diff --git a/Docs/ID_h/Classes/ID/index.html b/Docs/ID_h/Classes/ID/index.html
index e725d62..cf7029d 100644
--- a/Docs/ID_h/Classes/ID/index.html
+++ b/Docs/ID_h/Classes/ID/index.html
@@ -228,13 +228,19 @@ <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Discussion</font></
 <br><a name="HeaderDoc_functions"></a>
 <h2 class="h2tight">Member Functions</h2>
 <dl>
-<dt><tt><a href="index.html#//apple_ref/cpp/instm/ID/ID//(const)" target="_top">ID</a></tt></dt>
+<dt><tt><a href="index.html#//apple_ref/cpp/instm/ID/ID//(const)" target="_top">ID(const)</a></tt></dt>
 <dd><p>&#12467;&#12531;&#12473;&#12488;&#12521;&#12463;&#12479;&#12290;&#12487;&#12501;&#12457;&#12523;&#12488;&#12467;&#12531;&#12473;&#12488;&#12521;&#12463;&#12479;&#20860;&#12467;&#12500;&#12540;&#12467;&#12531;&#12473;&#12488;&#12521;&#12463;&#12479;
 </p></dd>
-<dt><tt><a href="index.html#//apple_ref/cpp/instm/ID/operator_id//()" target="_top">operator id</a></tt></dt>
+<dt><tt><a href="index.html#//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1" target="_top">ID(const)</a></tt></dt>
+<dd><p>&#12467;&#12500;&#12540;&#12467;&#12531;&#12473;&#12488;&#12521;&#12463;&#12479;&#12290;
+</p></dd>
+<dt><tt><a href="index.html#//apple_ref/cpp/instm/ID/operator_id/const/()" target="_top">operator id</a></tt></dt>
 <dd><p>object&#12501;&#12451;&#12540;&#12523;&#12489;&#12290;
 </p></dd>
-<dt><tt><a href="index.html#//apple_ref/cpp/instm/ID/operator+/ID/(const)" target="_top">operator+</a></tt></dt>
+<dt><tt><a href="index.html#//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const)" target="_top">operator+(const NSNumber * const)</a></tt></dt>
+<dd><p>&#21152;&#31639;&#28436;&#31639;&#23376;&#12458;&#12540;&#12496;&#12540;&#12525;&#12540;&#12489;&#12290;
+</p></dd>
+<dt><tt><a href="index.html#//apple_ref/cpp/instm/ID/operator+/ID/(const)" target="_top">operator+(const)</a></tt></dt>
 <dd><p>&#21152;&#31639;&#28436;&#31639;&#23376;&#12458;&#12540;&#12496;&#12540;&#12525;&#12540;&#12489;&#12290;
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 <dt><tt><a href="index.html#//apple_ref/cpp/instm/ID/operator+%3D/ID%26/(const)" target="_top">operator+=</a></tt></dt>
@@ -246,14 +252,14 @@ <h2 class="h2tight">Member Functions</h2>
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 <!-- headerDoc=instm;  uid=//apple_ref/cpp/instm/ID/ID//(const);   name=ID::ID --><a name="//apple_ref/cpp/instm/ID/ID//(const)"></a>
-<h3><a name="ID">ID</a></h3>
+<h3><a name="ID(const)">ID(const)</a></h3>
 <hr class="afterName">
 <p><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/ID//(const);name=start --><!-- begin abstract --></p>
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 <div class="declaration_indent">
 <pre><tt>public</tt>
-<br><a machinegenerated="true" href="index.html#//apple_ref/cpp/instm/ID/ID//(const)" logicalPath="//apple_ref/cpp/instm/ID/ID" target="_top"><span class="function">ID</span></a>(
+<br><a machinegenerated="true" href="index.html#//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1" logicalPath="//apple_ref/cpp/instm/ID/ID" target="_top"><span class="function">ID</span></a>(
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 </div>
 <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Parameters</font></h5>
