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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/174660">174660</a></dd>
<dt>Author</dt> <dd>antti@apple.com</dd>
<dt>Date</dt> <dd>2014-10-13 15:30:20 -0700 (Mon, 13 Oct 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Add StringCapture helper for thread-safe lambda capture
https://bugs.webkit.org/show_bug.cgi?id=137664
Reviewed by Anders Carlsson.
There is currently no clean way to capture a String in a thread-safe manner. This will now work:
StringCapture stringCapture(string);
auto lambdaThatRunsInAnotherThread = [stringCapture] { String string = stringCapture.string(); ... }
This type won't be necessary with C++14 initialized lambda capture: [string = string.isolatedCopy()].
* wtf/text/WTFString.h:
(WTF::StringCapture::StringCapture): Create isolated copy in copy-constructor.
(WTF::StringCapture::string):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWTFChangeLog">trunk/Source/WTF/ChangeLog</a></li>
<li><a href="#trunkSourceWTFwtftextWTFStringh">trunk/Source/WTF/wtf/text/WTFString.h</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWTFChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/ChangeLog (174659 => 174660)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/ChangeLog 2014-10-13 21:58:30 UTC (rev 174659)
+++ trunk/Source/WTF/ChangeLog 2014-10-13 22:30:20 UTC (rev 174660)
</span><span class="lines">@@ -1,3 +1,21 @@
</span><ins>+2014-10-13 Antti Koivisto <antti@apple.com>
+
+ Add StringCapture helper for thread-safe lambda capture
+ https://bugs.webkit.org/show_bug.cgi?id=137664
+
+ Reviewed by Anders Carlsson.
+
+ There is currently no clean way to capture a String in a thread-safe manner. This will now work:
+
+ StringCapture stringCapture(string);
+ auto lambdaThatRunsInAnotherThread = [stringCapture] { String string = stringCapture.string(); ... }
+
+ This type won't be necessary with C++14 initialized lambda capture: [string = string.isolatedCopy()].
+
+ * wtf/text/WTFString.h:
+ (WTF::StringCapture::StringCapture): Create isolated copy in copy-constructor.
+ (WTF::StringCapture::string):
+
</ins><span class="cx"> 2014-10-11 KwangHyuk Kim <hyuki.kim@samsung.com>
</span><span class="cx">
</span><span class="cx"> [EFL] Enable WebP support.
</span></span></pre></div>
<a id="trunkSourceWTFwtftextWTFStringh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/wtf/text/WTFString.h (174659 => 174660)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/wtf/text/WTFString.h 2014-10-13 21:58:30 UTC (rev 174659)
+++ trunk/Source/WTF/wtf/text/WTFString.h 2014-10-13 22:30:20 UTC (rev 174660)
</span><span class="lines">@@ -634,6 +634,23 @@
</span><span class="cx"> const char* m_characters;
</span><span class="cx"> };
</span><span class="cx">
</span><ins>+// For thread-safe lambda capture:
+// StringCapture stringCapture(string);
+// auto lambdaThatRunsInOtherThread = [stringCapture] { String string = stringCapture.string(); ... }
+// FIXME: Remove when we can use C++14 initialized lambda capture: [string = string.isolatedCopy()].
+class StringCapture {
+public:
+ explicit StringCapture(const String& string) : m_string(string) { }
+ explicit StringCapture(String&& string) : m_string(string) { }
+ StringCapture(const StringCapture& other) : m_string(other.m_string.isolatedCopy()) { }
+ const String& string() const { return m_string; }
+ String releaseString() { return WTF::move(m_string); }
+
+private:
+ void operator=(const StringCapture&) = delete;
+ String m_string;
+};
+
</ins><span class="cx"> // Shared global empty string.
</span><span class="cx"> WTF_EXPORT_STRING_API const String& emptyString();
</span><span class="cx">
</span><span class="lines">@@ -664,6 +681,7 @@
</span><span class="cx"> using WTF::isSpaceOrNewline;
</span><span class="cx"> using WTF::reverseFind;
</span><span class="cx"> using WTF::ASCIILiteral;
</span><ins>+using WTF::StringCapture;
</ins><span class="cx">
</span><span class="cx"> #include <wtf/text/AtomicString.h>
</span><span class="cx"> #endif
</span></span></pre>
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