C++ Ranges::iterator_t, safe_iterator_t, safe_subrange_t Introduction














































C++ Ranges::iterator_t, safe_iterator_t, safe_subrange_t Introduction



In this series of articles on RANGES with C++, today we are going to see libraries of std::ranges::iterator_t, std::ranges::safe_iterator_t, std::ranges::safe_subrange_t
____________________________________________________________________________________

INTRODUCTION to RANGES LIBRARY HAS BEEN DONE IN MY FIRST ARTICLE OF RANGES LIBRARY

All the libraries defined below are included in the header <ranges> and <iterator>.


std::ranges::iterator_t


It is used to obtain the iterator of type t (t is a type that can be used in std::ranges::begin)



 template <class t>
 using iterator_t = decltype(ranges::begin(declval<t&>()));


std::ranges::safe_iterator_t


It returns the iterator type of R wrapped in Dangling(described in my previous articles) if the range was an rvalue range

They are used by range algorithms that accept rvalue ranges and return iterators into them.

IN OTHER WORDS,

It is same as iterator_t when R models exposition-only concept Forwarding_Range, otherwise yields ranges::Dangling instead.
template<Range R>
using safe_iterator_t = std::conditional_t<__ForwardingRange<R>,
    ranges::iterator_t<R>, ranges::dangling>;

std::ranges::safe_subrange_t
Same as the safe_iterator_t, but it yields a specialization of ranges::subrange.
  template<Range R>
using safe_subrange_t = std::conditional_t<__ForwardingRange<R>,
    ranges::subrange<ranges::iterator_t<R>>, ranges::dangling>;

Thank you.





More Articles of Harshit Jain:

Name Views Likes
C++ Ranges::all_view, begin, cbegin Introduction 455 1
C++ future library Intorduction 576 1
C++ Ranges :: ViewableRange, ref_view, reverse_view 536 1
Threads Stop_token library C++ 593 1
C++ cfenv(Numerics Library) Introduction 424 1
YAML CPP Introduction 3600 1
Thead Library C++ Introduction 387 1
Introduction to gSOAP library 554 1
C++ ranges::ForwardRange, InputRange, OutputRange Introduction 566 1
Shared Mutex C++ Introduction 2038 1
SEMAPHORE HEADER C++(MULTI_THREADING) Introduction 1740 1
C++ Ranges::dangling, sized_range, disable_sized range Introduction 358 1
C++ Ranges::views::empty, filter, reverse, iota and Ranges::iota_view Introduction 593 1
MyCSS ( a CSS parser ) Introduction 371 1
C++ ranges::view::VIEW, ALL, COUNTED Introductiion 434 1
Mutex Locks C++ Multithreading Introduction 596 1
C++ Ranges:: Range, RandomAccessRange Introduction 359 1
Condition Variable(Multithreading) C++ Introduction 1725 1
Cpp - toml++ introduction 418 1
C++ Ranges::iterator_t, safe_iterator_t, safe_subrange_t Introduction 279 1
C++ Ranges::empty_view , enable_view, filter_view Introduction 463 1
C++ Barriers(Multithreading) Introduction 2321 1
LATCHES C++ Introduction 791 1
C++ Ranges::bidirectional_range, commom_range, contiguous range Introduction 360 1
C++ ZeroMQ - Introduction 1843 1
C++ BIT Library Introduction 375 1

Comments