Adding case for void state to production_value_callback (#182)

foonathan · Nov 8, 2023 · 604a621 · 604a621
1 parent d76ce0c
commit 604a621
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/include/lexy/grammar.hpp b/include/lexy/grammar.hpp
@@ -340,7 +340,8 @@ class production_value_callback
     template <typename... Args>
     constexpr return_type operator()(Args&&... args) const
     {
-        if constexpr (lexy::is_callback_with_state_for<_type, ParseState, Args&&...>)
+        if constexpr (lexy::is_callback_with_state_for<_type, ParseState, Args&&...>
+                      && !std::is_void_v<ParseState>)
         {
             return _get_value(_state)[*_state](LEXY_FWD(args)...);
         }