Docs4dev
Docs
cpp / latest / ranges / transform_view / begin.html

std::ranges::transform_view<V,F>::begin

constexpr /*iterator*/<false> begin();
 (1) (since C++20) 
constexpr /*iterator*/<true> begin() const
  requires ranges::range<const V> &&
           std::regular_invocable<const F&, ranges::range_reference_t<const V>>;
 (2) (since C++20)

Returns an iterator to the first element of the transform_view.

1) Equivalent to return /*iterator*/<false>{*this, ranges::begin(base_)};, where base_ is the underlying view.
2) Equivalent to return /*iterator*/<true>{*this, ranges::begin(base_)};, where base_ is the underlying view.

Parameters

(none)

Return value

Iterator to the first element.

Example

See also

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

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/ranges/transform_view/begin