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/// For implementing the [`TransparentNewtype`] trait,
/// to cast between a field and `Self`.
///
/// # Example
///
/// ```rust
/// use core_extensions::{TransparentNewtype, TransparentNewtypeExt, impl_transparent_newtype};
///
/// use std::cmp::{Ordering, Ord, PartialOrd};
///
/// #[repr(transparent)]
/// #[derive(PartialEq, Eq)]
/// struct Reverse<T: ?Sized>(T);
///
/// unsafe impl<T: ?Sized> TransparentNewtype for Reverse<T> {
///     type Inner = T;
///     
///     // The argument must be `Self`
///     // (it could also be Reverse<T> in here, it's just easier to always write Self)
///     impl_transparent_newtype!{Self}
/// }
///
/// /* PartialOrd an Ord impls for Reverse */
///
/// let mut list = vec![3, 13, 21, 5, 8, 34];
///     
/// <[Reverse<u64>]>::from_inner_mut(&mut list).sort();
///
/// assert_eq!(list, vec![34, 21, 13, 8, 5, 3]);
/// #
/// # impl<T> PartialOrd for Reverse<T> 
/// # where
/// #     T: ?Sized + PartialOrd
/// # {
/// #     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
/// #         self.0.partial_cmp(&other.0)
/// #             .map(Ordering::reverse)
/// #     }
/// # }
/// # 
/// # impl<T> Ord for Reverse<T> 
/// # where
/// #     T: ?Sized + Ord
/// # {
/// #     fn cmp(&self, other: &Self) -> Ordering {
/// #         self.0.cmp(&other.0).reverse()
/// #     }
/// # }
/// # 
/// ```
///
/// [`TransparentNewtype`]: ./transparent_newtype/trait.TransparentNewtype.html
#[cfg_attr(feature = "docsrs", doc(cfg(feature = "transparent_newtype")))]
#[macro_export]
macro_rules! impl_transparent_newtype {
    ($S:ty) => (
        #[inline(always)]
        fn from_inner_raw(from: *const <$S as $crate::TransparentNewtype>::Inner) -> *const $S {
            from as _
        }

        #[inline(always)]
        fn from_inner_raw_mut(from: *mut <$S as $crate::TransparentNewtype>::Inner) -> *mut $S {
            from as _
        }

        #[inline(always)]
        fn as_inner_raw(this: *const $S) -> *const <$S as $crate::TransparentNewtype>::Inner {
            this as _
        }

        #[inline(always)]
        fn as_inner_raw_mut(this: *mut $S) -> *mut <$S as $crate::TransparentNewtype>::Inner {
            this as _
        }
    )
}


/// For delegating the implementation of the [`TransparentNewtype`] trait to a field.
///
/// # Example
///
/// ```rust
/// use core_extensions::{TransparentNewtype, TransparentNewtypeExt};
///
/// use std::num::Wrapping;
///
/// #[derive(Debug, PartialEq, Eq)]
/// #[repr(transparent)]
/// struct Foo<T>(Wrapping<T>);
///
/// unsafe impl<T> TransparentNewtype for Foo<T> {
///     core_extensions::delegate_transparent_newtype_impl!{
///         // This argument must be `Self`
///         // (it could also be Foo<T> in here, it's just easier to always write Self)
///         Self,
///         // The type of the field that this delegates to
///         Wrapping<T>
///     }
/// }
/// 
/// assert_eq!(Foo::<u8>::from_inner(3), Foo(Wrapping(3)));
/// assert_eq!(Foo::<bool>::from_inner_ref(&true), &Foo(Wrapping(true)));
/// assert_eq!(Foo::<&str>::from_inner_mut(&mut "hello"), &mut Foo(Wrapping("hello")));
/// ```
///
/// [`TransparentNewtype`]: ./transparent_newtype/trait.TransparentNewtype.html 
#[cfg_attr(feature = "docsrs", doc(cfg(feature = "transparent_newtype")))]
#[macro_export]
macro_rules! delegate_transparent_newtype_impl {
    ($S:ty, $Field:ty) => (
        type Inner = <$Field as $crate::TransparentNewtype>::Inner;

        #[inline(always)]
        fn from_inner_raw(from: *const <$S as $crate::TransparentNewtype>::Inner) -> *const $S {
            <$Field as $crate::TransparentNewtype>::from_inner_raw(from)
                as _
        }

        #[inline(always)]
        fn from_inner_raw_mut(from: *mut <$S as $crate::TransparentNewtype>::Inner) -> *mut $S {
            <$Field as $crate::TransparentNewtype>::from_inner_raw_mut(from)
                as _
        }

        #[inline(always)]
        fn as_inner_raw(this: *const $S) -> *const <$S as $crate::TransparentNewtype>::Inner {
            <$Field as $crate::TransparentNewtype>::as_inner_raw(this as _)
        }

        #[inline(always)]
        fn as_inner_raw_mut(this: *mut $S) -> *mut <$S as $crate::TransparentNewtype>::Inner {
            <$Field as $crate::TransparentNewtype>::as_inner_raw_mut(this as _)
        }
    )
}