NAME¶

std::ranges::adjacent_transform_view::begin - std::ranges::adjacent_transform_view::begin

Synopsis¶

constexpr auto begin(); (1) (since C++23)
constexpr auto begin() const

requires ranges::range<const InnerView> && (2) (since C++23)
std::regular_invocable<const F&,

__REPEAT(ranges::range_reference_t<const V>, N)...>;

Returns an iterator to the first element of the adjacent_transform_view.

Let inner_ be the underlying ranges::adjacent_view.

1) Equivalent to return /*iterator*/<false>(*this, inner_.begin());.
2) Equivalent to return /*iterator*/<true>(*this, inner_.begin());.

Parameters¶

(none)

Return value¶

Iterator to the first element.

Example¶

// Run this code

#include <ranges>

int main()
{
auto sum = [](auto... args) { return (... + args); };

constexpr auto view = std::views::iota(13, 1337)
| std::views::adjacent_transform<3>(sum);

static_assert(*view.begin() == 42 and 42 == 13 + 14 + 15);
}

See also¶

end returns an iterator or a sentinel to the end
(C++23) (public member function)
ranges::begin returns an iterator to the beginning of a range
(C++20) (customization point object)