexcept reference to element at front
Β  front() noexcept const_reference to element at front
Β  back() noexcept reference to back element at back
Β  back() noexcept const_reference to element at back
Element access front() noexcept reference to element at front
Β  front() noexcept const_reference to element at front
Β  back() noexcept reference to back element at back
Β  back() noexcept const_reference to element at back
Β  operator[]( size_type idx ) noexcept reference to element at specified index
Β  operator[]( size_type idx ) noexcept const_reference to element at specified index
Elem.extraction pop_front() Popper::return_type
Β  pop_back() Popper::return_type
Elem.insertion & push_back( value_type const & value ) noexcept(…) void; restrained (>= C++11)
Β  push_back( value_type const & value ) void; unrestrained (< C++11)
Β  push_back( value_type && value ) noexcept(…) void; restrained (>= C++11)
Β  emplace_back( Args &&... args ) noexcept(…) void; restrained (>= C++11)
Β  push_front( value_type const & value ) noexcept(…) void; restrained (>= C++11)
Β  push_front( value_type const & value ) void; unrestrained (< C++11)
Β  push_front( value_type && value ) noexcept(…) void; restrained (>= C++11)
Β  emplace_front( Args &&... args ) noexcept(…) void; restrained (>= C++11)
Swap swap( ring_span & rhs ) noexcept void;

Note 1: CapacityIsPowerOf2 is an extension (nsrs_CONFIG_STRICT_P0059=0).With CapacityIsPowerOf2 being true, method normalize_() is optimized to use bitwise and instead of modulo division. Class default_popper is used as popper.

Configuration macros

Tweak header

If the compiler supports __has_include(), ring-span lite supports the tweak header mechanism. Provide your tweak header as nonstd/ring_span.tweak.hpp in a folder in the include-search-path. In the tweak header, provide definitions as documented below, like #define nsrs_CPLUSPLUS 201103L.

Standard selection macro

-Dnsrs_CPLUSPLUS=199711L
Define this macro to override the auto-detection of the supported C++ standard, if your compiler does not set the __cpluplus macro correctly.

Select std::ring_span or nonstd::ring_span

At default, ring_span lite uses std::ring_span if it is available and lets you use it via namespace nonstd. You can however override this default and explicitly request to use std::ring_span or ring_span lite's nonstd::ring_span as nonstd::ring_span via the following macros.

-Dnsrs_CONFIG_SELECT_RING_SPAN=nsrs_RING_SPAN_DEFAULT
Define this to nsrs_RING_SPAN_STD to select std::ring_span as nonstd::ring_span. Define this to nsrs_RING_SPAN_NONSTD to select nonstd::ring_span as nonstd::ring_span. Default is undefined, which has the same effect as defining to nsrs_RING_SPAN_DEFAULT.

Disable extensions

-Dnsrs_CONFIG_STRICT_P0059=0
Define this to 1 to omit behaviour not present in proposal p0059. Default is undefined (same effect as 0).

Enable popper empty base class optimization

-Dnsrs_CONFIG_POPPER_EMPTY_BASE_CLASS=0
Poppers are often stateless. To prevent they take up space C++20 attribute [[no_unique_address]] is used when available. Another way to prevent up taking space is to make the popper a base class of class ring_span. This is what occurs with macro nsrs_CONFIG_POPPER_EMPTY_BASE_CLASS defined to 1. This is an extension to proposal p0059. Disabling extensions via macro nsrs_CONFIG_STRICT_P0059 also disables this extension. Default is undefined (same effect as 0).

Enable compilation errors

-Dnsrs_CONFIG_CONFIRMS_COMPILATION_ERRORS=0
Define this to 1 to include the tests with compile-time errors. Default is undefined (same effect as 0).

Reported to work with

The table below mentions the compiler versions ring-span lite is reported to work with.

OS Compiler Versions
Windows Clang/LLVM ?
Β  GCC 5.2.0, 6.3.0
Β  Visual C++
(Visual Studio)		 8 (2005), 10 (2010), 11 (2012),
12 (2013), 14 (2015, 2017)
GNU/Linux Clang/LLVM 3.5.0
Β  GCC 4.8.4
OS X ? ?

Building the tests

To build the tests you need:

The lest test framework is included in the test folder.

