From 0526d7c29997bbb02400e4b23b23e1ce6595e040 Mon Sep 17 00:00:00 2001
From: Jonathan Hamilton <jtrhamilton@gmail.com>
Date: Thu, 28 May 2015 20:10:25 -0700
Subject: [PATCH] Return fallback if .as(fallback) called on a node that
 doesn't exist

Since 1025f76df1b32b6ec3571ca928d7797a768a3341 it seems that missing
nodes point to a 'zombie' node, where the m_isValid member is false.
This caused .as(const S& fallback) throw an exception if the node was
missing, instead of returning the provided fallback value (as was the
behaviour previous to the above commit)
---
 include/yaml-cpp/node/impl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/yaml-cpp/node/impl.h b/include/yaml-cpp/node/impl.h
index 26cccbd..d711527 100644
--- a/include/yaml-cpp/node/impl.h
+++ b/include/yaml-cpp/node/impl.h
@@ -149,7 +149,7 @@ inline const T Node::as() const {
 template <typename T, typename S>
 inline const T Node::as(const S& fallback) const {
   if (!m_isValid)
-    throw InvalidNode();
+    return fallback;
   return as_if<T, S>(*this)(fallback);
 }