X-Git-Url: https://git.chrismorgan.info/anymap/blobdiff_plain/18518214c4609e182be5277b14c7c510c8fa9505..fdba2f45b9b9d6fa05be6a4d0849add42d94516e:/src/raw/any.rs

diff --git a/src/raw/any.rs b/src/raw/any.rs
new file mode 100644
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--- /dev/null
+++ b/src/raw/any.rs
@@ -0,0 +1,105 @@
+use std::fmt;
+use std::any::Any as StdAny;
+
+#[cfg(feature = "clone")]
+#[doc(hidden)]
+pub trait CloneToAny {
+    /// Clone `self` into a new `Box<Any>` object.
+    fn clone_to_any(&self) -> Box<Any>;
+}
+
+#[cfg(feature = "clone")]
+impl<T: Any + Clone> CloneToAny for T {
+    fn clone_to_any(&self) -> Box<Any> {
+        Box::new(self.clone())
+    }
+}
+
+macro_rules! define_any {
+    (#[$m:meta] $t:item $i:item) => {
+        /// A type to emulate dynamic typing.
+        ///
+        /// Every suitable type with no non-`'static` references implements `Any`. See the
+        /// [`std::any` documentation](https://doc.rust-lang.org/std/any/index.html) for more
+        /// details on `Any` in general.
+        ///
+        /// This trait is not `std::any::Any` but rather a type extending that for this library’s
+        /// purposes; most specifically, there are a couple of Cargo features that can be enabled
+        /// which will alter the constraints of what comprises a suitable type:
+        ///
+        /// <table>
+        ///     <thead>
+        ///         <tr>
+        ///             <th title="The name of the Cargo feature to enable">Feature name</th>
+        ///             <th title="If a type doesn’t satisfy these bounds, it won’t implement Any">Additional bounds</th>
+        ///             <th title="Were these docs built with this feature enabled?">Enabled in these docs?</th>
+        ///         </tr>
+        ///     </thead>
+        ///     <tbody>
+        ///         <tr>
+        ///             <th><code>clone</code></th>
+        ///             <td><code><a class=trait title=core::clone::Clone
+        ///             href=http://doc.rust-lang.org/std/clone/trait.Clone.html
+        ///             >Clone</a></code></td>
+        #[cfg_attr(feature = "clone", doc = "             <td>Yes</td>")]
+        #[cfg_attr(not(feature = "clone"), doc = "             <td>No</td>")]
+        ///         </tr>
+        ///         <tr>
+        ///             <th><code>concurrent</code></th>
+        ///             <td><code><a class=trait title=core::marker::Send
+        ///             href=http://doc.rust-lang.org/std/marker/trait.Send.html
+        ///             >Send</a> + <a class=trait title=core::marker::Sync
+        ///             href=http://doc.rust-lang.org/std/marker/trait.Sync.html
+        ///             >Sync</a></code></td>
+        #[cfg_attr(feature = "concurrent", doc = "             <td>Yes</td>")]
+        #[cfg_attr(not(feature = "concurrent"), doc = "             <td>No</td>")]
+        ///         </tr>
+        ///     </tbody>
+        /// </table>
+        #[$m] $t
+        #[$m] $i
+    }
+}
+
+define_any! {
+    #[cfg(all(not(feature = "clone"), not(feature = "concurrent")))]
+    pub trait Any: StdAny { }
+    impl<T: StdAny> Any for T { }
+}
+
+define_any! {
+    #[cfg(all(feature = "clone", not(feature = "concurrent")))]
+    pub trait Any: StdAny + CloneToAny { }
+    impl<T: StdAny + Clone> Any for T { }
+}
+
+define_any! {
+    #[cfg(all(not(feature = "clone"), feature = "concurrent"))]
+    pub trait Any: StdAny + Send + Sync { }
+    impl<T: StdAny + Send + Sync> Any for T { }
+}
+
+define_any! {
+    #[cfg(all(feature = "clone", feature = "concurrent"))]
+    pub trait Any: StdAny + CloneToAny + Send + Sync { }
+    impl<T: StdAny + Clone + Send + Sync> Any for T { }
+}
+
+#[cfg(feature = "clone")]
+impl Clone for Box<Any> {
+    fn clone(&self) -> Box<Any> {
+        (**self).clone_to_any()
+    }
+}
+
+impl<'a> fmt::Debug for &'a Any {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("&Any")
+    }
+}
+
+impl<'a> fmt::Debug for Box<Any> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("Box<Any>")
+    }
+}