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###### field::as_datetime (1 of 2 overloads)

Retrieves a reference to the underlying `datetime` value or throws an exception.

###### Synopsis

    const datetime&
    as_datetime() const;

###### Exception safety

Strong guarantee. Throws on type mismatch.

###### Exceptions

Type | Thrown On
--- | ---
`bad_field_access` | If `!this->is_datetime()`

###### Object lifetimes

The returned reference is valid as long as `*this` is alive and no function that invalidates references is called on `*this`.