std::ranges::zip_transform_view<F,Views...>::iterator<Const>::operator[]

constexpr decltype(auto) operator[]( difference_type n ) const
    requires ranges::random_access_range<Base>;

Returns the element at specified relative location, after transformation.

Equivalent to.

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

where *parent_->fun_ is the transformation function of type F stored in the parent ranges::zip_transform_view, and current_ is the underlying tuple of iterators into Views....

Parameters

Return value

The element which is the result of transformation (mapping).

Notes

The behavior is undefined if the parent_ pointer to parent ranges::zip_transform_view is null (e.g. if *this is default constructed).

Example