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<title>[180814] trunk/Source/WTF</title>
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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/180814">180814</a></dd>
<dt>Author</dt> <dd>darin@apple.com</dd>
<dt>Date</dt> <dd>2015-02-27 22:02:30 -0800 (Fri, 27 Feb 2015)</dd>
</dl>

<h3>Log Message</h3>
<pre>Remove unused PossiblyNull
https://bugs.webkit.org/show_bug.cgi?id=142124

Reviewed by Andreas Kling.

* WTF.vcxproj/WTF.vcxproj: Removed the file.
* WTF.vcxproj/WTF.vcxproj.filters: Ditto.
* WTF.xcodeproj/project.pbxproj: Ditto.
* wtf/CMakeLists.txt: Ditto.
* wtf/PossiblyNull.h: Removed.

* wtf/FastMalloc.h: Moved everything to the left.
Moved member functions out of the TryMallocReturnValue class definition.
(WTF::TryMallocReturnValue::operator PossiblyNull&lt;T&gt;): Deleted.
(WTF::TryMallocReturnValue::getValue): Marked inline, changed to work
only with pointer types, not arbitrary non-pointer types.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWTFChangeLog">trunk/Source/WTF/ChangeLog</a></li>
<li><a href="#trunkSourceWTFWTFvcxprojWTFvcxproj">trunk/Source/WTF/WTF.vcxproj/WTF.vcxproj</a></li>
<li><a href="#trunkSourceWTFWTFvcxprojWTFvcxprojfilters">trunk/Source/WTF/WTF.vcxproj/WTF.vcxproj.filters</a></li>
<li><a href="#trunkSourceWTFWTFxcodeprojprojectpbxproj">trunk/Source/WTF/WTF.xcodeproj/project.pbxproj</a></li>
<li><a href="#trunkSourceWTFwtfCMakeListstxt">trunk/Source/WTF/wtf/CMakeLists.txt</a></li>
<li><a href="#trunkSourceWTFwtfFastMalloch">trunk/Source/WTF/wtf/FastMalloc.h</a></li>
</ul>

<h3>Removed Paths</h3>
<ul>
<li><a href="#trunkSourceWTFwtfPossiblyNullh">trunk/Source/WTF/wtf/PossiblyNull.h</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWTFChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/ChangeLog (180813 => 180814)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/ChangeLog        2015-02-28 03:21:37 UTC (rev 180813)
+++ trunk/Source/WTF/ChangeLog        2015-02-28 06:02:30 UTC (rev 180814)
</span><span class="lines">@@ -1,3 +1,22 @@
</span><ins>+2015-02-27  Darin Adler  &lt;darin@apple.com&gt;
+
+        Remove unused PossiblyNull
+        https://bugs.webkit.org/show_bug.cgi?id=142124
+
+        Reviewed by Andreas Kling.
+
+        * WTF.vcxproj/WTF.vcxproj: Removed the file.
+        * WTF.vcxproj/WTF.vcxproj.filters: Ditto.
+        * WTF.xcodeproj/project.pbxproj: Ditto.
+        * wtf/CMakeLists.txt: Ditto.
+        * wtf/PossiblyNull.h: Removed.
+
+        * wtf/FastMalloc.h: Moved everything to the left.
+        Moved member functions out of the TryMallocReturnValue class definition.
+        (WTF::TryMallocReturnValue::operator PossiblyNull&lt;T&gt;): Deleted.
+        (WTF::TryMallocReturnValue::getValue): Marked inline, changed to work
+        only with pointer types, not arbitrary non-pointer types.
