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/// Implements the following traits:
///
/// * `AsRef<object::Base>`
/// * `AsMut<object::Base>`
/// * `Object`
///
/// # Examples
///
/// Creating a wrapper around a named field.
///
/// ```rust
/// #[macro_use]
/// extern crate three;
///
/// three_object!(MyStruct::mesh);
/// struct MyStruct {
///     mesh: three::Mesh,
/// }
/// # fn main() {}
/// ```
///
/// If the field parameter is omitted then the field name defaults to `object`.
///
/// ```rust
/// #[macro_use]
/// extern crate three;
///
/// // Equivalent to `three_object!(MyStruct::object);`
/// three_object!(MyStruct);
/// struct MyStruct {
///     object: three::Mesh,
/// }
/// # fn main() {}
/// ```
///
/// [`object::Base`]: object/struct.Base.html
#[macro_export]
macro_rules! three_object {
    ($name:ident::$field:ident) => {
        impl AsRef<$crate::object::Base> for $name {
            fn as_ref(&self) -> &$crate::object::Base {
                &self.$field.as_ref()
            }
        }

        impl $crate::Object for $name {
            type Data = ();

            fn resolve_data(&self, _: & $crate::scene::SyncGuard) -> Self::Data {}
        }
    };

    ($name:ident) => {
        three_object!($name ::object);
    }
}

macro_rules! derive_DowncastObject {
    ($type:ident => $pattern:path) => {
        impl ::object::DowncastObject for $type {
            fn downcast(object: ::object::ObjectType) -> Option<Self> {
                match object {
                    $pattern (inner) => Some(inner),
                    _ => None,
                }
            }
        }
    }
}