Optimize SHAMapItem construction

src/ripple/shamap/SHAMap.h

@@ -138,6 +138,7 @@ public:
     bool hasItem (uint256 const& id) const;
     bool delItem (uint256 const& id);
     bool addItem (SHAMapItem const& i, bool isTransaction, bool hasMeta);
+    bool addItem (SHAMapItem&& i, bool isTransaction, bool hasMeta);
     uint256 getHash () const;
 
     // save a copy if you have a temporary anyway

src/ripple/shamap/SHAMapItem.h

@@ -40,6 +40,7 @@ private:
 public:
     SHAMapItem (uint256 const& tag, Blob const & data);
     SHAMapItem (uint256 const& tag, Serializer const& s);
+    SHAMapItem (uint256 const& tag, Serializer&& s);
 
     Slice slice() const;
 

src/ripple/shamap/impl/SHAMap.cpp

@@ -798,6 +798,13 @@ bool SHAMap::addItem (const SHAMapItem& i, bool isTransaction, bool hasMetaData)
     return addGiveItem(std::make_shared<SHAMapItem const>(i), isTransaction, hasMetaData);
 }
 
+bool
+SHAMap::addItem(SHAMapItem&& i, bool isTransaction, bool hasMetaData)
+{
+    return addGiveItem(std::make_shared<SHAMapItem const>(std::move(i)),
+                                                          isTransaction, hasMetaData);
+}
+
 uint256
 SHAMap::getHash () const
 {

src/ripple/shamap/impl/SHAMapItem.cpp

@@ -37,4 +37,10 @@ SHAMapItem::SHAMapItem (uint256 const& tag, const Serializer& data)
 {
 }
 
+SHAMapItem::SHAMapItem (uint256 const& tag, Serializer&& data)
+    : tag_ (tag)
+    , data_(std::move(data.modData()))
+{
+}
+
 } // ripple