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range-v3

Range library for C++11/14/17. This code is the basis of a formal proposal to add range support to the C++ standard library.

About:

Why does C++ need another range library? Simply put, the existing solutions haven't kept up with the rapid evolution of C++. Range v3 is a library for the future C++. Not only does it work well with today's C++ -- move semantics, lambdas, automatically deduced types and all -- it also anticipates tomorrow's C++ with Concepts.

Range v3 forms the basis of a proposal to add range support to the standard library (N4128: Ranges for the Standard Library). It also will be the reference implementation for an upcoming Technical Specification. These are the first steps toward turning ranges into an international standard.

Documentation:

Check out the (woefully incomplete) documentation here.

Other resources (mind the dates, the library probably has changed since then):

License:

Most of the source code in this project are mine, and those are under the Boost Software License. Parts are taken from Alex Stepanov's Elements of Programming, Howard Hinnant's libc++, and from the SGI STL. Please see the attached LICENSE file and the CREDITS file for the licensing and acknowledgments.

Supported Compilers

The code is known to work on the following compilers:

  • clang 3.6.2 (or later)
  • GCC 4.9.1 (or later) (C++14 support requires GCC 5.2; C++14 "extended constexpr" support is poor before 6.1.)
  • Clang/LLVM 6 (or later) on Windows (older versions may work - we haven't tested.)

[ Note: We've "retired" support for Clang/C2 with the VS2015 toolset (i.e., the v140_clang_c2 toolset) which Microsoft no longer supports for C++ use. We no longer have CI runs, but haven't gone out of our way to break anything, so it will likely continue to work. ]

Development Status: This code is fairly stable, well-tested, and suitable for casual use, although currently lacking documentation. No promise is made about support or long-term stability. This code will evolve without regard to backwards compatibility.

Build status

  • on Travis-CI: Travis Build Status
  • on AppVeyor: AppVeyor Build Status

Release Notes:

  • 0.3.7 Sept 19, 2018

    • Improved support for clang-cl (thanks to @CaseyCarter).
    • Fix for any_view<T, category::sized | category::input> (see #869).
    • Fix iter_move of a ranges::reverse_iterator (see #888).
    • Fix move_sentinel comparisons (see #889).
    • Avoid ambiguity created by boost::advance and std::advance (see #893).

  • 0.3.6 May 15, 2018

    • NEW: view::exclusive_scan (thanks to GitHub user @mitsutaka-takeda).
    • All views get non-const overloads of .empty() and .size() (see ericniebler/stl2#793).
    • Upgrade Conan support for conan 1.0.
    • subspan interface tweaks.
    • Fix bug in view::split (see this stackoverflow question).
    • Fix bug in view::stride (see ericniebler/stl2#805).
    • Fix const-correctness problem in view::chunk (see this stackoverflow question).
    • Replace uses of ranges::result_of with ranges::invoke_result.
    • Fix potential buffer overrun of view::drop over RandomAccessRanges.
    • Lots of view::cartesian_product fixes (see ericniebler/stl2#820, ericniebler/stl2#823).
    • Work around gcc-8 regression regarding volatile std::initializer_lists (see ericniebler/stl2#826).
    • Fix const-correctness problem of view::take.

  • 0.3.5 February 17, 2018

    • Rvalues may satisfy Writable (see ericniebler/stl2#387).
    • view_interface gets a bounds-checking at method.
    • chunk_view works on Input ranges.
    • Fix bug in group_by_view.
    • Improved concept checks for partial_sum numeric algorithm.
    • Define ContiguousIterator concept and contiguous_iterator_tag iterator category tag.
    • Sundry span fixes.
    • action::insert avoids interfering with vector's exponentional growth strategy.
    • Add an experimental shared view for views that need container-like scratch space to do their work.
    • Faster, simpler reverse_view.
    • Rework ranges::reference_wrapper to avoid LWG#2993.
    • Reworked any_view, the type-erased view wrapper.
    • equal algorithm is constexpr in C++14.
    • stride_view no longer needs an atomic data member.
    • const-correct drop_view.
    • adjacent_filter_view supports bidirectional iteration.
    • Massive view_adaptor cleanup to remove the need for a mutable data member holding the adapted view.
    • Fix counting_iterator post-increment bug.
    • tail_view of an empty range is an empty range, not undefined behavior.
    • Various portability fixes for gcc and clang trunk.

