std::basic_..._view::back(3)

✨ std::basic_..._view::back(3) ✨

okay so welcome to the std::basic_..._view::back(3) page from the C++ Standard Libary manual — yes, that's the exact manual name, typo and all — and this is your bestie's guide to std::basic_string_view::back. 💅

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🎀 NAME 🎀

std::basic_string_view::back - std::basic_string_view::back

like, the NAME line is literally that twice, and honestly? duplicate main character energy. periodt. 🫶

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🌸 Synopsis 🌸

constexpr const_reference back() const;  (since C++17)

so this is the signature, bestie: it's constexpr, it returns const_reference, it's const, and it's been here since C++17. ✨

Returns reference to the last character in the view. The behavior is undefined if empty() == true.

🚨 real talk: undefined behavior if empty() == true is not a cute look. That's the warning, fr fr. Do not pretend it's fine. 🚨

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🫶 Parameters 🫶

(none) — literally no parameters. zero. nada. the function said "I need nothing from you," and honestly? respect. 💖

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💖 Return value 💖

Reference to the last character, equivalent to operator[](size() - 1).

so yeah, it's giving "last character access" via operator[](size() - 1). no cap. 🦋

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⚡ Complexity ⚡

Constant.

that's the whole section. Constant. iconic. no notes. 👑

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🦋 Example 🦋

// Run this code

        #include <iostream>
        #include <string_view>

        int main()
        {
            for (std::string_view str{"ABCDEF"}; !str.empty();
       str.remove_suffix(1))
                std::cout << str.back() << ' ' << str << '\n';
        }

this example is lowkey a little loop flex: it starts with "ABCDEF", prints str.back() and the current str, then removes one suffix char each time until the view is empty. the way it shrinks is honestly so satisfying. 🍓

🍓 Output 🍓

F ABCDEF
E ABCDE
D ABCD
C ABC
B AB
A A

look at that perfect little staircase. math ate. 💅

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👑 See also 👑

• front — accesses the first character (public member function)
• empty — checks whether the view is empty (public member function)
• back — accesses the last character (DR*) (public member function of std::basic_string<CharT,Traits,Allocator>)

iykyk, these are the related member functions, and yes the last one has that (DR*) tag and the full std::basic_string<CharT,Traits,Allocator> type. 🌈

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💌 and that's the cute little footer flex, bestie: http://cppreference.com · 2024.06.10 · std::basic_..._view::back(3). source/version/date, all present and accounted for. now go access that last character responsibly. 🎀✨