Buck

To run the tests:

prompt> buck run test/

CMake

The following steps assume that the ring-span lite source code has been cloned into a directory named c:\ring-span-lite.

  1. Create a directory for the build outputs for a particular architecture.
    Here we use c:\ring-span-lite\build-win-x86-vc10.

     cd c:\ring-span-lite
 md build-win-x86-vc10
 cd build-win-x86-vc10

  2. Configure CMake to use the compiler of your choice (run cmake --help for a list).

     cmake -G "Visual Studio 10 2010" [see 3. below] ..

  3. Optional. You can control above configuration through the following options:

    • -DRING_SPAN_LITE_COLOURISE_TEST=ON: use colour for pass, fail, default off

  4. Build the test suite in the Debug configuration (alternatively use Release).

     cmake --build . --config Debug

  5. Run the test suite.

     ctest -V -C Debug

All tests should pass, indicating your platform is supported and you are ready to use ring-span lite. See the table with supported types and functions.

Other ring-span implementations

Notes and references

References

[1] p0059: A proposal to add a ring span to the standard library (latest, r4, r3, r2, r1, r0).
[2] WG21-SG14/SG14. Reference implementation of std::ring_span by Guy Davidson and Arthur O'Dwyer.
[3] Arthur O'Dwyer. Reference implementation of std::ring_span.
[4] Arthur O’Dwyer. Reference types with metadata cause problems. 30 May 2018.
[5] Phillip Johnston. Creating a Circular Buffer in C and C++. 17 May 2017.
[6] Jan Gaspar. Boost.Circular Buffer.

Appendix

Contents

A.1 Applets

Applets demonstrate a specific use case. They are available via tag [.applet].

> ring-span-main.t.exe -l .applet
ring_span: filter[.applet]

A.2 Compile-time information

The version of ring-span lite is available via tag [.version]. The following tags are available for information on the compiler and on the C++ standard library used: [.compiler], [.stdc++], [.stdlanguage] and [.stdlibrary].

A.3 Ring-span lite test specification

Note: test cases that assert are tagged with [.assert] and only run when [.assert] is included on the command line, like: test [.assert] partial-test-name.

