ideal 0.7.4

When you need some ids.
Documentation 
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use super::Id;

pub struct OptionId<T> {
    id: Id<T>,
}

impl<T> From<Option<Id<T>>> for OptionId<T> {
    fn from(id: Option<Id<T>>) -> Self {
        if let Some(id) = id {
            OptionId { id }
        } else {
            OptionId { id: Id::invalid() }
        }
    }
}

impl<T> Into<Option<Id<T>>> for OptionId<T> {
    fn into(self) -> Option<Id<T>> {
        if self.id.is_valid() {
            Some(self.id)
        } else {
            None
        }
    }
}