From d241703dd2d65f991d1d5c14a25bbdb0d29f4ac4 Mon Sep 17 00:00:00 2001
From: jrkoonce <30676875+jrkoonce@users.noreply.github.com>
Date: Tue, 3 Sep 2019 09:48:30 -0500
Subject: [PATCH] Made C++14 optional, default off.

---
 tiny_gltf.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tiny_gltf.h b/tiny_gltf.h
index 9e3c9f8..20fca6e 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -56,6 +56,10 @@
 #include <string>
 #include <vector>
 
+#ifndef TINYGLTF_USE_CPP14
+#include <functional>
+#endif
+
 #ifdef __ANDROID__
 #ifdef TINYGLTF_ANDROID_LOAD_FROM_ASSETS
 #include <android/asset_manager.h>
@@ -4938,7 +4942,13 @@ bool TinyGLTF::LoadFromString(Model *model, std::string *err, std::string *warn,
     }
   }
 
+#ifdef TINYGLTF_USE_CPP14
   auto ForEachInArray = [](const json& v, const char* member, const auto& cb)->bool
+#else
+  //The std::function<> implementation can be less efficient because it will allocate heap when the size of
+  //the captured lambda is above 16 bytes with clang and gcc, but it does not require C++14.
+  auto ForEachInArray = [](const json& v, const char* member, const std::function<bool(const json&)>& cb)->bool
+#endif
   {
     json_const_iterator it;
     if (FindMember(v, member, it) && IsArray(GetValue(it))) {