From 737117332d962d47fef697f46313b9a001ab7775 Mon Sep 17 00:00:00 2001
From: marcel <marcel.zoll@zsw-bw.de>
Date: Mon, 30 Aug 2021 14:15:48 +0200
Subject: [PATCH] add a Node::ContainsKey function for quick checking of
 subordinated

---
 include/yaml-cpp/node/impl.h | 10 ++++++++++
 include/yaml-cpp/node/node.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/include/yaml-cpp/node/impl.h b/include/yaml-cpp/node/impl.h
index c89171c..261dc88 100644
--- a/include/yaml-cpp/node/impl.h
+++ b/include/yaml-cpp/node/impl.h
@@ -350,6 +350,16 @@ std::string key_to_string(const Key& key) {
 }
 
 // indexing
+template <typename Key>
+inline bool Node::ContainsKey(const Key& key) const {
+  EnsureNodeExists();
+  if (! IsMap())
+    return false;
+  detail::node* value =
+      static_cast<const detail::node&>(*m_pNode).get(key, m_pMemory);
+  return (bool)value;
+}
+
 template <typename Key>
 inline const Node Node::operator[](const Key& key) const {
   EnsureNodeExists();
diff --git a/include/yaml-cpp/node/node.h b/include/yaml-cpp/node/node.h
index c9e9a0a..634f09d 100644
--- a/include/yaml-cpp/node/node.h
+++ b/include/yaml-cpp/node/node.h
@@ -99,6 +99,8 @@ class YAML_CPP_API Node {
 
   // indexing
   template <typename Key>
+  bool ContainsKey(const Key& key) const;
+  template <typename Key>
   const Node operator[](const Key& key) const;
   template <typename Key>
   Node operator[](const Key& key);