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##### any_address::hostname

Retrieves the hostname that this object contains.

###### Synopsis

    string_view
    hostname() const noexcept;

###### Preconditions

`this->type() == address_type::host_and_port`

###### Object lifetimes

The returned view points into `*this`, and is valid as long as `*this` is alive and hasn't been assigned to or moved from.

###### Exception safety

No-throw guarantee.