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  • BSI
    PD ISO/IEC TS 21425:2017 Programming languages. C++ Extensions for ranges
    Edition: 2018
    $569.57
    / user per year

Description of PD ISO/IEC TS 21425:2017 2018

[intro.scope]

This document describes extensions to the C++ Programming Language (2) that permit operations on ranges of data. These extensions include changes and additions to the existing library facilities as well as the extension of one core language facility. In particular, changes and extensions to the Standard Library include:

  • The formulation of the foundational and iterator concept requirements using the syntax of the Concepts TS (2 ).

  • Analogues of the Standard Library algorithms specified in terms of the new concepts.

  • The loosening of the algorithm constraints to permit the use of sentinels to denote the end of a range and corresponding changes to algorithm return types where necessary.

  • The addition of new concepts describing range and view abstractions; that is, objects with a begin iterator and an end sentinel.

  • New algorithm overloads that take range objects.

  • Support of callable objects (as opposed to function objects) passed as arguments to the algorithms.

  • The addition of optional projection arguments to the algorithms to permit on-the-fly data transformations.

  • Analogues of the iterator primitives and new primitives in support of the addition of sentinels to the library.

  • Constrained analogues of the standard iterator adaptors and stream iterators that satisfy the new iterator concepts.

  • New iterator adaptors (counted_iterator and common_iterator) and sentinels (unreachable).

Changes to the core language include:

  • the extension of the range-based for statement to support the new iterator range requirements (10.4).

This document does not specify constrained analogues of other parts of the Standard Library (e.g., the numeric algorithms), nor does it add range support to all the places that could benefit from it (e.g., the containers).

This document does not specify any new range views, actions, or facade or adaptor utilities; all are left as future work.



Standard NumberPD ISO/IEC TS 21425:2017
TitleProgramming languages. C++ Extensions for ranges
StatusUnder Review
Publication Date2018-04-30
Identical National Standard OfISO/IEC TS 21425:2017
DescriptorsInformation technology, Code extensions, Languages, Programming Language 1
ICS35.060 Languages used in information technology
CommitteeIST/5
ISBN978 0 580 52141 6
PublisherBSI
Pages166

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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