@@ -272,15 +278,42 @@ <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Discussion</font></
 <!-- headerDoc=discussion;uid=//apple_ref/cpp/instm/ID/ID//(const);name=end --><!-- end discussion -->
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+<!-- headerDoc=instm;  uid=//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1;   name=ID::ID --><a name="//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1"></a>
+<h3><a name="ID(const)">ID(const)</a></h3>
+<hr class="afterName">
+<p><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1;name=start --><!-- begin abstract --></p>
+<p>&#12467;&#12500;&#12540;&#12467;&#12531;&#12473;&#12488;&#12521;&#12463;&#12479;&#12290;
+<!-- end abstract --><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1;name=end --></p>
+<div class="declaration_indent">
+<pre><tt>public</tt>
+<br><a machinegenerated="true" href="index.html#//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1" logicalPath="//apple_ref/cpp/instm/ID/ID" target="_top"><span class="function">ID</span></a>(
+    <span class="keyword">const</span> <span class="param">int</span>); </pre>
+</div>
+<h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Parameters</font></h5>
+<div class="param_indent">
+<dl>
+<dt>
+<!-- headerDoc=functionparam;  uid=//apple_ref/doc/functionparam/ID/ID/int;   name=ID::int -->
+<a name="//apple_ref/doc/functionparam/ID/ID/int"></a>
+<code>int</code>
+</dt>
+<dd><p>NSNumber&#12395;&#22793;&#25563;&#21487;&#33021;&#12394;&#22411;&#12290;</p></dd>
+</dl>
+</div>
+<h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Discussion</font></h5>
+<!-- begin discussion --><!-- headerDoc=discussion;uid=//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1;name=start --><p>id&#22411;&#12363;&#12425;&#12398;&#26263;&#40665;&#12398;&#22411;&#22793;&#25563;&#12434;&#23455;&#29694;&#12375;&#12390;&#12356;&#12427;&#12290;
+<!-- headerDoc=discussion;uid=//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1;name=end --><!-- end discussion -->
+</p>
+<hr class="betweenAPIEntries">
+<!-- headerDoc=instm;  uid=//apple_ref/cpp/instm/ID/operator_id/const/();   name=ID::operator id --><a name="//apple_ref/cpp/instm/ID/operator_id/const/()"></a>
 <h3><a name="operatorid">operator id</a></h3>
 <hr class="afterName">
-<p><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/operator_id//();name=start --><!-- begin abstract --></p>
+<p><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/operator_id/const/();name=start --><!-- begin abstract --></p>
 <p>object&#12501;&#12451;&#12540;&#12523;&#12489;&#12290;
-<!-- end abstract --><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/operator_id//();name=end --></p>
+<!-- end abstract --><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/operator_id/const/();name=end --></p>
 <div class="declaration_indent">
 <pre><tt>public</tt>
-<br><span class="keyword">operator</span> <a machinegenerated="true" href="index.html#//apple_ref/doc/functionparam/ID/operator+%3D/id" logicalPath="//apple_ref/cpp/instm/ID/id //apple_ref/cpp/clm/ID/id //apple_ref/cpp/intfcm/ID/id //apple_ref/cpp/intfm/ID/id //apple_ref/cpp/func/id //apple_ref/cpp/ftmplt/ID/id //apple_ref/cpp/defn/id //apple_ref/cpp/macro/id //apple_ref/doc/anysymbol/id" target="_top"><span class="function">id</span></a>(); </pre>