+
</ins><span class="cx"> 2015-02-26  Brent Fulgham  &lt;bfulgham@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         [Win] Make build logs more legible by reducing noise
</span></span></pre></div>
<a id="trunkSourceWTFWTFvcxprojWTFvcxproj"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/WTF.vcxproj/WTF.vcxproj (180813 => 180814)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/WTF.vcxproj/WTF.vcxproj        2015-02-28 03:21:37 UTC (rev 180813)
+++ trunk/Source/WTF/WTF.vcxproj/WTF.vcxproj        2015-02-28 06:02:30 UTC (rev 180814)
</span><span class="lines">@@ -252,7 +252,6 @@
</span><span class="cx">     &lt;ClInclude Include=&quot;..\wtf\PassRef.h&quot; /&gt;
</span><span class="cx">     &lt;ClInclude Include=&quot;..\wtf\PassRefPtr.h&quot; /&gt;
</span><span class="cx">     &lt;ClInclude Include=&quot;..\wtf\Platform.h&quot; /&gt;
</span><del>-    &lt;ClInclude Include=&quot;..\wtf\PossiblyNull.h&quot; /&gt;
</del><span class="cx">     &lt;ClInclude Include=&quot;..\wtf\PrintStream.h&quot; /&gt;
</span><span class="cx">     &lt;ClInclude Include=&quot;..\wtf\RAMSize.h&quot; /&gt;
</span><span class="cx">     &lt;ClInclude Include=&quot;..\wtf\RandomNumber.h&quot; /&gt;
</span><span class="lines">@@ -772,4 +771,4 @@
</span><span class="cx">   &lt;Import Project=&quot;$(VCTargetsPath)\Microsoft.Cpp.targets&quot; /&gt;
</span><span class="cx">   &lt;ImportGroup Label=&quot;ExtensionTargets&quot;&gt;
</span><span class="cx">   &lt;/ImportGroup&gt;
</span><del>-&lt;/Project&gt;
</del><span class="cx">\ No newline at end of file
</span><ins>+&lt;/Project&gt;
</ins></span></pre></div>
<a id="trunkSourceWTFWTFvcxprojWTFvcxprojfilters"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/WTF.vcxproj/WTF.vcxproj.filters (180813 => 180814)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/WTF.vcxproj/WTF.vcxproj.filters        2015-02-28 03:21:37 UTC (rev 180813)
+++ trunk/Source/WTF/WTF.vcxproj/WTF.vcxproj.filters        2015-02-28 06:02:30 UTC (rev 180814)
</span><span class="lines">@@ -564,9 +564,6 @@
</span><span class="cx">     &lt;ClInclude Include=&quot;..\wtf\Platform.h&quot;&gt;
</span><span class="cx">       &lt;Filter&gt;wtf&lt;/Filter&gt;
</span><span class="cx">     &lt;/ClInclude&gt;
</span><del>-    &lt;ClInclude Include=&quot;..\wtf\PossiblyNull.h&quot;&gt;
-      &lt;Filter&gt;wtf&lt;/Filter&gt;
-    &lt;/ClInclude&gt;
</del><span class="cx">     &lt;ClInclude Include=&quot;..\wtf\PrintStream.h&quot;&gt;
</span><span class="cx">       &lt;Filter&gt;wtf&lt;/Filter&gt;
</span><span class="cx">     &lt;/ClInclude&gt;
</span><span class="lines">@@ -721,4 +718,4 @@
</span><span class="cx">     &lt;None Include=&quot;WTFPostBuild.cmd&quot; /&gt;
</span><span class="cx">     &lt;None Include=&quot;WTFPreBuild.cmd&quot; /&gt;
</span><span class="cx">   &lt;/ItemGroup&gt;
</span><del>-&lt;/Project&gt;
</del><span class="cx">\ No newline at end of file
</span><ins>+&lt;/Project&gt;
</ins></span></pre></div>
<a id="trunkSourceWTFWTFxcodeprojprojectpbxproj"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/WTF.xcodeproj/project.pbxproj (180813 => 180814)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/WTF.xcodeproj/project.pbxproj        2015-02-28 03:21:37 UTC (rev 180813)
+++ trunk/Source/WTF/WTF.xcodeproj/project.pbxproj        2015-02-28 06:02:30 UTC (rev 180814)
</span><span class="lines">@@ -199,7 +199,6 @@
</span><span class="cx">                 A8A47408151A825B004123FF /* ParallelJobsLibdispatch.h in Headers */ = {isa = PBXBuildFile; fileRef = A8A472E9151A825B004123FF /* ParallelJobsLibdispatch.h */; };
</span><span class="cx">                 A8A4740B151A825B004123FF /* PassOwnPtr.h in Headers */ = {isa = PBXBuildFile; fileRef = A8A472EC151A825B004123FF /* PassOwnPtr.h */; };
</span><span class="cx">                 A8A4740C151A825B004123FF /* PassRefPtr.h in Headers */ = {isa = PBXBuildFile; fileRef = A8A472ED151A825B004123FF /* PassRefPtr.h */; };
</span><del>-                A8A4740F151A825B004123FF /* PossiblyNull.h in Headers */ = {isa = PBXBuildFile; fileRef = A8A472F3151A825B004123FF /* PossiblyNull.h */; };
</del><span class="cx">                 A8A47414151A825B004123FF /* RandomNumber.cpp in Sources */ = {isa = PBXBuildFile; fileRef = A8A472FB151A825B004123FF /* RandomNumber.cpp */; };
</span><span class="cx">                 A8A47415151A825B004123FF /* RandomNumber.h in Headers */ = {isa = PBXBuildFile; fileRef = A8A472FC151A825B004123FF /* RandomNumber.h */; };