click to expand 

ring_span: Allows to construct an empty span from an iterator pair
ring_span: Allows to construct an empty span from an iterator pair - capacity is power of 2
ring_span: Allows to construct a partially filled span from an iterator pair and iterator, size
ring_span: Allows to construct a partially filled span from an iterator pair and iterator, size - capacity is power of 2
ring_span: Disallows to copy-construct from a ring_span (compile-time)
ring_span: Disallows to copy-assign from a ring_span (compile-time)
ring_span: Allows to move-construct from a ring_span (C++11)
ring_span: Allows to move-assign from a ring_span (C++11)
ring_span: Allows to obtain the capacity of a span
ring_span: Allows to obtain the number of elements in a span (size)
ring_span: Allows to check for an empty span
ring_span: Allows to check for a full span
ring_span: Allows to observe the element at the specified index [extension]
ring_span: Allows to observe the element at the front
ring_span: Allows to observe the element at the back
ring_span: Allows to obtain and remove the element at the front
ring_span: Allows to obtain and remove the element at the back [extension]
ring_span: Allows to copy-insert an element at the front [extension]
ring_span: Allows to move-insert an element at the front (C++11) [extension]
ring_span: Allows to emplace an element at the front (C++11) [extension]
ring_span: Allows to copy-insert an element at the back
ring_span: Allows to move-insert an element at the back (C++11)
ring_span: Allows to emplace an element at the back (C++11)
ring_span: Adding an element to an empty span makes it non-empty (front) [extension]
ring_span: Adding an element to an empty span makes it non-empty (back)
ring_span: Adding an element to an empty span doesn't change its capacity (front) [extension]
ring_span: Adding an element to an empty span doesn't change its capacity (back)
ring_span: Adding an element to a full span leaves it full (front) [extension]
ring_span: Adding an element to a full span leaves it full (back)
ring_span: Adding an element to a full span doesn't change its capacity (front) [extension]
ring_span: Adding an element to a full span doesn't change its capacity (back)
ring_span: Removing an element from a span with one element makes it empty (front)
ring_span: Removing an element from a span with one element makes it empty (back) [extension]
ring_span: Removing an element from a span with one element doesn't change its capacity (front)
ring_span: Removing an element from a span with one element doesn't change its capacity (back) [extension]
ring_span: Removing an element from a full span makes it not full (front)
ring_span: Removing an element from a full span makes it not full (back) [extension]
ring_span: Removing an element from a full span doesn't change its capacity (front)
ring_span: Removing an element from a full span doesn't change its capacity (back) [extension]
ring_span: Allows to swap spans (member)
ring_span: Allows to swap spans (non-member)
ring_span: Allows to appear in range-for (C++11)
ring_span: Allows iteration (non-const)
ring_span: Allows iteration (const)
ring_span: Allows iteration (mixed const-non-const)
ring_span: Allows reverse iteration (non-const) [extension]
ring_span: Allows reverse iteration (const) [extension]
ring_span: Allows reverse iteration (mixed const-non-const) [extension]
ring_span: A span with capacity zero is both empty and full
ring_span: A full span is a delay-line of capacity elements (back-front)
ring_span: A full span is a delay-line of capacity elements (front-back) [extension]
ring_span: A non-full span is a stack of capacity elements (back) [extension]
ring_span: A non-full span is a stack of capacity elements (front) [extension]
ring_span: A non-full span behaves like an harmonica (back-front)
ring_span: A non-full span behaves like an harmonica (front-back) [extension]
ring_iterator: Allows conversion to const ring_iterator [extension]
ring_iterator: Allows to dereference iterator (operator*())
ring_iterator: Allows to dereference iterator (operator->())
ring_iterator: Allows to index from iterator (operator[](size_t))
ring_iterator: Allows to increment iterator (prefix)
ring_iterator: Allows to increment iterator (postfix)
ring_iterator: Allows to decrement iterator (prefix)
ring_iterator: Allows to decrement iterator (postfix)
ring_iterator: Allows to advance iterator (+=) [extension]
ring_iterator: Allows to advance iterator (-=) [extension]
ring_iterator: Allows to offset iterator (+) [extension]
ring_iterator: Allows to offset iterator (-) [extension]
ring_iterator: Allows to obtain difference of iterators [extension]
ring_iterator: Allows to compare iterators (==)
ring_iterator: Allows to compare iterators (!=)
ring_iterator: Allows to compare iterators (<)
ring_iterator: Allows to compare iterators (<=)
ring_iterator: Allows to compare iterators (>)
ring_iterator: Allows to compare iterators (>=)
ring_iterator: Allows to compare iterators (mixed const-non-const)
null_popper: A null popper returns void
null_popper: A null popper leaves the original element unchanged
default_popper: A default popper returns the element
default_popper: A default popper moves the element (C++11)
default_popper: A default popper leaves the original element unchanged
copy_popper: A copy popper returns the element
copy_popper: A copy popper replaces the original element
ring: Allows to create data owning ring from container
ring: Allows to create data owning ring from container - capacity is power of 2
tweak header: reads tweak header if supported [tweak]

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Slides and other materials from ACCU Conference 2016
5
star
35

array_view2d

A simple 2D view on an array or vector for C++98 and C++11
C++
5
star
36

clamp

Limit a value or a range of values to fall between two extremes
C++
4
star
37

boolean-lite

boolean lite: A strong boolean type for C++98 and later
C++
4
star
38

svn-churn

A simple Python script to determine file churn and fix count of a Subversion repository.
Python
3
star
39

active-lite

Active objects
CMake
2
star
40

clamp-proposal

Propose clamp for C++ standard
CSS
2
star
41

kalman-estimator-ada

kalman-estimator - a Kalman estimator in Ada, sibling of Kalman estimator in C++
Makefile
2
star
42

nonstd-lite-project

Stuff common to nonstd lite repositories
CMake
2
star
43

Test-Normalised

1
star
44

bibliography

My bookshelf
TeX
1
star
45

hamlest

Matchers for lest
C++
1
star
46

wordindex

wordindex: create a linenumber cross-referenced list of words
C++
1
star
47

Test-NonNormalised

1
star
48

wordindex-ranged

wordindex: create a linenumber cross-referenced list of words using C++20 std::ranges
C++
1
star
49

testdox

TestDox - generate a readable overview of test case names from the specified files.
Hack
1
star