Fix initialization order in auto_parser constructor

The issue was that we were calling m_parser.iterate() after moving
the parser, which could leave it in an invalid state. In C++20,
this might behave differently than C++17.

Fixed by reordering the member initializer list to call
parser.iterate() BEFORE moving the parser into m_parser.

This ensures the document is created while the parser is still valid.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

include/simdjson/convert.h

@@ -106,7 +106,8 @@ public:
   explicit auto_parser(ParserType &&parser,
                        padded_string_view const str) noexcept
     requires(!std::is_pointer_v<ParserType>)
-      : m_parser{std::move(parser)}, m_doc(m_parser.iterate(str)) {}
+      // Note: order matters! We need to call iterate BEFORE moving the parser
+      : m_doc(parser.iterate(str)), m_parser{std::move(parser)} {}
 
   explicit auto_parser(padded_string_view const str) noexcept
     requires(!std::is_pointer_v<ParserType>)

singleheader/simdjson.cpp

@@ -1,4 +1,4 @@
-/* auto-generated on 2025-08-03 15:28:40 +0000. Do not edit! */
+/* auto-generated on 2025-08-03 18:12:50 +0000. Do not edit! */
 /* including simdjson.cpp:  */
 /* begin file simdjson.cpp */
 #define SIMDJSON_SRC_SIMDJSON_CPP

singleheader/simdjson.h

@@ -1,4 +1,4 @@
-/* auto-generated on 2025-08-03 15:28:40 +0000. Do not edit! */
+/* auto-generated on 2025-08-03 18:12:50 +0000. Do not edit! */
 /* including simdjson.h:  */
 /* begin file simdjson.h */
 #ifndef SIMDJSON_H
@@ -135358,7 +135358,8 @@ public:
   explicit auto_parser(ParserType &&parser,
                        padded_string_view const str) noexcept
     requires(!std::is_pointer_v<ParserType>)
-      : m_parser{std::move(parser)}, m_doc(m_parser.iterate(str)) {}
+      // Note: order matters! We need to call iterate BEFORE moving the parser
+      : m_doc(parser.iterate(str)), m_parser{std::move(parser)} {}
 
   explicit auto_parser(padded_string_view const str) noexcept
     requires(!std::is_pointer_v<ParserType>)