From 11dd63d9e3f4a129c84caa58791d0cde1622586b Mon Sep 17 00:00:00 2001
From: Andrea Iob <andrea_iob@hotmail.com>
Date: Fri, 7 Jun 2024 11:43:37 +0200
Subject: [PATCH] common: add a custom implementation of std::void_t for C++11
 backwards compatibility

---
 src/common/compiler.hpp               | 20 ++++++++++++++++++++
 src/discretization/stencil_weight.hpp |  2 +-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/common/compiler.hpp b/src/common/compiler.hpp
index 40f03a4255..ef1a171ff5 100644
--- a/src/common/compiler.hpp
+++ b/src/common/compiler.hpp
@@ -96,4 +96,24 @@ do {                  \
  */
 #define BITPIT_COMMA ,
 
+
+/*!
+ * \ingroup common_misc
+ *
+ * Custom implementation of std::void_t for C++11 backwards compatibility.
+ */
+#if __cplusplus < 201703L
+template <class...>
+struct make_void { using type = void; };
+
+template <typename... T>
+using void_t = typename make_void<T...>::type;
+
+template <typename... T>
+using bitpit_void_t = void_t<T>;
+#else
+template <typename... T>
+using bitpit_void_t = std::void_t<T>;
+#endif
+
 #endif
diff --git a/src/discretization/stencil_weight.hpp b/src/discretization/stencil_weight.hpp
index 75398de2ea..4de16ebb95 100644
--- a/src/discretization/stencil_weight.hpp
+++ b/src/discretization/stencil_weight.hpp
@@ -67,7 +67,7 @@ class DiscreteStencilWeightValueInfo
 };
 
 template <typename weight_t>
-class DiscreteStencilWeightValueInfo<weight_t, std::void_t<typename weight_t::value_type>>
+class DiscreteStencilWeightValueInfo<weight_t, bitpit_void_t<typename weight_t::value_type>>
 {
 public:
     using type = typename weight_t::value_type;