+<br><span class="keyword">operator</span> <span class="keyword">const</span> <a machinegenerated="true" href="index.html#//apple_ref/doc/functionparam/ID/operator+%3D/id" logicalPath="//apple_ref/cpp/instm/ID/id //apple_ref/cpp/clm/ID/id //apple_ref/cpp/intfcm/ID/id //apple_ref/cpp/intfm/ID/id //apple_ref/cpp/func/id //apple_ref/cpp/ftmplt/ID/id //apple_ref/cpp/defn/id //apple_ref/cpp/macro/id //apple_ref/doc/anysymbol/id" target="_top"><span class="function">id</span></a>() <span class="keyword">const</span>; </pre>
 </div>
 <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Return Value</font></h5>
 <p><!-- begin return value --></p>
@@ -288,12 +321,44 @@ <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Return Value</font>
 
 <!-- end return value --></p>
 <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Discussion</font></h5>
-<!-- begin discussion --><!-- headerDoc=discussion;uid=//apple_ref/cpp/instm/ID/operator_id//();name=start --><p>id&#22411;&#12408;&#12398;&#26263;&#40665;&#12398;&#22411;&#22793;&#25563;&#12434;&#23455;&#29694;&#12375;&#12390;&#12356;&#12427;&#12290;
-<!-- headerDoc=discussion;uid=//apple_ref/cpp/instm/ID/operator_id//();name=end --><!-- end discussion -->
+<!-- begin discussion --><!-- headerDoc=discussion;uid=//apple_ref/cpp/instm/ID/operator_id/const/();name=start --><p>id&#22411;&#12408;&#12398;&#26263;&#40665;&#12398;&#22411;&#22793;&#25563;&#12434;&#23455;&#29694;&#12375;&#12390;&#12356;&#12427;&#12290;
+<!-- headerDoc=discussion;uid=//apple_ref/cpp/instm/ID/operator_id/const/();name=end --><!-- end discussion -->
+</p>
+<hr class="betweenAPIEntries">
+<!-- headerDoc=instm;  uid=//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const);   name=ID::operator+ --><a name="//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const)"></a>
+<h3><a name="operator+(constNSNumber*const)">operator+(const NSNumber * const)</a></h3>
+<hr class="afterName">
+<p><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const);name=start --><!-- begin abstract --></p>
+<p>&#21152;&#31639;&#28436;&#31639;&#23376;&#12458;&#12540;&#12496;&#12540;&#12525;&#12540;&#12489;&#12290;
+<!-- end abstract --><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const);name=end --></p>
+<div class="declaration_indent">
+<pre><tt>public</tt>
+<br><a machinegenerated="true" href="index.html#//apple_ref/cpp/cl/ID" logicalPath="//apple_ref/cpp/cl/ID" target="_top"><span class="type">ID</span></a> <span class="keyword">operator</span>+(
+    <span class="keyword">const</span> <!-- a logicalPath="//apple_ref/cpp/cl/NSNumber //apple_ref/cpp/tdef/NSNumber //apple_ref/cpp/tag/NSNumber //apple_ref/cpp/struct/NSNumber //apple_ref/cpp/intf/NSNumber //apple_ref/doc/anysymbol/NSNumber" machineGenerated="true" --><span class="type">NSNumber</span><!-- /a --> <span class="type">*</span><span class="keyword">const</span> <span class="param">number</span>) <span class="keyword">const</span>; </pre>
+</div>
+<h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Parameters</font></h5>
+<div class="param_indent">
+<dl>
+<dt>
+<!-- headerDoc=functionparam;  uid=//apple_ref/doc/functionparam/ID/operator+/number;   name=operator+::number -->
+<a name="//apple_ref/doc/functionparam/ID/operator+/number"></a>
