Extract and reuse nodes creation code
diff --git a/tinyxml2.cpp b/tinyxml2.cpp
index e9b275b..e54940f 100755
--- a/tinyxml2.cpp
+++ b/tinyxml2.cpp
@@ -665,46 +665,34 @@
     TIXMLASSERT( sizeof( XMLComment ) == sizeof( XMLDeclaration ) );	// use same memory pool

     XMLNode* returnNode = 0;

     if ( XMLUtil::StringEqual( p, xmlHeader, xmlHeaderLen ) ) {

-        TIXMLASSERT( sizeof( XMLDeclaration ) == _commentPool.ItemSize() );

-        returnNode = new (_commentPool.Alloc()) XMLDeclaration( this );

+        returnNode = CreateUnlinkedNode<XMLDeclaration>( _commentPool );

         returnNode->_parseLineNum = _parseCurLineNum;

-        returnNode->_memPool = &_commentPool;

         p += xmlHeaderLen;

     }

     else if ( XMLUtil::StringEqual( p, commentHeader, commentHeaderLen ) ) {

-        TIXMLASSERT( sizeof( XMLComment ) == _commentPool.ItemSize() );

-        returnNode = new (_commentPool.Alloc()) XMLComment( this );

+        returnNode = CreateUnlinkedNode<XMLComment>( _commentPool );

         returnNode->_parseLineNum = _parseCurLineNum;

-        returnNode->_memPool = &_commentPool;

         p += commentHeaderLen;

     }

     else if ( XMLUtil::StringEqual( p, cdataHeader, cdataHeaderLen ) ) {

-        TIXMLASSERT( sizeof( XMLText ) == _textPool.ItemSize() );

-        XMLText* text = new (_textPool.Alloc()) XMLText( this );

+        XMLText* text = CreateUnlinkedNode<XMLText>( _textPool );

         returnNode = text;

         returnNode->_parseLineNum = _parseCurLineNum;

-        returnNode->_memPool = &_textPool;

         p += cdataHeaderLen;

         text->SetCData( true );

     }

     else if ( XMLUtil::StringEqual( p, dtdHeader, dtdHeaderLen ) ) {

-        TIXMLASSERT( sizeof( XMLUnknown ) == _commentPool.ItemSize() );

-        returnNode = new (_commentPool.Alloc()) XMLUnknown( this );

+        returnNode = CreateUnlinkedNode<XMLUnknown>( _commentPool );

         returnNode->_parseLineNum = _parseCurLineNum;

-        returnNode->_memPool = &_commentPool;

         p += dtdHeaderLen;

     }

     else if ( XMLUtil::StringEqual( p, elementHeader, elementHeaderLen ) ) {

-        TIXMLASSERT( sizeof( XMLElement ) == _elementPool.ItemSize() );

-        returnNode = new (_elementPool.Alloc()) XMLElement( this );

+        returnNode =  CreateUnlinkedNode<XMLElement>( _elementPool );

         returnNode->_parseLineNum = _parseCurLineNum;

-        returnNode->_memPool = &_elementPool;

         p += elementHeaderLen;

     }

     else {

-        TIXMLASSERT( sizeof( XMLText ) == _textPool.ItemSize() );

-        returnNode = new (_textPool.Alloc()) XMLText( this );

-        returnNode->_memPool = &_textPool;

+        returnNode = CreateUnlinkedNode<XMLText>( _textPool );

         returnNode->_parseLineNum = _parseCurLineNum; // Report line of first non-whitespace character

         p = start;	// Back it up, all the text counts.

         _parseCurLineNum = startLine;

@@ -2008,9 +1996,7 @@
 

 XMLElement* XMLDocument::NewElement( const char* name )

 {

-    TIXMLASSERT( sizeof( XMLElement ) == _elementPool.ItemSize() );

-    XMLElement* ele = new (_elementPool.Alloc()) XMLElement( this );

-    ele->_memPool = &_elementPool;

+    XMLElement* ele = CreateUnlinkedNode<XMLElement>( _elementPool );

     ele->SetName( name );

     return ele;

 }

@@ -2018,9 +2004,7 @@
 

 XMLComment* XMLDocument::NewComment( const char* str )

 {

-    TIXMLASSERT( sizeof( XMLComment ) == _commentPool.ItemSize() );

-    XMLComment* comment = new (_commentPool.Alloc()) XMLComment( this );

-    comment->_memPool = &_commentPool;

+    XMLComment* comment = CreateUnlinkedNode<XMLComment>( _commentPool );

     comment->SetValue( str );

     return comment;

 }

@@ -2028,9 +2012,7 @@
 

 XMLText* XMLDocument::NewText( const char* str )

 {

-    TIXMLASSERT( sizeof( XMLText ) == _textPool.ItemSize() );

-    XMLText* text = new (_textPool.Alloc()) XMLText( this );

-    text->_memPool = &_textPool;

+    XMLText* text = CreateUnlinkedNode<XMLText>( _textPool );

     text->SetValue( str );

     return text;

 }

@@ -2038,9 +2020,7 @@
 

 XMLDeclaration* XMLDocument::NewDeclaration( const char* str )

 {

-    TIXMLASSERT( sizeof( XMLDeclaration ) == _commentPool.ItemSize() );

-    XMLDeclaration* dec = new (_commentPool.Alloc()) XMLDeclaration( this );

-    dec->_memPool = &_commentPool;

+    XMLDeclaration* dec = CreateUnlinkedNode<XMLDeclaration>( _commentPool );

     dec->SetValue( str ? str : "xml version=\"1.0\" encoding=\"UTF-8\"" );

     return dec;

 }

@@ -2048,9 +2028,7 @@
 

 XMLUnknown* XMLDocument::NewUnknown( const char* str )

 {

-    TIXMLASSERT( sizeof( XMLUnknown ) == _commentPool.ItemSize() );

-    XMLUnknown* unk = new (_commentPool.Alloc()) XMLUnknown( this );

-    unk->_memPool = &_commentPool;

+    XMLUnknown* unk = CreateUnlinkedNode<XMLUnknown>( _commentPool );

     unk->SetValue( str );

     return unk;

 }