From c94c2734ae8afc7cbf489dc04a11b65805648b51 Mon Sep 17 00:00:00 2001
From: Justin B <justinb99@users.noreply.github.com>
Date: Mon, 20 Apr 2026 10:37:13 -0500
Subject: [PATCH] fix: resolve ambiguous operator<< overload for point<T> on
 Apple Clang 21

Apple Clang 21 strictly enforces template partial ordering, causing an ambiguity
between the explicit point<T> overload and the generic container template
C<T, Args...>. Add SFINAE to exclude point<T> from the generic overload.
---
 include/mapbox/geometry_io.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/mapbox/geometry_io.hpp b/include/mapbox/geometry_io.hpp
index 250bfdc..4f97b38 100644
--- a/include/mapbox/geometry_io.hpp
+++ b/include/mapbox/geometry_io.hpp
@@ -6,6 +6,7 @@
 #include <algorithm>
 #include <iostream>
 #include <string>
+#include <type_traits>
 
 namespace mapbox {
 namespace geometry {
@@ -21,7 +22,8 @@ std::ostream& operator<<(std::ostream& os, const point<T>& point)
     return os << '[' << point.x << ',' << point.y << ']';
 }
 
-template <typename T, template <class, class...> class C, class... Args>
+template <typename T, template <class, class...> class C, class... Args,
+          typename std::enable_if<!std::is_same<C<T, Args...>, point<T>>::value, int>::type = 0>
 std::ostream& operator<<(std::ostream& os, const C<T, Args...>& cont)
 {
     os << '[';