  • 0.3.0 June 30, 2017

    • Input views may now be move-only (from @CaseyCarter)
    • Input any_views are now much more efficient (from @CaseyCarter)
    • Better support for systems lacking a working <thread> header (from @CaseyCarter)

  • 0.2.6 June 21, 2017

    • Experimental coroutines with ranges::experimental::generator (from @CaseyCarter)
    • ranges::optional now behaves like std::optional (from @CaseyCarter)
    • Extensive bug fixes with Input ranges (from @CaseyCarter)

  • 0.2.5 May 16, 2017

    • view::chunk works on Input ranges (from @CaseyCarter)
    • for_each_n algorithm (from @khlebnikov)
    • Portability fixes for MinGW, clang-3.6 and -3.7, and gcc-7; and cmake 3.0

  • 0.2.4 April 12, 2017 Fix the following bug:

    • action::stable_sort of vector broken on Clang 3.8.1 since ~last Xmas (ericniebler#632).

  • 0.2.3 April 4, 2017 Fix the following bug:

  • 0.2.2 March 30, 2017 New in this release:

    • view::linear_distribute(from,to,n) - A view of n elements between from and to, distributed evenly.
    • view::indices(n) - A view of the indices [0,1,2...n-1].
    • view::closed_indices(n) - A view of the indices [0,1,2...n].

    This release deprecates view::ints(n) as confusing to new users.

  • 0.2.1 March 22, 2017 New in this release:

    • view::cartesian_product
    • action::reverse

  • 0.2.0 March 13, 2017 Bring many interfaces into sync with the Ranges TS.

    • Many interfaces are simply renamed. The following table shows the old names and the new. (All names are in the ranges::v3 namespace.)

      Old Name New Name
      indirect_swap iter_swap
      indirect_move iter_move
      iterator_value_t value_type_t
      iterator_reference_t reference_t
      iterator_difference_t difference_type_t
      iterator_size_t size_type_t
      iterator_rvalue_reference_t rvalue_reference_t
      iterator_common_reference_t iter_common_reference_t
      range_value_t range_value_type_t
      range_difference_t range_difference_type_t
      range_size_t range_size_type_t
      range_iterator_t iterator_t
      range_sentinel_t sentinel_t

    • common_iterator now requires that its two types (Iterator and Sentinel) are different. Use common_iterator_t<I, S> to get the old behavior (i.e., if the two types are the same, it is an alias for I; otherwise, it is common_iterator<I, S>).

    • The following iterator adaptors now work with iterators that return proxies from their postfix increment operator (i.e., operator++(int)):

      • common_iterator
      • counted_iterator

    • The following customization points are now implemented per the Ranges TS spec and will no longer find the associated unconstrained overload in namespace std:::

      • ranges::begin
      • ranges::end
      • ranges::size
      • ranges::swap
      • ranges::iter_swap

      (In practice, this has very little effect but it may effect overloading in rare situations.)

    • ranges::is_swappable now only takes one template parameter. The new ranges::is_swappable_with<T, U> tests whether T and U are swappable. ranges::is_swappable<T> is equivalent to ranges::is_swappable_with<T &, T &>.

    • The following object concepts have changed to conform with the Ranges TS specification, and approved changes (see P0547):

      • Destructible
      • Constructible
      • DefaultConstructible
      • MoveConstructible
      • MoveConstructible
      • Movable
      • Assignable

    • The View concept is no longer satisfied by reference types.

    • The syntax for defining a concept has changed slightly. See utility/iterator_concepts.hpp for examples.

  • 0.1.1 Small tweak to Writable concept to fix #537.

  • 0.1.0 March 8, 2017, Begin semantic versioning

Say Thanks!

I do this work because I love it and because I love C++ and want it to be as excellent as I know it can be. If you like my work and are looking for a way to say thank you, you can leave a supportive comment on my blog. Or you could leave me some kudos on my Open Hub range-v3 contribution page. Just click the Give Kudos button here.