</span><span class="cx">                 A8A47416151A825B004123FF /* RandomNumberSeed.h in Headers */ = {isa = PBXBuildFile; fileRef = A8A472FD151A825B004123FF /* RandomNumberSeed.h */; };
</span><span class="lines">@@ -494,7 +493,6 @@
</span><span class="cx">                 A8A472E9151A825B004123FF /* ParallelJobsLibdispatch.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ParallelJobsLibdispatch.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 A8A472EC151A825B004123FF /* PassOwnPtr.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PassOwnPtr.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 A8A472ED151A825B004123FF /* PassRefPtr.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PassRefPtr.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><del>-                A8A472F3151A825B004123FF /* PossiblyNull.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PossiblyNull.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</del><span class="cx">                 A8A472FB151A825B004123FF /* RandomNumber.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = RandomNumber.cpp; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 A8A472FC151A825B004123FF /* RandomNumber.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RandomNumber.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="cx">                 A8A472FD151A825B004123FF /* RandomNumberSeed.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RandomNumberSeed.h; sourceTree = &quot;&lt;group&gt;&quot;; };
</span><span class="lines">@@ -821,7 +819,6 @@
</span><span class="cx">                                 93B1AA7F180E5AF3004A2F05 /* PassRef.h */,
</span><span class="cx">                                 A8A472ED151A825B004123FF /* PassRefPtr.h */,
</span><span class="cx">                                 A876DBD7151816E500DADB95 /* Platform.h */,
</span><del>-                                A8A472F3151A825B004123FF /* PossiblyNull.h */,
</del><span class="cx">                                 0F9D335D165DBA73005AD387 /* PrintStream.cpp */,
</span><span class="cx">                                 0F9D335E165DBA73005AD387 /* PrintStream.h */,
</span><span class="cx">                                 0FC4488216FE9FE100844BE9 /* ProcessID.h */,
</span><span class="lines">@@ -1158,7 +1155,6 @@
</span><span class="cx">                                 A8A4740B151A825B004123FF /* PassOwnPtr.h in Headers */,
</span><span class="cx">                                 A8A4740C151A825B004123FF /* PassRefPtr.h in Headers */,
</span><span class="cx">                                 A876DBD8151816E500DADB95 /* Platform.h in Headers */,
</span><del>-                                A8A4740F151A825B004123FF /* PossiblyNull.h in Headers */,
</del><span class="cx">                                 0FB14E19180FA218009B6B4D /* Bag.h in Headers */,
</span><span class="cx">                                 0F9D3363165DBA73005AD387 /* PrintStream.h in Headers */,
</span><span class="cx">                                 0FC4488316FE9FE100844BE9 /* ProcessID.h in Headers */,
</span></span></pre></div>
<a id="trunkSourceWTFwtfCMakeListstxt"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/wtf/CMakeLists.txt (180813 => 180814)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/wtf/CMakeLists.txt        2015-02-28 03:21:37 UTC (rev 180813)
+++ trunk/Source/WTF/wtf/CMakeLists.txt        2015-02-28 06:02:30 UTC (rev 180814)
</span><span class="lines">@@ -71,7 +71,6 @@
</span><span class="cx">     PassRef.h
</span><span class="cx">     PassRefPtr.h
</span><span class="cx">     Platform.h
</span><del>-    PossiblyNull.h
</del><span class="cx">     PrintStream.h
</span><span class="cx">     ProcessID.h
</span><span class="cx">     RAMSize.h
</span></span></pre></div>
<a id="trunkSourceWTFwtfFastMalloch"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/wtf/FastMalloc.h (180813 => 180814)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/wtf/FastMalloc.h        2015-02-28 03:21:37 UTC (rev 180813)
+++ trunk/Source/WTF/wtf/FastMalloc.h        2015-02-28 06:02:30 UTC (rev 180814)
</span><span class="lines">@@ -1,5 +1,5 @@
</span><span class="cx"> /*
</span><del>- *  Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
</del><ins>+ *  Copyright (C) 2005-2009, 2015 Apple Inc. All rights reserved.
