From 4539d1884e9fb7556a8ec91e83b7ef8f91bb3ff6 Mon Sep 17 00:00:00 2001
From: sxrzh <adfhkjafsdk@outlook.com>
Date: Sun, 5 Jul 2026 01:06:17 +0800
Subject: [PATCH 1/2] feat: add thread-safe contains() function for Node.

---
 include/yaml-cpp/node/impl.h |  6 ++++++
 include/yaml-cpp/node/node.h |  3 +++
 test/node/node_test.cpp      | 26 ++++++++++++++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/include/yaml-cpp/node/impl.h b/include/yaml-cpp/node/impl.h
index 773847eab..4190b5343 100644
--- a/include/yaml-cpp/node/impl.h
+++ b/include/yaml-cpp/node/impl.h
@@ -394,6 +394,12 @@ inline void Node::force_insert(const Key& key, const Value& value) {
   m_pNode->force_insert(key, value, m_pMemory);
 }
 
+template <typename Key>
+inline bool Node::contains(const Key& key) const {
+  EnsureNodeExists();
+  return ((const detail::node*)m_pNode)->get(key, m_pMemory) != nullptr;
+}
+
 // free functions
 inline bool operator==(const Node& lhs, const Node& rhs) { return lhs.is(rhs); }
 }  // namespace YAML
diff --git a/include/yaml-cpp/node/node.h b/include/yaml-cpp/node/node.h
index df55f5846..93661209d 100644
--- a/include/yaml-cpp/node/node.h
+++ b/include/yaml-cpp/node/node.h
@@ -114,6 +114,9 @@ class YAML_CPP_API Node {
   template <typename Key, typename Value>
   void force_insert(const Key& key, const Value& value);
 
+  template <typename Key>
+  bool contains(const Key& key) const;
+
  private:
   enum Zombie { ZombieNode };
   explicit Node(Zombie);
diff --git a/test/node/node_test.cpp b/test/node/node_test.cpp
index 6df7df1c9..f2cf62f90 100644
--- a/test/node/node_test.cpp
+++ b/test/node/node_test.cpp
@@ -10,6 +10,7 @@
 #include "gtest/gtest.h"
 
 #include <sstream>
+#include <yaml-cpp/null.h>
 
 namespace {
 
@@ -199,6 +200,31 @@ TEST(NodeTest, MissingKey) {
   EXPECT_THROW(node["bar"].as<std::string>(), InvalidNode);
 }
 
+TEST(NodeTest, MapContains) {
+  Node node, key;
+  node["foo"] = "value";
+  node["bar"] = "eulav";
+  node[1] = "hello";
+  key["test"] = "asdf";
+  key["test2"] = "ghjkl";
+  node[key] = 123;
+  EXPECT_TRUE(node.contains("foo"));
+  EXPECT_TRUE(node.contains("bar"));
+  EXPECT_TRUE(node.contains(1));
+  EXPECT_TRUE(node.contains(key));
+  EXPECT_TRUE(!node.contains("baz"));
+  EXPECT_TRUE(!node.contains(2));
+
+  node.remove("foo");
+  node.remove(key);
+  EXPECT_TRUE(!node.contains("foo"));
+  EXPECT_TRUE(node.contains("bar"));
+  EXPECT_TRUE(node.contains(1));
+  EXPECT_TRUE(!node.contains(key));
+  EXPECT_TRUE(!node.contains("baz"));
+  EXPECT_TRUE(!node.contains(2));
+}
+
 TEST(NodeTest, MapIntegerElementRemoval) {
   Node node;
   node[1] = "hello";

From 470d5e9a0c78fe8efab8634b0958231c23355b9d Mon Sep 17 00:00:00 2001
From: rzh789ABC <124703704+sxrzh@users.noreply.github.com>
Date: Sun, 5 Jul 2026 01:18:18 +0800
Subject: [PATCH 2/2] Remove unused include for yaml-cpp/null.h

Removed unused yaml-cpp/null.h include.
---
 test/node/node_test.cpp | 1 -
 1 file changed, 1 deletion(-)

diff --git a/test/node/node_test.cpp b/test/node/node_test.cpp
index f2cf62f90..b53c28566 100644
--- a/test/node/node_test.cpp
+++ b/test/node/node_test.cpp
@@ -10,7 +10,6 @@
 #include "gtest/gtest.h"
 
 #include <sstream>
-#include <yaml-cpp/null.h>
 
 namespace {