#[cfg(feature = "std")]
mod std_support {
    use super::*;

    use std::borrow::Cow;

    impl ToKey for String {
        fn to_key(&self) -> Key {
            Key::from_str(self)
        }
    }

    impl<'a> ToKey for Cow<'a, str> {
        fn to_key(&self) -> Key {
            Key::from_str(self)
        }
    }
}

#[cfg(feature = "kv_std")]
mod std_support {
    use std::borrow::Cow;
    use std::rc::Rc;
    use std::sync::Arc;

    use super::*;

    impl<T> ToValue for Box<T>
    where
        T: ToValue + ?Sized,
    {
        fn to_value(&self) -> Value {
            (**self).to_value()
        }
    }

    impl<T> ToValue for Arc<T>
    where
        T: ToValue + ?Sized,
    {
        fn to_value(&self) -> Value {
            (**self).to_value()
        }
    }

    impl<T> ToValue for Rc<T>
    where
        T: ToValue + ?Sized,
    {
        fn to_value(&self) -> Value {
            (**self).to_value()
        }
    }

    impl ToValue for String {
        fn to_value(&self) -> Value {
            Value::from(&**self)
        }
    }

    impl<'v> ToValue for Cow<'v, str> {
        fn to_value(&self) -> Value {
            Value::from(&**self)
        }
    }

    impl<'v> Value<'v> {
        /// Try convert this value into a string.
        pub fn to_cow_str(&self) -> Option<Cow<'v, str>> {
            self.inner.to_str()
        }
    }

    impl<'v> From<&'v String> for Value<'v> {
        fn from(v: &'v String) -> Self {
            Value::from(&**v)
        }
    }
}