</ins><span class="cx">  *
</span><span class="cx">  *  This library is free software; you can redistribute it and/or
</span><span class="cx">  *  modify it under the terms of the GNU Library General Public
</span><span class="lines">@@ -23,77 +23,79 @@
</span><span class="cx"> 
</span><span class="cx"> #include &lt;new&gt;
</span><span class="cx"> #include &lt;stdlib.h&gt;
</span><del>-#include &lt;wtf/PossiblyNull.h&gt;
</del><span class="cx"> #include &lt;wtf/StdLibExtras.h&gt;
</span><span class="cx"> 
</span><span class="cx"> namespace WTF {
</span><span class="cx"> 
</span><del>-    // These functions call CRASH() if an allocation fails.
-    WTF_EXPORT_PRIVATE void* fastMalloc(size_t);
-    WTF_EXPORT_PRIVATE void* fastZeroedMalloc(size_t);
-    WTF_EXPORT_PRIVATE void* fastCalloc(size_t numElements, size_t elementSize);
-    WTF_EXPORT_PRIVATE void* fastRealloc(void*, size_t);
-    WTF_EXPORT_PRIVATE char* fastStrDup(const char*);
-    WTF_EXPORT_PRIVATE size_t fastMallocSize(const void*);
-    WTF_EXPORT_PRIVATE size_t fastMallocGoodSize(size_t);
</del><ins>+class TryMallocReturnValue {
+public:
+    TryMallocReturnValue(void*);
+    TryMallocReturnValue(TryMallocReturnValue&amp;&amp;);
+    ~TryMallocReturnValue();
+    template&lt;typename T&gt; bool getValue(T*&amp;) WARN_UNUSED_RETURN;
+private:
+    void operator=(TryMallocReturnValue&amp;&amp;) = delete;
+    mutable void* m_data;
+};
</ins><span class="cx"> 
</span><del>-    // Allocations from fastAlignedMalloc() must be freed using fastAlignedFree().
-    WTF_EXPORT_PRIVATE void* fastAlignedMalloc(size_t alignment, size_t);
-    WTF_EXPORT_PRIVATE void fastAlignedFree(void*);
</del><ins>+// These functions call CRASH() if an allocation fails.
+WTF_EXPORT_PRIVATE void* fastMalloc(size_t);
+WTF_EXPORT_PRIVATE void* fastZeroedMalloc(size_t);
+WTF_EXPORT_PRIVATE void* fastCalloc(size_t numElements, size_t elementSize);
+WTF_EXPORT_PRIVATE void* fastRealloc(void*, size_t);
+WTF_EXPORT_PRIVATE char* fastStrDup(const char*);
</ins><span class="cx"> 
</span><del>-    struct TryMallocReturnValue {
-        TryMallocReturnValue(void* data)
-            : m_data(data)
-        {
-        }
-        TryMallocReturnValue(const TryMallocReturnValue&amp; source)
-            : m_data(source.m_data)
-        {
-            source.m_data = 0;
-        }
-        ~TryMallocReturnValue() { ASSERT(!m_data); }
-        template &lt;typename T&gt; bool getValue(T&amp; data) WARN_UNUSED_RETURN;
-        template &lt;typename T&gt; operator PossiblyNull&lt;T&gt;()
-        { 
-            T value; 
-            getValue(value); 
-            return PossiblyNull&lt;T&gt;(value);
-        } 
-    private:
-        mutable void* m_data;
-    };
-    
-    template &lt;typename T&gt; bool TryMallocReturnValue::getValue(T&amp; data)
-    {
-        union u { void* data; T target; } res;
-        res.data = m_data;
-        data = res.target;
-        bool returnValue = !!m_data;
-        m_data = 0;
-        return returnValue;
-    }
</del><ins>+WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastMalloc(size_t);
+TryMallocReturnValue tryFastZeroedMalloc(size_t);
+WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastCalloc(size_t numElements, size_t elementSize);
+WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastRealloc(void*, size_t);
</ins><span class="cx"> 
</span><del>-    WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastMalloc(size_t n);
-    TryMallocReturnValue tryFastZeroedMalloc(size_t n);
-    WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastCalloc(size_t n_elements, size_t element_size);
-    WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastRealloc(void* p, size_t n);
</del><ins>+WTF_EXPORT_PRIVATE void fastFree(void*);
</ins><span class="cx"> 
</span><del>-    WTF_EXPORT_PRIVATE void fastFree(void*);
</del><ins>+// Allocations from fastAlignedMalloc() must be freed using fastAlignedFree().
+WTF_EXPORT_PRIVATE void* fastAlignedMalloc(size_t alignment, size_t);
+WTF_EXPORT_PRIVATE void fastAlignedFree(void*);
</ins><span class="cx"> 
</span><del>-    WTF_EXPORT_PRIVATE void releaseFastMallocFreeMemory();
-    WTF_EXPORT_PRIVATE void releaseFastMallocFreeMemoryForThisThread();
-    
-    struct FastMallocStatistics {
-        size_t reservedVMBytes;
-        size_t committedVMBytes;
-        size_t freeListBytes;
-    };
-    WTF_EXPORT_PRIVATE FastMallocStatistics fastMallocStatistics();
</del><ins>+WTF_EXPORT_PRIVATE size_t fastMallocSize(const void*);
+WTF_EXPORT_PRIVATE size_t fastMallocGoodSize(size_t);
</ins><span class="cx"> 
</span><del>-    // This defines a type which holds an unsigned integer and is the same
-    // size as the minimally aligned memory allocation.
-    typedef unsigned long long AllocAlignmentInteger;
</del><ins>+WTF_EXPORT_PRIVATE void releaseFastMallocFreeMemory();
+WTF_EXPORT_PRIVATE void releaseFastMallocFreeMemoryForThisThread();
</ins><span class="cx"> 
</span><ins>+struct FastMallocStatistics {
+    size_t reservedVMBytes;
+    size_t committedVMBytes;
+    size_t freeListBytes;
+};
+WTF_EXPORT_PRIVATE FastMallocStatistics fastMallocStatistics();
+
+// This defines a type which holds an unsigned integer and is the same
+// size as the minimally aligned memory allocation.
+typedef unsigned long long AllocAlignmentInteger;
+
+inline TryMallocReturnValue::TryMallocReturnValue(void* data)
+    : m_data(data)
+{
+}
+
+inline TryMallocReturnValue::TryMallocReturnValue(TryMallocReturnValue&amp;&amp; source)
+    : m_data(source.m_data)
+{
+    source.m_data = nullptr;
+}
+
+inline TryMallocReturnValue::~TryMallocReturnValue()
+{
+    ASSERT(!m_data);
+}
+
+template&lt;typename T&gt; inline bool TryMallocReturnValue::getValue(T*&amp; data)
+{
+    data = static_cast&lt;T*&gt;(m_data);
+    m_data = nullptr;
+    return data;
+}
+
</ins><span class="cx"> } // namespace WTF
</span><span class="cx"> 
</span><span class="cx"> using WTF::fastCalloc;
</span></span></pre></div>
<a id="trunkSourceWTFwtfPossiblyNullh"></a>
<div class="delfile"><h4>Deleted: trunk/Source/WTF/wtf/PossiblyNull.h (180813 => 180814)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/wtf/PossiblyNull.h        2015-02-28 03:21:37 UTC (rev 180813)
+++ trunk/Source/WTF/wtf/PossiblyNull.h        2015-02-28 06:02:30 UTC (rev 180814)
</span><span class="lines">@@ -1,59 +0,0 @@
</span><del>-/*
- * Copyright (C) 2009 Apple Inc. All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef PossiblyNull_h
-#define PossiblyNull_h
-
-#include &lt;wtf/Assertions.h&gt;
-
-namespace WTF {
-
-template &lt;typename T&gt; struct PossiblyNull {
-    PossiblyNull(T data)
-        : m_data(data)
-    {
-    }
-    PossiblyNull(const PossiblyNull&lt;T&gt;&amp; source)
-        : m_data(source.m_data)
-    {
-        source.m_data = 0;
-    }
-    ~PossiblyNull() { ASSERT(!m_data); }
-    bool getValue(T&amp; out) WARN_UNUSED_RETURN;
-private:
-    mutable T m_data;
-};
-
-template &lt;typename T&gt; bool PossiblyNull&lt;T&gt;::getValue(T&amp; out)
-{
-    out = m_data;
-    bool result = !!m_data;
-    m_data = 0;
-    return result;
-}
-
-}
-
-#endif
</del></span></pre>
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