From f33e8d194bffc245d875a990136611af87e5c679 Mon Sep 17 00:00:00 2001
From: Christoph Hasse <christoph.hasse@cern.ch>
Date: Wed, 29 Jun 2022 10:43:55 +0200
Subject: [PATCH] fix(functors) introduce Functors::Optional<T>::value_type
---
Phys/FunctorCore/include/Functors/Optional.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/Phys/FunctorCore/include/Functors/Optional.h b/Phys/FunctorCore/include/Functors/Optional.h
index 4f6fb0219bc..c073bc3985e 100644
--- a/Phys/FunctorCore/include/Functors/Optional.h
+++ b/Phys/FunctorCore/include/Functors/Optional.h
@@ -26,6 +26,8 @@ namespace Functors {
*/
template <typename T>
struct Optional {
+ using value_type = T;
+
Optional() = default;
Optional( std::nullopt_t /*unused*/ ){};
template <typename U = T,
--
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