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

💖 std::ranges...++,--,+=,-=(3) 💖

okay bestie, welcome to the C++ Standard Libary manual page for std::ranges::enumerate_view::iterator::operator++,--,+=,-=. Yes, the title is a whole keyboard smash and we are obsessed. This page is literally about std::ranges::enumerate_view::iterator::operator++,--,+=,-=. Slay.

💖 NAME 💖

• std::ranges::enumerate_view::iterator::operator++,--,+=,-= — the full NAME entry is this exact gorgeous mouthful, and the description line is the same exact gorgeous mouthful: std::ranges::enumerate_view::iterator::operator++,--,+=,-=. No notes. 👑

🌸 Synopsis 🌸

Here's the numbered cast, all since C++23, bestie:

constexpr /*iterator*/& operator++();                   (1) (since C++23)
constexpr void operator++( int );                       (2) (since C++23)
constexpr /*iterator*/ operator++( int )                (3) (since C++23)
  requires ranges::forward_range<Base>;
constexpr /*iterator*/& operator--()                    (4) (since C++23)
  requires ranges::bidirectional_range<Base>;
constexpr /*iterator*/ operator--( int )                (5) (since C++23)
  requires ranges::bidirectional_range<Base>;
constexpr /*iterator*/& operator+=( difference_type n ) (6) (since C++23)
  requires ranges::random_access_range<Base>;
constexpr /*iterator*/& operator-=( difference_type n ) (7) (since C++23)
  requires ranges::random_access_range<Base>;

Increments or decrements the iterator. That's the whole job, and it ate. 💅

Tiny vocab check: current_ is the underlying iterator, and pos_ is the underlying index. Now the receipts:

• (1) Equivalent to ++current_; ++pos_; return *this;
• (2) Equivalent to ++current_;
• (3) Equivalent to auto tmp = *this; ++*this; return tmp;
• (4) Equivalent to --current_; --pos_; return *this;
• (5) Equivalent to auto tmp = *this; --*this; return tmp;
• (6) Equivalent to current_ += n; pos_ += n; return *this;
• (7) Equivalent to current_ -= n; pos_ -= n; return *this;

🎀 Parameters 🎀

• n — position relative to current location. That's the parameter, bestie. 🫶

✨ Return value ✨

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

🦋 See also 🦋

• operator+ performs iterator arithmetic
• operator- (function) — (C++23)

and that's the page, bestie 💅 source/version + date from the footer: http://cppreference.com · 2024.06.10. periodt. 💖