From aa3f7eae0256d1187be4a567f26065ba5960bec0 Mon Sep 17 00:00:00 2001
From: Gennaro Prota <gennaro.prota@gmail.com>
Date: Wed, 17 Dec 2025 19:30:59 +0100
Subject: [PATCH] Condition the NTTP tests on __cpp_nontype_template_args

They were conditioned on detection of C++20 via __cplusplus, but Clang
10 and 11 don't support class types as NTTP, even though they report
C++20 via __cplusplus when -std=c++20 is used.
---
 test/constexpr_tests.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/constexpr_tests.hpp b/test/constexpr_tests.hpp
index 636a4e9..abe73a2 100644
--- a/test/constexpr_tests.hpp
+++ b/test/constexpr_tests.hpp
@@ -667,7 +667,7 @@ testConstantEvaluation()
 #endif
 }
 
-#ifdef BOOST_STATIC_STRING_CPP20
+#if __cpp_nontype_template_args >= 201911L
 
 template<basic_static_string<32, char, cxper_char_traits> X>
 struct nttp_primary