Specialize base::IsWeakReceiver for Blink weak pointers to support base::Bind (1/5)

third_party/WebKit/Source/wtf/FunctionalTest.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
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  * modification, are permitted provided that the following conditions
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  * 1. Redistributions of source code must retain the above copyright
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  * 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 ITS CONTRIBUTORS
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  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 #include "wtf/Functional.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/RefCounted.h"
+#include "wtf/WeakPtr.h"
 #include <utility>
 
 namespace WTF {
 
 class UnwrappedClass {
 public:
     explicit UnwrappedClass(int value)
         : m_value(value)
     {
     }
@@ skipping 31 matching lines @@
 private:
     int m_value;
 };
 
 template<> struct ParamStorageTraits<ClassToBeWrapped> {
     using StorageType = WrappedClass;
     static StorageType wrap(const ClassToBeWrapped& value) { return value.wrap(); }
     static UnwrappedClass unwrap(const StorageType& value) { return value.unwrap(); }
 };
 
+class HasWeakPtrSupport {
+public:
+    HasWeakPtrSupport() : m_weakPtrFactory(this) {}
+
+    WTF::WeakPtr<HasWeakPtrSupport> createWeakPtr() {
+        return m_weakPtrFactory.createWeakPtr();
+    }
+
+    void revokeAll()
+    {
+        m_weakPtrFactory.revokeAll();
+    }
+
+    void increment(int* counter)
+    {
+        ++*counter;
+    }
+
+private:
+    WTF::WeakPtrFactory<HasWeakPtrSupport> m_weakPtrFactory;
+};
+
 namespace {
 
 int returnFortyTwo()
 {
     return 42;
 }
 
 TEST(FunctionalTest, Basic)
 {
     std::unique_ptr<Function<int()>> returnFortyTwoFunction = bind(returnFortyTwo);
@@ skipping 443 matching lines @@
     CountCopy lvalue;
     std::unique_ptr<Function<int(const CountCopy&)>> bound1 = bind(takeCountCopyAsConstReference);
     EXPECT_EQ(0, (*bound1)(lvalue)); // No copies!
     EXPECT_EQ(0, (*bound1)(CountCopy()));
 
     std::unique_ptr<Function<int(CountCopy)>> bound2 = bind(takeCountCopyAsValue);
     EXPECT_EQ(2, (*bound2)(lvalue)); // At PartBoundFunctionImpl::operator() and at the destination function.
     EXPECT_LE((*bound2)(CountCopy()), 2); // Compiler is allowed to optimize one copy away if the argument is rvalue.
 }
 
+TEST(FunctionalTest, WeakPtr)
+{
+    HasWeakPtrSupport obj;
+    int counter = 0;
+    std::unique_ptr<WTF::SameThreadClosure> bound = WTF::bind(&HasWeakPtrSupport::increment, obj.createWeakPtr(), WTF::unretained(&counter));
+
+    (*bound)();
+    EXPECT_EQ(1, counter);
+
+    obj.revokeAll();
+    (*bound)();
+    EXPECT_EQ(1, counter);
+}
+
 } // anonymous namespace
 
 } // namespace WTF