From 60c0eb04d5e9fd761f5987d33af49cadf9506d62 Mon Sep 17 00:00:00 2001
From: Alexis Placet <alexis.placet@quantstack.net>
Date: Tue, 3 Sep 2024 11:20:06 +0200
Subject: [PATCH] Fix

---
 include/sparrow/arrow_array_schema_proxy.hpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/include/sparrow/arrow_array_schema_proxy.hpp b/include/sparrow/arrow_array_schema_proxy.hpp
index 3cd9777f..0c9ba8c0 100644
--- a/include/sparrow/arrow_array_schema_proxy.hpp
+++ b/include/sparrow/arrow_array_schema_proxy.hpp
@@ -413,21 +413,25 @@ namespace sparrow
         return array().private_data;
     }
 
-    template <typename... Callable>
-    struct visitor : Callable...
+    template <class... Ts>
+    struct overloaded : Ts...
     {
-        using Callable::operator()...;
+        using Ts::operator()...;
     };
+    // Although not required in C++20, clang needs it to build the code below
+    template <class... Ts>
+    overloaded(Ts...) -> overloaded<Ts...>;
 
     template <typename T>
     [[nodiscard]] T& get_variant(auto& var)
     {
         return std::visit(
-            visitor{
+            overloaded{
                 [](T* ptr) -> T&
                 {
                     if (ptr == nullptr)
                     {
+                        // TODO: Replace with a more specific exception
                         throw std::runtime_error("Null pointer");
                     }
                     return *ptr;