std::ranges...le_view::end(3)

💅 std::ranges...le_view::end(3) — C++ Standard Libary 💅

okay bestie, this is the end() page for take_while_view, and no cap it’s shorter than it looks — but every little constraint matters, so here we go 🫶

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🌸 NAME 🌸

std::ranges::take_while_view::end — std::ranges::take_while_view::end

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✨ Synopsis ✨

here’s the exact synopsis vibe, both overloads since C++20:

          constexpr auto end() requires (!__SimpleView<V>);
       (1) (since C++20)
          constexpr auto end() const requires

              ranges::range<const V> &&
       (2) (since C++20)

              std::indirect_unary_predicate<const Pred,
          ranges::iterator_t<const V>>;

it returns a sentinel representing the end of the view 💖

let base_ denote the underlying view. so like:

1. overload (1) effectively returns /*sentinel*/<false>(ranges::end(base_), std::addressof(pred())).
2. overload (2) effectively returns /*sentinel*/<true>(ranges::end(base_), std::addressof(pred())).

⚠️ and listen: overload (1) does not participate in overload resolution if V is a simple view — that is, if V and const V are views with the same iterator and sentinel types. that constraint is iconic, don’t ignore it 💅

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🎀 Parameters 🎀

none. zero. zilch. 🫶

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💖 Return value 💖

a sentinel representing the end of the view. periodt. ✨

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🦋 Example 🦋

This section is incomplete.

Reason: no example.

so yeah, no example here — the source literally says that 🙈

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🌈 Defect reports 🌈

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

• DR: LWG 3450
• Applied to: C++20
• Behavior as published: the const overload might return a sentinel constrained non-comparable to the iterator
• Correct behavior: (none shown separately in the source text)

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👑 See also 👑

• begin — returns an iterator to the beginning (C++20) (public member function)
• operator== — compares a sentinel with an iterator returned from take_while_view::begin (C++20) (function)

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🍓 Category 🍓

• Todo no example

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made with 💖 from http://cppreference.com, dated 2024.06.10, for std::ranges...le_view::end(3) — bye bestie, go read the constraints again 👋✨