From 5282fac31796e26a279c58388fb1def47558f281 Mon Sep 17 00:00:00 2001
From: Gabriel Busnot <gabriel.busnot@arteris.com>
Date: Tue, 20 Jun 2023 19:10:49 +0000
Subject: [PATCH] base: define is_std_hash_enabled type trait

Change-Id: I7ffb7f80a90006d6b8cd42bdf3d63e34c6dbda01
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/71839
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
---
 src/base/type_traits.hh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/base/type_traits.hh b/src/base/type_traits.hh
index a42f786443..fd13044765 100644
--- a/src/base/type_traits.hh
+++ b/src/base/type_traits.hh
@@ -105,6 +105,17 @@ struct is_iterable<T,
 template <typename T>
 constexpr bool is_iterable_v = is_iterable<T>::value;
 
+// std::hash-enabled type trait
+template <typename, typename = void>
+struct is_std_hash_enabled: std::false_type {};
+
+template <typename T>
+struct is_std_hash_enabled<T,
+    std::void_t<decltype(std::hash<T>())>>: std::true_type {};
+
+template <typename T>
+constexpr bool is_std_hash_enabled_v = is_std_hash_enabled<T>::value;
+
 } // namespace gem5
 
 #endif // BASE_TYPETRAITS_HH