From 446dbc9d6c4f5930da7bfbdf7c141ed9bc280922 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Sat, 18 Nov 2023 00:40:10 +0300
Subject: [PATCH] =?UTF-8?q?mdbx++:=20=D0=B4=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB?=
 =?UTF-8?q?=D0=B5=D0=BD=D0=B8=D0=B5=20`cursor::clone()`=20(backport).?=
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---
 mdbx.h++ | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/mdbx.h++ b/mdbx.h++
index 468e8df6..9438c865 100644
--- a/mdbx.h++
+++ b/mdbx.h++
@@ -4252,6 +4252,7 @@ public:
   inline cursor &operator=(cursor &&other) noexcept;
   inline cursor(cursor &&other) noexcept;
   inline ~cursor() noexcept;
+  inline cursor_managed clone(void *your_context = nullptr) const;
   MDBX_CXX14_CONSTEXPR operator bool() const noexcept;
   MDBX_CXX14_CONSTEXPR operator const MDBX_cursor *() const;
   MDBX_CXX14_CONSTEXPR operator MDBX_cursor *();
@@ -4420,7 +4421,8 @@ class LIBMDBX_API_TYPE cursor_managed : public cursor {
 
 public:
   /// \brief Creates a new managed cursor with underlying object.
-  cursor_managed() : cursor_managed(::mdbx_cursor_create(nullptr)) {
+  cursor_managed(void *your_context = nullptr)
+      : cursor_managed(::mdbx_cursor_create(your_context)) {
     if (MDBX_UNLIKELY(!handle_))
       MDBX_CXX20_UNLIKELY error::throw_exception(MDBX_ENOMEM);
   }
@@ -6036,6 +6038,12 @@ inline ptrdiff_t txn::estimate_to_last(map_handle map,
 
 MDBX_CXX11_CONSTEXPR cursor::cursor(MDBX_cursor *ptr) noexcept : handle_(ptr) {}
 
+inline cursor_managed cursor::clone(void *your_context) const {
+  cursor_managed clone(your_context);
+  error::success_or_throw(::mdbx_cursor_copy(handle_, clone.handle_));
+  return clone;
+}
+
 inline cursor &cursor::operator=(cursor &&other) noexcept {
   handle_ = other.handle_;
   other.handle_ = nullptr;