From 0d1559bdd4eb248c4f5505ce98a48aa3cdff6cd0 Mon Sep 17 00:00:00 2001
From: cubeleo <41136688+cubeleo@users.noreply.github.com>
Date: Fri, 27 Jul 2018 08:32:19 -0700
Subject: [PATCH] For sparse enums, use a switch statement to generate
 EnumNameXXX(). (#4845)

---
 src/idl_gen_cpp.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/idl_gen_cpp.cpp b/src/idl_gen_cpp.cpp
index 5db8e5a..b8f1495 100644
--- a/src/idl_gen_cpp.cpp
+++ b/src/idl_gen_cpp.cpp
@@ -983,6 +983,23 @@ class CppGenerator : public BaseGenerator {
       code_ += "  return EnumNames{{ENUM_NAME}}()[index];";
       code_ += "}";
       code_ += "";
+    } else {
+      code_ += "inline const char *EnumName{{ENUM_NAME}}({{ENUM_NAME}} e) {";
+
+      code_ += "  switch (e) {";
+
+      for (auto it = enum_def.vals.vec.begin(); it != enum_def.vals.vec.end();
+           ++it) {
+        const auto &ev = **it;
+        code_ += "    case {{ENUM_NAME}}_" + Name(ev) + ": return \"" +
+                 Name(ev) + "\";";
+      }
+
+      code_ += "    default: return \"\";";
+      code_ += "  }";
+
+      code_ += "}";
+      code_ += "";
     }
 
     // Generate type traits for unions to map from a type to union enum value.
-- 
2.7.4