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##### results::empty

Returns whether the collection contains any resultset.

###### Synopsis

    bool
    empty() const noexcept;

###### Description

This function is provided for compatibility with standard collections, and always returns false, since any valid `results` contains at least one resultset.

###### Preconditions

`this->has_value() == true`

###### Exception safety

No-throw guarantee.

###### Complexity

Constant.