std::ranges::adjacent_transform_view<V,F,N>::size

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Ranges library

Range access
begin cbegin end cend	rbegin crbegin rend crend	size ssize data cdata	empty
Range conversions
to (C++23)
Range primitives
range_size_trange_difference_trange_value_trange_reference_t	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (C++23)(C++23)	range_const_reference_trange_rvalue_reference_trange_common_reference_t (C++23)	elements_of (C++23)
Dangling iterator handling
dangling	borrowed_iterator_t	borrowed_subrange_t
Range concepts
range borrowed_range sized_range constant_range (C++23)	common_range view viewable_range	input_range output_range forward_range	bidirectional_range random_access_range contiguous_range
Views
view_interface	subrange
Range factories
empty_viewviews::empty single_viewviews::single	iota_viewviews::iota repeat_viewviews::repeat (C++23)(C++23)	basic_istream_viewviews::istream
Range adaptors
views::all_tviews::all ref_view owning_view as_rvalue_viewviews::as_rvalue (C++23)(C++23) filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while	drop_viewviews::drop drop_while_viewviews::drop_while join_viewviews::join join_with_viewviews::join_with (C++23)(C++23) lazy_split_viewviews::lazy_split split_viewviews::split views::counted common_viewviews::common	reverse_viewviews::reverse as_const_viewviews::as_const (C++23)(C++23) elements_viewviews::elements keys_viewviews::keys values_viewviews::values enumerate_viewviews::enumerate (C++23)(C++23) zip_viewviews::zip (C++23)(C++23) zip_transform_viewviews::zip_transform (C++23)(C++23)	adjacent_viewviews::adjacent (C++23)(C++23) views::pairwise (C++23) adjacent_transform_viewviews::adjacent_transform (C++23)(C++23) views::pairwise_transform (C++23) chunk_viewviews::chunk (C++23)(C++23) slide_viewviews::slide (C++23)(C++23) chunk_by_viewviews::chunk_by (C++23)(C++23) stride_viewviews::stride (C++23)(C++23) cartesian_product_viewviews::cartesian_product (C++23)(C++23)
Range generators
std::generator (C++23)
Range adaptor objects
Range adaptor closure objects
range_adaptor_closure (C++23)
Helper items
copyable-box movable-box (until C++23)(C++23)	simple-view non-propagating-cache

 

std::ranges::adjacent_transform_view

Member functions

adjacent_transform_view::adjacent_transform_view (C++23)

adjacent_transform_view::begin (C++23)

adjacent_transform_view::end (C++23)

adjacent_transform_view::size (C++23)

Iterator

Member functions

adjacent_transform_view::iterator::iterator (C++23)

adjacent_transform_view::iterator::operator* (C++23)

adjacent_transform_view::iterator::operator[] (C++23)

adjacent_transform_view::iterator::operator++ adjacent_transform_view::iterator::operator++(int) adjacent_transform_view::iterator::operator-- adjacent_transform_view::iterator::operator--(int) adjacent_transform_view::iterator::operator+= adjacent_transform_view::iterator::operator-= (C++23)(C++23)(C++23)(C++23)(C++23)(C++23)

Non-member functions

operator==(adjacent_transform_view::iterator) operator<(adjacent_transform_view::iterator) operator>(adjacent_transform_view::iterator) operator<=(adjacent_transform_view::iterator) operator>=(adjacent_transform_view::iterator) operator<=>(adjacent_transform_view::iterator) (C++23)(C++23)(C++23)(C++23)(C++23)(C++23)

operator+(adjacent_transform_view::iterator) operator-(adjacent_transform_view::iterator) (C++23)(C++23)

Sentinel

Member functions

adjacent_transform_view::sentinel::sentinel (C++23)

Non-member functions

operator==(adjacent_transform_view::iterator,adjacent_transform_view::sentinel) (C++23)

operator-(adjacent_transform_view::iterator,adjacent_transform_view::sentinel) (C++23)

 

constexpr auto size() requires ranges::sized_range<InnerView>;		(since C++23)
constexpr auto size() const requires ranges::sized_range<const InnerView>;		(since C++23)

Returns the number of elements.

Let inner_ be the underlying object of type InnerView (that is the ranges::adjacent_view<V,N>).

1,2) Equivalent to return inner_.size();.

Parameters

(none)

Return value

The number of elements, may be ​0​ if the size of the underlying view V is less than N.

Example

A link to test: Compiler Explorer/g++-13

Run this code

#include <ranges>
 
int main()
{
    constexpr static auto v = {1, 2, 3, 4, 5, 6};
 
    auto f = [](auto...) { return 0; }; // dummy
 
    constexpr int width1 {4};
    constexpr auto view1 = v | std::views::adjacent_transform<width1>(f);
    static_assert(view1.size() == 3);
    static_assert(view1.size() == (v.size() - width1 + 1));
 
    constexpr int width2 {8};
    constexpr auto view2 = v | std::views::adjacent_transform<width2>(f);
    // window is too wide, so view2 has no elements:
    static_assert(view2.size() == 0);
}

See also

ranges::size (C++20)	returns an integer equal to the size of a range (customization point object)
ranges::ssize (C++20)	returns a signed integer equal to the size of a range (customization point object)