third_party/WebKit/Source/platform/CrossThreadCopier.cpp

   1 /*
   2  * Copyright (C) 2009 Google Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
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   8  *     * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32
  33 #include "platform/CrossThreadCopier.h"
  34
  35 #include "platform/network/ResourceError.h"
  36 #include "platform/network/ResourceRequest.h"
  37 #include "platform/network/ResourceResponse.h"
  38 #include "platform/weborigin/KURL.h"
  39 #include "wtf/text/WTFString.h"
  40
  41 namespace blink {
  42
  43 CrossThreadCopierBase<false, false, false, KURL>::Type CrossThreadCopierBase<false, false, false, KURL>::copy(const KURL& url)
  44 {
  45     return url.copy();
  46 }
  47
  48 CrossThreadCopierBase<false, false, false, String>::Type CrossThreadCopierBase<false, false, false, String>::copy(const String& str)
  49 {
  50     return str.isolatedCopy();
  51 }
  52
  53 CrossThreadCopierBase<false, false, false, ResourceError>::Type CrossThreadCopierBase<false, false, false, ResourceError>::copy(const ResourceError& error)
  54 {
  55     return error.copy();
  56 }
  57
  58 CrossThreadCopierBase<false, false, false, ResourceRequest>::Type CrossThreadCopierBase<false, false, false, ResourceRequest>::copy(const ResourceRequest& request)
  59 {
  60     return request.copyData();
  61 }
  62
  63 CrossThreadCopierBase<false, false, false, ResourceResponse>::Type CrossThreadCopierBase<false, false, false, ResourceResponse>::copy(const ResourceResponse& response)
  64 {
  65     return response.copyData();
  66 }
  67
  68 // Test CrossThreadCopier using static_assert.
  69
  70 // Verify that ThreadSafeRefCounted objects get handled correctly.
  71 class CopierThreadSafeRefCountedTest : public ThreadSafeRefCounted<CopierThreadSafeRefCountedTest> {
  72 };
  73
  74 static_assert((WTF::IsSameType<
  75     PassRefPtr<CopierThreadSafeRefCountedTest>,
  76     CrossThreadCopier<PassRefPtr<CopierThreadSafeRefCountedTest>>::Type
  77     >::value),
  78     "PassRefPtr test");
  79 static_assert((WTF::IsSameType<
  80     PassRefPtr<CopierThreadSafeRefCountedTest>,
  81     CrossThreadCopier<RefPtr<CopierThreadSafeRefCountedTest>>::Type
  82     >::value),
  83     "RefPtr test");
  84 static_assert((WTF::IsSameType<
  85     PassRefPtr<CopierThreadSafeRefCountedTest>,
  86     CrossThreadCopier<CopierThreadSafeRefCountedTest*>::Type
  87     >::value),
  88     "RawPointer test");
  89
  90
  91 // Add a generic specialization which will let's us verify that no other template matches.
  92 template<typename T> struct CrossThreadCopierBase<false, false, false, T> {
  93     typedef int Type;
  94 };
  95
  96 // Verify that RefCounted objects only match our generic template which exposes Type as int.
  97 class CopierRefCountedTest : public RefCounted<CopierRefCountedTest> {
  98 };
  99
 100 static_assert((WTF::IsSameType<
 101     int,
 102     CrossThreadCopier<PassRefPtr<CopierRefCountedTest>>::Type
 103     >::value),
 104     "PassRefPtr<RefCountedTest> test");
 105
 106 static_assert((WTF::IsSameType<
 107     int,
 108     CrossThreadCopier<RefPtr<CopierRefCountedTest>>::Type
 109     >::value),
 110     "RefPtr<RefCounted> test");
 111
 112 static_assert((WTF::IsSameType<
 113     int,
 114     CrossThreadCopier<CopierRefCountedTest*>::Type
 115     >::value),
 116     "Raw pointer RefCounted test");
 117
 118 // Verify that PassOwnPtr gets passed through.
 119 static_assert((WTF::IsSameType<
 120     PassOwnPtr<float>,
 121     CrossThreadCopier<PassOwnPtr<float>>::Type
 122     >::value),
 123     "PassOwnPtr test");
 124
 125 // Verify that PassOwnPtr does not get passed through.
 126 static_assert((WTF::IsSameType<
 127     int,
 128     CrossThreadCopier<OwnPtr<float>>::Type
 129     >::value),
 130     "OwnPtr test");
 131
 132 } // namespace blink