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##### resultset_view::meta

Returns metadata for this resultset.

###### Synopsis

    metadata_collection_view
    meta() const noexcept;

###### Preconditions

`this->has_value() == true`

###### Exception safety

No-throw guarantee.

###### Object lifetimes

The returned reference and any other references obtained from it are valid as long as the object that `*this` points to is alive.

###### Complexity

Constant.