STD::RANGES::EMPTY_VIEW(3)

✨ std::ranges::empty_view< _Tp > ✨

okay bestie so we're in the Library Functions Manual today and the vibe is deliberately nothing 💅 no cap, this whole page is about a view that is empty on purpose. it's giving minimalist icon behavior 🎀

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🌸 NAME 🌸

std::ranges::empty_view< _Tp > — a view that contains no elements. that's it. that's the whole girl. she is empty and she is thriving ✨

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🦋 SYNOPSIS 🦋

#include <ranges>

she inherits from std::ranges::view_interface< empty_view< _Tp > >, so all that base-class energy comes along for the ride 🫶

💖 Public Member Functions

• constexpr decltype(auto) back () — yep she's got a back(), bestie
• constexpr auto cbegin () — const begin, as one does
• constexpr auto cend () — const end, matching set
• constexpr decltype(auto) front () — and a front() too, main character behavior
• constexpr operator bool () — converts to bool, and it's declared noexcept(noexcept(ranges::empty(_M_derived()))) — the noexcept is conditional on whether ranges::empty(_M_derived()) is noexcept, so it's literally inheriting the no-throw vibe from the underlying check 🔥
• constexpr decltype(auto) operator[] (range_difference_t< _Range > __n) — subscript operator, takes a range_difference_t< _Range > __n 🍓

🌈 Static Public Member Functions

these are static constexpr, so you can call them without an instance — iconic, lowkey unbothered 👑

• static constexpr _Tp * begin () noexcept
• static constexpr _Tp * data () noexcept
• static constexpr bool empty () noexcept
• static constexpr _Tp * end () noexcept
• static constexpr size_t size () noexcept

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👑 Detailed Description 👑

the actual declaration, verbatim, no edits from me:

template<typename _Tp>
    requires is_object_v<_Tp>
    class std::ranges::empty_view< _Tp >"A view that contains no elements.

so she's a class template over _Tp, constrained by requires is_object_v<_Tp> — meaning _Tp has to be an object type or she simply will not participate, periodt 💀

and yes, bestie, that stray " and the trailing description text inside the code block? that's exactly how it shows up in the source. I'm not fixing it, I'm not touching it, we preserve the artifact as-is 🫶 not me being a responsible documentarian.

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💜 Author 💜

Generated automatically by Doxygen for libstdc++ from the source code. so like, no human author to stan, just the machine doing its thing 🤖✨

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and that's the whole page, bestie — big kisses from the libstdc++ girlies, this is std::range...iew< _Tp >(3) signing off 🎀💖 (no date on the tin, so take the version as given, iykyk)