🚧 trying nodiscard attribute #1433

include/nlohmann/detail/macro_scope.hpp

@@ -37,6 +37,15 @@
     #define JSON_DEPRECATED
 #endif
 
+// allow for portable nodiscard warnings
+#if defined(__has_cpp_attribute) && __has_cpp_attribute(nodiscard)
+    #define JSON_NODISCARD [[nodiscard]]
+#elif defined(__has_cpp_attribute) && __has_cpp_attribute(gnu::warn_unused_result)
+    #define JSON_NODISCARD [[gnu::warn_unused_result]]
+#else
+    #define JSON_NODISCARD
+#endif
+
 // allow to disable exceptions
 #if (defined(__cpp_exceptions) || defined(__EXCEPTIONS) || defined(_CPPUNWIND)) && !defined(JSON_NOEXCEPTION)
     #define JSON_THROW(exception) throw exception