From daa6b31c5d0ca7f895fb495218d6ae56f33aff19 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Sat, 24 Aug 2024 13:24:23 +0200
Subject: [PATCH] msvc17 workaround

---
 src/ifcparse/IfcFile.cpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/ifcparse/IfcFile.cpp b/src/ifcparse/IfcFile.cpp
index 1cf65b33a3..830754444f 100644
--- a/src/ifcparse/IfcFile.cpp
+++ b/src/ifcparse/IfcFile.cpp
@@ -29,10 +29,18 @@ namespace {
     template<typename Variant, typename T>
     struct is_type_in_variant;
 
-    template<typename T, typename... Types>
-    struct is_type_in_variant<boost::variant<Types...>, T>
+    // Specialization when there are multiple types in the variant
+    template<typename T, typename First, typename... Rest>
+    struct is_type_in_variant<boost::variant<First, Rest...>, T>
     {
-        static constexpr bool value = (std::is_same<T, Types>::value || ...);
+        static constexpr bool value = std::is_same<T, First>::value || is_type_in_variant<boost::variant<Rest...>, T>::value;
+    };
+
+    // Specialization when there is only one type left in the variant
+    template<typename T, typename Last>
+    struct is_type_in_variant<boost::variant<Last>, T>
+    {
+        static constexpr bool value = std::is_same<T, Last>::value;
     };
 
     template<typename Variant, typename T>