std::experi...last_not_of(3)

💅 std::experimental::basic_string_view::find_last_not_of

okay bestie, buckle up — this one's from the C++ Standard Library section, and the page you're on is std::experi...last_not_of(3) (yes the header truncates it, that's just how it's filed, we don't make the rules). It's a member of std::experimental::basic_string_view, and it's giving "find me the last character that is not in this club" energy. Let's go 🦋

---

✨ SYNOPSIS ✨

All four of these are library fundamentals TS — like, they're the experimental ones, iykyk 🧪

constexpr size_type
find_last_not_of(basic_string_view v, size_type pos = npos) const noexcept;   // (1)

constexpr size_type
find_last_not_of(CharT c, size_type pos = npos) const noexcept;               // (2)

constexpr size_type
find_last_not_of(const CharT* s, size_type pos, size_type count) const;       // (3)

constexpr size_type
find_last_not_of(const CharT* s, size_type pos = npos) const;                 // (4)

quick vibe check: (1) and (2) are noexcept — (3) and (4) are not. noted. 🫶

---

🔍 WHAT IT DOES 🔍

Finds the last character not equal to any of the characters in the given character sequence. Basically: "walk backwards till you find someone who isn't on the list, bestie." 🎀

Here's the breakdown, overload by overload:

1. Finds the last character not equal to any of the characters of v in this view, starting at position pos.
2. Equivalent to find_last_not_of(basic_string_view(&c, 1), pos).
3. Equivalent to find_last_not_of(basic_string_view(s, count), pos).
4. Equivalent to find_last_not_of(basic_string_view(s), pos).

literally a family of four little icons doing the exact same quest with different starting gear 💅

---

🌸 PARAMETERS 🌸

• v — view to search for
• pos — position at which to start the search
• count — length of the string of characters to compare
• s — pointer to a string of characters to compare
• ch — character to compare

(yeah the parameter list says ch and the synopsis says CharT c — that's the manpage being its authentic self, don't come for me 😭)

---

⭐ RETURN VALUE ⭐

Position of the last character not equal to any of the characters in the given string, or npos if no such character is found.

🚨 translation: if every character is on the list and nobody's an outsider, you get npos. that's the "no thoughts, head empty, not found" result, bestie.

---

🔥 COMPLEXITY 🔥

O(size() * v.size()) at worst.

so like… the worst case is doing the whole comparison thing for every position. it's not the speediest icon at the party but she gets there 💀

---

👑 SEE ALSO 👑

• find — find characters in the view (public member function)
• rfind — find the last occurrence of a substring (public member function)
• find_first_of — find first occurrence of characters (public member function)
• find_last_of — find last occurrence of characters (public member function)
• find_first_not_of — find first absence of characters (public member function)

the whole find family is iconic, honestly 🌈

---

📌 Category

• Noindexed pages

(that's it. that's the category. no note added. we respect the metadata.) 🙈

---

and that's the whole page, bestie — every overload, every parameter, every default, nothing skipped, periodt 💖

source/version + date, as promised: this came from http://cppreference.com, dated 2024.06.10. go drink some water and go find your last-not-of character, you absolute main character 🌟