From 2fa916530ecf2fc96b55cb8477b623959ac21933 Mon Sep 17 00:00:00 2001
From: Zach Laine <whatwasthataddress@gmail.com>
Date: Sat, 9 Mar 2024 17:28:57 -0600
Subject: [PATCH] Add missing optional<Container> overloads of detail::append.

---
 include/boost/parser/parser.hpp | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/include/boost/parser/parser.hpp b/include/boost/parser/parser.hpp
index 51076a43..0e4e73c3 100644
--- a/include/boost/parser/parser.hpp
+++ b/include/boost/parser/parser.hpp
@@ -370,6 +370,7 @@ namespace boost { namespace parser {
 #if defined(_MSC_VER)
 #pragma warning(pop)
 #endif
+
         template<typename T>
         using print_type = typename print_t<T>::type;
 
@@ -1322,6 +1323,16 @@ namespace boost { namespace parser {
             }
         }
 
+        template<typename Container, typename T>
+        void append(std::optional<Container> & c, T && x, bool gen_attrs)
+        {
+            if (!gen_attrs)
+                return;
+            if (!c)
+                c = Container();
+            return detail::append(*c, (T &&) x, gen_attrs);
+        }
+
         template<typename Container>
         void append(Container & c, nope &&, bool)
         {}
@@ -1348,6 +1359,20 @@ namespace boost { namespace parser {
             }
         }
 
+        template<typename Container, typename Iter, typename Sentinel>
+        void append(
+            std::optional<Container> & c,
+            Iter first,
+            Sentinel last,
+            bool gen_attrs)
+        {
+            if (!gen_attrs)
+                return;
+            if (!c)
+                c = Container();
+            return detail::append(*c, first, last, gen_attrs);
+        }
+
         template<typename Iter, typename Sentinel>
         void append(nope &, Iter first, Sentinel last, bool gen_attrs)
         {}