+<code>number</code>
+</dt>
+<dd> </dd>
+</dl>
+</div>
+<h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Return Value</font></h5>
+<p><!-- begin return value --></p>
+<p>ID
+
+<!-- end return value --></p>
+<h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Discussion</font></h5>
+<!-- begin discussion --><!-- headerDoc=discussion;uid=//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const);name=start --><p>object&#12501;&#12451;&#12540;&#12523;&#12489;&#12398;description&#25991;&#23383;&#21015;&#12392;&#24341;&#25968;&#12398;description&#25991;&#23383;&#21015;&#12434;&#32080;&#21512;&#12377;&#12427;&#12290;
+<!-- headerDoc=discussion;uid=//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const);name=end --><!-- end discussion -->
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 <hr class="betweenAPIEntries">
 <!-- headerDoc=instm;  uid=//apple_ref/cpp/instm/ID/operator+/ID/(const);   name=ID::operator+ --><a name="//apple_ref/cpp/instm/ID/operator+/ID/(const)"></a>
-<h3><a name="operator+">operator+</a></h3>
+<h3><a name="operator+(const)">operator+(const)</a></h3>
 <hr class="afterName">
 <p><!-- headerDoc=abstract;uid=//apple_ref/cpp/instm/ID/operator+/ID/(const);name=start --><!-- begin abstract --></p>
 <p>&#21152;&#31639;&#28436;&#31639;&#23376;&#12458;&#12540;&#12496;&#12540;&#12525;&#12540;&#12489;&#12290;
@@ -301,7 +366,7 @@ <h3><a name="operator+">operator+</a></h3>
 <div class="declaration_indent">
 <pre><tt>public</tt>
 <br><a machinegenerated="true" href="index.html#//apple_ref/cpp/cl/ID" logicalPath="//apple_ref/cpp/cl/ID" target="_top"><span class="type">ID</span></a> <span class="keyword">operator</span>+(
-    <span class="keyword">const</span> <span class="param">id</span>); </pre>
+    <span class="keyword">const</span> <span class="param">id</span>) <span class="keyword">const</span>; </pre>
 </div>
 <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Parameters</font></h5>
 <div class="param_indent">
@@ -364,7 +429,7 @@ <h3><a name="~ID">~ID</a></h3>
 <!-- end abstract --><!-- headerDoc=abstract;uid=//apple_ref/doc/title:instm/ID/~ID//();name=end --></p>
 <div class="declaration_indent">
 <pre><tt>public</tt>
-<br>~<a machinegenerated="true" href="index.html#//apple_ref/cpp/instm/ID/ID//(const)" logicalPath="//apple_ref/cpp/instm/ID/ID" target="_top"><span class="function">ID</span></a>(); </pre>
+<br>~<a machinegenerated="true" href="index.html#//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1" logicalPath="//apple_ref/cpp/instm/ID/ID" target="_top"><span class="function">ID</span></a>(); </pre>
 </div>
 <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Discussion</font></h5>
 <!-- begin discussion --><!-- headerDoc=discussion;uid=//apple_ref/doc/title:instm/ID/~ID//();name=start --><p>object&#12501;&#12451;&#12540;&#12523;&#12489;&#12399;release&#12373;&#12428;&#12427;&#12290;
@@ -396,7 +461,7 @@ <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Discussion</font></
 <p class="gapBeforeFooter">&nbsp;</p>
 <hr class="afterFooter">
 <div class="hd_copyright_and_timestamp">
-<p class="hd_timestamp">Last Updated: Wednesday, March 13, 2013
+<p class="hd_timestamp">Last Updated: Thursday, March 14, 2013
 </p>
 </div>
 </td>
diff --git a/Docs/ID_h/Classes/ID/toc.html b/Docs/ID_h/Classes/ID/toc.html
