From 6dd946dc1150df377f65367f78ef0b507f0438bd Mon Sep 17 00:00:00 2001
From: Owen Avery <powerboat9.gamer@gmail.com>
Date: Fri, 12 May 2023 03:14:29 -0400
Subject: Allow hashing Optional<T>

gcc/rust/ChangeLog:

	* util/rust-optional.h
	(struct std::hash<Optional<T>>): New.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>
---
 gcc/rust/util/rust-optional.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'gcc')

diff --git a/gcc/rust/util/rust-optional.h b/gcc/rust/util/rust-optional.h
index 01a5ff0..7276c48 100644
--- a/gcc/rust/util/rust-optional.h
+++ b/gcc/rust/util/rust-optional.h
@@ -228,6 +228,18 @@ public:
 
 } // namespace Rust
 
+namespace std {
+
+template <typename T> struct hash<Rust::Optional<T>>
+{
+  size_t operator() (const Rust::Optional<T> &op) const
+  {
+    return op.is_some () ? std::hash<T> () (op.get ()) : 0;
+  }
+};
+
+} // namespace std
+
 #ifdef CHECKING_P
 
 void
-- 
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