From 65ec3764e59353995a4feaa4214aea8c3e59bc3a Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Wed, 30 Oct 2019 22:52:25 +0100
Subject: =?UTF-8?q?Basic=20node=20spans=20=E2=9C=85?=
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---
 src/func/mod.rs | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/func')

diff --git a/src/func/mod.rs b/src/func/mod.rs
index b3918253..30b5b825 100644
--- a/src/func/mod.rs
+++ b/src/func/mod.rs
@@ -42,6 +42,13 @@ pub trait Function: FunctionBounds {
     fn layout(&self, ctx: LayoutContext) -> LayoutResult<CommandList>;
 }
 
+impl dyn Function {
+    /// Downcast a dynamic function to a concrete function type.
+    pub fn downcast<F>(&self) -> Option<&F> where F: Function + 'static {
+        self.help_cast_as_any().downcast_ref::<F>()
+    }
+}
+
 impl PartialEq for dyn Function {
     fn eq(&self, other: &dyn Function) -> bool {
         self.help_eq(other)
-- 
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