From 70205f5d880ed44b19e9c3481a89a5987b9ec7c8 Mon Sep 17 00:00:00 2001
From: Tindy X <49061470+tindy2013@users.noreply.github.com>
Date: Thu, 9 Apr 2020 22:38:02 +0800
Subject: [PATCH] Fix 'comparison object must be invocable as const' (#846)

---
 include/yaml-cpp/node/detail/node.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/yaml-cpp/node/detail/node.h b/include/yaml-cpp/node/detail/node.h
index 8b41466..dd12332 100644
--- a/include/yaml-cpp/node/detail/node.h
+++ b/include/yaml-cpp/node/detail/node.h
@@ -20,7 +20,7 @@ namespace detail {
 class node {
  private:
   struct less {
-    bool operator ()(const node* l, const node* r) {return l->m_index < r->m_index;}
+    bool operator ()(const node* l, const node* r) const {return l->m_index < r->m_index;}
   };
 
  public: