From aa789f47d5f2899f489cc1a1288f96280d6da9db Mon Sep 17 00:00:00 2001
From: Chris Harris <chris.harris@kitware.com>
Date: Thu, 20 Sep 2018 11:19:33 -0400
Subject: [PATCH] Patch nlohmann/json for GCC 4.8

See https://github.com/nlohmann/json/pull/212 for details
---
 include/nlohmann/detail/macro_scope.hpp |  2 +-
 include/nlohmann/json.hpp               | 36 ++++++++++++++-----------
 2 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/include/nlohmann/detail/macro_scope.hpp b/include/nlohmann/detail/macro_scope.hpp
index a5b6101e83..745a0c4d7f 100644
--- a/include/nlohmann/detail/macro_scope.hpp
+++ b/include/nlohmann/detail/macro_scope.hpp
@@ -10,7 +10,7 @@
             #error "unsupported Clang version - see https://github.com/nlohmann/json#supported-compilers"
         #endif
     #elif defined(__GNUC__) && !(defined(__ICC) || defined(__INTEL_COMPILER))
-        #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40900
+        #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40800
             #error "unsupported GCC version - see https://github.com/nlohmann/json#supported-compilers"
         #endif
     #endif
diff --git a/include/nlohmann/json.hpp b/include/nlohmann/json.hpp
index 1f39e3ec76..30e12e0e34 100644
--- a/include/nlohmann/json.hpp
+++ b/include/nlohmann/json.hpp
@@ -4943,6 +4943,23 @@ class basic_json
         return {it, res.second};
     }
 
+    /// helper for insertion of an iterator (supports GCC 4.8+)
+    template<typename... Args>
+    iterator insert_iterator(const_iterator pos, Args&& ... args)
+    {
+        iterator result(this);
+        assert(m_value.array != nullptr);
+
+        auto insert_pos = std::distance(m_value.array->begin(), pos.m_it.array_iterator);
+        m_value.array->insert(pos.m_it.array_iterator, std::forward<Args>(args)...);
+        result.m_it.array_iterator = m_value.array->begin() + insert_pos;
+
+        // For GCC 4.9+ only, this could become:
+        // result.m_it.array_iterator = m_value.array->insert(pos.m_it.array_iterator, cnt, val);
+
+        return result;
+    }
+
     /*!
     @brief inserts element
 
@@ -4977,9 +4994,7 @@ class basic_json
             }
 
             // insert to array and return iterator
-            iterator result(this);
-            result.m_it.array_iterator = m_value.array->insert(pos.m_it.array_iterator, val);
-            return result;
+            return insert_iterator(pos, val);
         }
 
         JSON_THROW(type_error::create(309, "cannot use insert() with " + std::string(type_name())));
@@ -5030,9 +5045,7 @@ class basic_json
             }
 
             // insert to array and return iterator
-            iterator result(this);
-            result.m_it.array_iterator = m_value.array->insert(pos.m_it.array_iterator, cnt, val);
-            return result;
+            return insert_iterator(pos, cnt, val);
         }
 
         JSON_THROW(type_error::create(309, "cannot use insert() with " + std::string(type_name())));
@@ -5094,12 +5107,7 @@ class basic_json
         }
 
         // insert to array and return iterator
-        iterator result(this);
-        result.m_it.array_iterator = m_value.array->insert(
-                                         pos.m_it.array_iterator,
-                                         first.m_it.array_iterator,
-                                         last.m_it.array_iterator);
-        return result;
+        return insert_iterator(pos, first.m_it.array_iterator, last.m_it.array_iterator);
     }
 
     /*!
@@ -5141,9 +5149,7 @@ class basic_json
         }
 
         // insert to array and return iterator
-        iterator result(this);
-        result.m_it.array_iterator = m_value.array->insert(pos.m_it.array_iterator, ilist.begin(), ilist.end());
-        return result;
+        return insert_iterator(pos, ilist.begin(), ilist.end());
     }
 
     /*!