Add BOOST_NO_CXX17_DEFAULT_RESOURCE

test/boost_no_cxx17_default_resource.ipp

@@ -0,0 +1,27 @@
+//  (C) Copyright Samuel Debionne 2025. 
+//  Use, modification and distribution are subject to the 
+//  Boost Software License, Version 1.0. (See accompanying file 
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org/libs/config for most recent version.
+
+//  MACRO:         BOOST_NO_CXX17_DEFAULT_RESOURCE
+//  TITLE:         no cxx17 default resource
+//  DESCRIPTION:   The standard library is missing the default resource
+//                 related functions.
+//  
+//                 std::pmr::set_default_resource()
+//                 std::pmr::get_default_resource()
+
+#include <memory_resource>
+
+namespace boost_no_cxx17_default_resource{
+
+int test()
+{
+    std::pmr::set_default_resource(nullptr);
+    std::pmr::memory_resource* mr =std::pmr::get_default_resource();
+    return 0;
+}
+
+}