cheapclone 0.1.0

Mark a type, whose clone operation is cheap.
Documentation 
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use crate::CheapClone;

impl<T> CheapClone for std::rc::Rc<T> {
    fn cheap_clone(&self) -> Self {
        std::rc::Rc::clone(self)
    }
}
macro_rules! impl_copy {
    ( $($t:ty),* ) => {
        $(
            impl CheapClone for $t {
                fn cheap_clone(&self) -> Self
                {
                    *self
                }
            }
        ) *
    }
}

impl_copy!(
    (),
    bool,
    u8, u16, u32, u64, u128, usize,
    i8, i16, i32, i64, i128, isize,
    f32, f64
);

impl<T: CheapClone> CheapClone for Option<T> {
    fn cheap_clone(&self) -> Self {
        self.as_ref().map(|v| v.cheap_clone())
    }
}