From b2d69aacf445740828ee907bd84c138f309d9517 Mon Sep 17 00:00:00 2001
From: shassani <shassani@soe.ucsc.edu>
Date: Mon, 2 Jul 2018 09:34:18 -0700
Subject: [PATCH] Helper function to get empty string on nullptr (#4800)

Adds helper function to get empty string when String is nullptr.

This is to get over the fact that flat buffer builders will record null when data
is not present.
---
 include/flatbuffers/flatbuffers.h | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/include/flatbuffers/flatbuffers.h b/include/flatbuffers/flatbuffers.h
index 8b350cd90..4e2008f9f 100644
--- a/include/flatbuffers/flatbuffers.h
+++ b/include/flatbuffers/flatbuffers.h
@@ -335,7 +335,7 @@ const Vector<Offset<T>> *VectorCast(const Vector<Offset<U>> *ptr) {
 #endif
 
 // Convenient helper function to get the length of any vector, regardless
-// of wether it is null or not (the field is not set).
+// of whether it is null or not (the field is not set).
 template<typename T> static inline size_t VectorLength(const Vector<T> *v) {
   return v ? v->Length() : 0;
 }
@@ -357,6 +357,18 @@ struct String : public Vector<char> {
   }
 };
 
+// Convenience function to get std::string from a String returning an empty
+// string on null pointer.
+static inline std::string GetString(const String * str) {
+  return str ? str->str() : "";
+}
+
+// Convenience function to get char* from a String returning an empty string on
+// null pointer.
+static inline const char * GetCstring(const String * str) {
+  return str ? str->c_str() : "";
+}
+
 // Allocator interface. This is flatbuffers-specific and meant only for
 // `vector_downward` usage.
 class Allocator {