index 11cd491..cbce073 100644
--- a/Docs/ID_h/Classes/ID/toc.html
+++ b/Docs/ID_h/Classes/ID/toc.html
@@ -46,13 +46,15 @@
 <div toc="collapsible" class="collapsible">
 
 <ul class="tocSubEntryList">
-<!-- cdobj --><li class="tocSubEntry"><a href="index.html#//apple_ref/cpp/instm/ID/ID//(const)" target="_top">ID</a></li>
+<!-- cdobj --><li class="tocSubEntry"><a href="index.html#//apple_ref/cpp/instm/ID/ID//(const)" target="_top">ID(const)</a></li>
+<li class="tocSubEntry"><a href="index.html#//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1" target="_top">ID(const)</a></li>
 <li class="tocSubEntry"><a href="index.html#//apple_ref/doc/title:instm/ID/~ID//()" target="_top">~ID</a></li>
 </ul>
 <span class="hd_tocAccess">Public</span>
 <ul class="tocSubEntryList">
 <!-- public --><li class="tocSubEntry"><a href="index.html#//apple_ref/cpp/instm/ID/operator_id/const/()" target="_top">operator id</a></li>
-<li class="tocSubEntry"><a href="index.html#//apple_ref/cpp/instm/ID/operator+/ID/(const)" target="_top">operator+</a></li>
+<li class="tocSubEntry"><a href="index.html#//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const)" target="_top">operator+(const NSNumber * const)</a></li>
+<li class="tocSubEntry"><a href="index.html#//apple_ref/cpp/instm/ID/operator+/ID/(const)" target="_top">operator+(const)</a></li>
 <li class="tocSubEntry"><a href="index.html#//apple_ref/cpp/instm/ID/operator+%3D/ID%26/(const)" target="_top">operator+=</a></li>
 </ul>
 </div>
diff --git a/Docs/ID_h/index.html b/Docs/ID_h/index.html
index c2dda4f..7ac9a5b 100644
--- a/Docs/ID_h/index.html
+++ b/Docs/ID_h/index.html
@@ -230,7 +230,7 @@ <h2 class="h2tight">Classes</h2>
 <p class="gapBeforeFooter">&nbsp;</p>
 <hr class="afterFooter">
 <div class="hd_copyright_and_timestamp">
-<p class="hd_timestamp">Last Updated: Monday, March 11, 2013
+<p class="hd_timestamp">Last Updated: Thursday, March 14, 2013
 </p>
 </div>
 </td>
diff --git a/Docs/NSObject+OCppOperator_h/Classes/NSObject_OCppOperator_/index.html b/Docs/NSObject+OCppOperator_h/Classes/NSObject_OCppOperator_/index.html
index 6a6fa6d..2ba818d 100644
--- a/Docs/NSObject+OCppOperator_h/Classes/NSObject_OCppOperator_/index.html
+++ b/Docs/NSObject+OCppOperator_h/Classes/NSObject_OCppOperator_/index.html
@@ -252,7 +252,7 @@ <h5 class="tight"><font face="Lucida Grande,Helvetica,Arial">Return Value</font>
 <p class="gapBeforeFooter">&nbsp;</p>
 <hr class="afterFooter">
 <div class="hd_copyright_and_timestamp">
-<p class="hd_timestamp">Last Updated: Monday, March 11, 2013
+<p class="hd_timestamp">Last Updated: Thursday, March 14, 2013
 </p>
 </div>
 </td>
diff --git a/Docs/NSObject+OCppOperator_h/index.html b/Docs/NSObject+OCppOperator_h/index.html
index 334c56a..10d9e47 100644
--- a/Docs/NSObject+OCppOperator_h/index.html
+++ b/Docs/NSObject+OCppOperator_h/index.html
@@ -230,7 +230,7 @@ <h2 class="h2tight">Classes</h2>
 <p class="gapBeforeFooter">&nbsp;</p>
 <hr class="afterFooter">
 <div class="hd_copyright_and_timestamp">
-<p class="hd_timestamp">Last Updated: Monday, March 11, 2013
+<p class="hd_timestamp">Last Updated: Thursday, March 14, 2013
 </p>
 </div>
 </td>
diff --git a/Docs/OCppOperator_h/index.html b/Docs/OCppOperator_h/index.html
index 678d192..94030b9 100644
