std::ranges...++,--,+=,-=(3)

🦋 NAME 🦋

okay so bestie, welcome to the manual page for std::ranges...++,--,+=,-=(3) from the C++ Standard Libary manual 💅✨ and the NAME is literally std::ranges::zip_view::iterator::operator++,--,+=,-= — yes, and then it says std::ranges::zip_view::iterator::operator++,--,+=,-= again, because one extremely long name clearly wasn’t enough 💀.

✨ Synopsis ✨

here’s the whole synopsis, no cap — every single one of these is constexpr and every single one is (since C++23) 🎀:

constexpr /*iterator*/& operator++();                   (1) (since C++23)
constexpr void operator++( int );                       (2) (since C++23)
constexpr /*iterator*/ operator++( int )                (3) (since C++23)
  requires /*all-forward*/<Const, Views...>;
constexpr /*iterator*/& operator--()                    (4) (since C++23)
  requires /*all-bidirectional*/<Const, Views...>;
constexpr /*iterator*/ operator--( int )                (5) (since C++23)
  requires /*all-bidirectional*/<Const, Views...>;
constexpr /*iterator*/& operator+=( difference_type n ) (6) (since C++23)
  requires /*all-random-access*/<Const, Views...>;
constexpr /*iterator*/& operator-=( difference_type n ) (7) (since C++23)
  requires /*all-random-access*/<Const, Views...>;

The vibe check: it increments or decrements each of the underlying is_... iterators in the underlying tuple-like object current_ 🌀.

• (1) — equivalent to /*tuple-for-each*/([](auto& i) { ++i; }, current_); return *this;
• (2) — equivalent to ++*this;
• (3) — equivalent to auto tmp = *this; ++*this; return tmp;
• (4) — equivalent to /*tuple-for-each*/([](auto& i) { --i; }, current_); return *this;
• (5) — equivalent to auto tmp = *this; --*this; return tmp;
• (6) — equivalent to /*tuple-for-each*/([&]<class I>(I& i) { i += iter_difference_t<I>(x); }, current_); return *this;
• (7) — equivalent to /*tuple-for-each*/([&]<class I>(I& i) { i -= iter_difference_t<I>(x); }, current_); return *this;

💖 Parameters 💖

• n — position relative to current location ✨

🎀 Return value 🎀

• (1), (4), (6), (7) — *this
• (2) — (none)
• (3), (5) — a copy of *this that was made before the change 🫶

🌸 Example 🌸

This section is incomplete 🫠

Reason: no example

💅 Category 💅

• Todo no example

byeee bestie 💖 this page is from http://cppreference.com, version/date 2024.06.10, and the footer tag is std::ranges...++,--,+=,-=(3) 🦋✨