std::ranges::view_interface<D>:: operator[]

template < ranges:: random_access_range R = D > constexpr decltype ( auto ) operator [ ] ( ranges:: range_difference_t < R > n ) ;	(1)	(since C++20)
template < ranges:: random_access_range R = const D > constexpr decltype ( auto ) operator [ ] ( ranges:: range_difference_t < R > n ) const ;	(2)	(since C++20)

The default implementation of operator [ ] member function obtains the element at the specified offset relative to the beginning iterator, reusing the operator [ ] of the iterator type.

Parameters

n

-

position of the element to return

Return value

The element at offset n relative to the beginning iterator.

Notes

In C++20, no type derived from std::ranges::view_interface in the standard library provides their own operator [ ] member function.

However, following derived types cannot use the default implementations, as they never satisfy random_access_range :

• std::ranges::basic_istream_view
• std::ranges::filter_view
• std::ranges::join_view
• std::ranges::lazy_split_view
• std::ranges::split_view

The inherited operator [ ] member function is available for std::ranges::empty_view , but a call to it always results in undefined behavior.

Example

This section is incomplete Reason: no example