is_empty 0.3.0

Easily check if the struct is empty.
Documentation 
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use super::*;

use std::collections::*;

impl IsEmpty for std::ffi::OsString {
    fn is_empty(&self) -> bool {
        let os_str = self as &std::ffi::OsStr;
        os_str.is_empty()
    }
}

macro_rules! impl_simple {
    ($($t:ty),+) => {

    $(
    impl IsEmpty for $t{
        fn is_empty(&self) -> bool {
            self.is_empty()
        }
    }
    )+

    };
}

impl_simple!(str, String, std::ffi::OsStr);

macro_rules! impl_generic_one{

    ($($t:ty),+) => {

    $(
    impl<K> IsEmpty for $t {
        fn is_empty(&self) -> bool {
            self.is_empty()
        }
    }
    )+
    };
}

impl_generic_one!(BTreeSet<K>, HashSet<K>, LinkedList<K>, VecDeque<K>, Vec<K>);

macro_rules! impl_generic_two{

    ($($t:ty),+) => {

    $(
    impl<K, V> IsEmpty for $t {
        fn is_empty(&self) -> bool {
            self.is_empty()
        }
    }
    )+
    };
}

impl_generic_two!(BTreeMap<K,V>, HashMap<K,V>);