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

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C++
Ranges library
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std::ranges::zip_transform_view
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zip_transform_view:: iterator ::operator[]
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constexpr decltype ( auto ) operator [ ] ( difference_type n ) const
requires ranges:: random_access_range < Base > ;
(since C++23)

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... .

Contents

Parameters

n - position relative to current location.

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

This section is incomplete
Reason: no example