std::ranges::adjacent_transform_view<V,F,N>:: iterator <Const>:: operator[]

From cppreference.com
Ranges library
Range adaptors
constexpr decltype ( auto ) operator [ ] ( difference_type n ) const
requires ranges:: random_access_range < Base > ;
(since C++23)

Returns an element at specified relative location.

Let parent_ and inner_ be the data members of the iterator . Equivalent to:

return apply([&](const auto&... iters) -> decltype(auto)
             {
                return invoke(*parent_->fun_, iters[n]...);
             },
             inner_.current_);

Parameters

n - position relative to current location

Return value

The element at displacement n relative to the current location.

Example

See also

(C++23)
accesses the element
(public member function)