From b94c2a12033362ec41ca5e5d65fb9d3e10da16e8 Mon Sep 17 00:00:00 2001
From: Milo Yip <miloyip@gmail.com>
Date: Fri, 8 Feb 2019 11:39:25 +0800
Subject: [PATCH] Adding swap() for GenericMember

---
 example/sortkeys/sortkeys.cpp | 5 +----
 include/rapidjson/document.h  | 6 ++++++
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/example/sortkeys/sortkeys.cpp b/example/sortkeys/sortkeys.cpp
index 022a6a4..72a6410 100644
--- a/example/sortkeys/sortkeys.cpp
+++ b/example/sortkeys/sortkeys.cpp
@@ -17,10 +17,7 @@ static void printIt(const Value &doc) {
 }
 
 struct NameComparator {
-    bool operator()(
-        const GenericMember<UTF8<>, MemoryPoolAllocator<> > &lhs,
-        const GenericMember<UTF8<>, MemoryPoolAllocator<> > &rhs) const
-    {
+    bool operator()(const Value::Member &lhs, const Value::Member &rhs) const {
         return (strcmp(lhs.name.GetString(), rhs.name.GetString()) < 0);
     }
 };
diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
index 73afea6..d1b90eb 100644
--- a/include/rapidjson/document.h
+++ b/include/rapidjson/document.h
@@ -66,6 +66,12 @@ template <typename Encoding, typename Allocator>
 struct GenericMember { 
     GenericValue<Encoding, Allocator> name;     //!< name of member (must be a string)
     GenericValue<Encoding, Allocator> value;    //!< value of member.
+
+    // swap() for std::sort() and other potential use in STL.
+    friend inline void swap(GenericMember& a, GenericMember& b) RAPIDJSON_NOEXCEPT {
+        a.name.Swap(b.name);
+        a.value.Swap(b.value);
+    }
 };
 
 ///////////////////////////////////////////////////////////////////////////////