--- a/Docs/OCppOperator_h/index.html
+++ b/Docs/OCppOperator_h/index.html
@@ -222,7 +222,7 @@ <h2>Introduction</h2>
 <p class="gapBeforeFooter">&nbsp;</p>
 <hr class="afterFooter">
 <div class="hd_copyright_and_timestamp">
-<p class="hd_timestamp">Last Updated: Monday, March 11, 2013
+<p class="hd_timestamp">Last Updated: Thursday, March 14, 2013
 </p>
 </div>
 </td>
diff --git a/Docs/index.html b/Docs/index.html
index ee90064..cd82526 100644
--- a/Docs/index.html
+++ b/Docs/index.html
@@ -67,18 +67,22 @@ <h2>Functions</h2>
 <a logicalpath="//apple_ref/cpp/instm/ID/ID//(const)" name="group___function_ID" retarget="yes" href="ID_h/Classes/ID/index.html#//apple_ref/cpp/instm/ID/ID//(const)">ID::ID</a><br>
 </td>
 <td width="33%">
+<a logicalpath="//apple_ref/cpp/instm/ID/operator_id/const/()" retarget="yes" href="ID_h/Classes/ID/index.html#//apple_ref/cpp/instm/ID/operator_id/const/()">ID::operator id</a><br>
+</td>
+<td width="33%">
 <a logicalpath="//apple_ref/cpp/instm/ID/operator+/ID/(const)" retarget="yes" href="ID_h/Classes/ID/index.html#//apple_ref/cpp/instm/ID/operator+/ID/(const)">ID::operator+</a><br>
 </td>
-<td width="33%"></td>
 </tr>
 <tr>
 <td width="33%">
-<a logicalpath="//apple_ref/cpp/instm/ID/operator_id/const/()" retarget="yes" href="ID_h/Classes/ID/index.html#//apple_ref/cpp/instm/ID/operator_id/const/()">ID::operator id</a><br>
+<a logicalpath="//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1" retarget="yes" href="ID_h/Classes/ID/index.html#//apple_ref/cpp/instm/ID/ID//(const)_DONTLINK_1">ID::ID</a><br>
+</td>
+<td width="33%">
+<a logicalpath="//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const)" retarget="yes" href="ID_h/Classes/ID/index.html#//apple_ref/cpp/instm/ID/operator+/ID/(constNSNumber*const)">ID::operator+</a><br>
 </td>
 <td width="33%">
 <a logicalpath="//apple_ref/cpp/instm/ID/operator+%3D/ID%26/(const)" retarget="yes" href="ID_h/Classes/ID/index.html#//apple_ref/cpp/instm/ID/operator+%3D/ID%26/(const)">ID::operator+=</a><br>
 </td>
-<td width="33%"></td>
 </tr>
 </table>
 </blockquote>
diff --git a/OCppOperator/ID.h b/OCppOperator/ID.h
index 8d56b63..b6c9103 100644
--- a/OCppOperator/ID.h
+++ b/OCppOperator/ID.h
@@ -66,6 +66,14 @@ class ID
      @return ID
      */
     ID operator+(const id) const;
+    /*!
+     @method operator+
+     @abstract 加算演算子オーバーロード。
+     @discussion objectフィールドのdescription文字列と引数のdescription文字列を結合する。
+     @param number
+     @return ID
+     */
+    ID operator+(const NSNumber* const number) const;
     /*!
      @method operator+=
      @abstract 加算後代入演算子オーバーロード。
diff --git a/OCppOperator/ID.mm b/OCppOperator/ID.mm
index 3c44bfb..68e63d4 100644
--- a/OCppOperator/ID.mm
+++ b/OCppOperator/ID.mm
@@ -35,6 +35,18 @@
     return [[this->object description] stringByAppendingFormat:@"%@", source];
 }
 
+ID ID::operator+(const NSNumber* const number) const
+{
+    if (![*this isKindOfClass:[NSNumber class]])
+    {
+        return *this + (id)number;
+    }
+    
+    id left = [NSDecimalNumber decimalNumberWithString:[*this description]];
+    id right = [NSDecimalNumber decimalNumberWithString:[number description]];
+    return [left decimalNumberByAdding:right];
+}
+
 ID& ID::operator+=(const id source)
 {
     [*this autorelease];