Function is_empty::is_option_really_empty

pub fn is_option_really_empty<T>(t: &Option<T>) -> boolwhere
    T: IsEmpty,

Check if the Option<T> is really empty.

is_empty returns false for Some(T), even if T is empty. This function inspects the struct wrapped inside Option::Some<T>, and returns true if it is empty. (Of course, it returns true for None.)

This function can be used in two ways:

• in a #[is_empty(if = "is_empty::is_option_really_empty")] attribute,
• in a #[serde(skip_serializing_if = "is_empty::is_option_really_empty")] attribute.