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

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Ranges library
Range access
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(C++23)

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(until C++23)(C++23)


 
 
constexpr decltype(auto) operator*() const
    noexcept(/* see description */);
(since C++23)

Returns the transformed element obtained by application of the invocable object of type F to the underlying poined-to elements.

Equivalent to

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

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

Contents

[edit] Parameters

(none)

[edit] Return value

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

[edit] Exceptions

noexcept specification:  
noexcept(std::invoke(*parent_->fun_, *std::get<INTS>(inner_.current_)...))
where INTS is the pack of integers 0, 1, ..., (sizeof...(Views)-1).

[edit] Notes

operator-> is not provided.

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

[edit] Example