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###### field::as_string (2 of 2 overloads)

Retrieves a reference to the underlying `std::string` value or throws an exception.

###### Synopsis

    std::string&
    as_string();

###### Exception safety

Strong guarantee. Throws on type mismatch.

###### Exceptions

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

###### Object lifetimes

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