# std::ranges::lazy_split_view<V,Pattern>::begin

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< cpp‎ | ranges‎ | lazy split view

constexpr auto begin(); | (1) | (since C++20)
constexpr auto begin() const requires ranges::forward_range <V> && ranges::forward_range <const V>; | (2) | (since C++20)

Returns an `outer_iterator` to the first element of the `lazy_split_view`.

Let `base_` be the underlying view and `current_` be the underlying caching object (may not be present).

1) Equivalent to

    constexpr auto begin()
    {
        if constexpr (ranges::forward_range<V>)
            return /*outer_iterator*/</*simple_view*/<V>>{*this, ranges::begin(base_)};
        else
        {
            current_ = ranges::begin(base_);
            return /*outer_iterator*/<false>{*this};
        }
    }

2) Equivalent to return /*outer_iterator*/<true>{*this, ranges::begin (base_)};.

### Return value

`outer_iterator` to the first element.

### Example

| This section is incomplete Reason: no example

### See also

end | returns an iterator or a sentinel to the end (public member function)
ranges::begin (C++20) | returns an iterator to the beginning of a range (customization point object)

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