Add an explicit bool conversion to scoped_refptr<T>.

base/memory/ref_counted_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/memory/ref_counted.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 class SelfAssign : public base::RefCounted<SelfAssign> {
@@ skipping 42 matching lines @@
 TEST(RefCountedUnitTest, ScopedRefPtrMemberAccess) {
   CheckDerivedMemberAccess check;
 }
 
 TEST(RefCountedUnitTest, ScopedRefPtrToSelf) {
   ScopedRefPtrToSelf* check = new ScopedRefPtrToSelf();
   EXPECT_FALSE(ScopedRefPtrToSelf::was_destroyed());
   check->SelfDestruct();
   EXPECT_TRUE(ScopedRefPtrToSelf::was_destroyed());
 }
+
+TEST(RefCountedUnitTest, ScopedRefPtrBooleanOperations) {
+  scoped_refptr<SelfAssign> p1 = new SelfAssign;
+  scoped_refptr<SelfAssign> p2;
+  EXPECT_TRUE(p1);
+  EXPECT_FALSE(!p1);
+  EXPECT_TRUE(!p2);
+  EXPECT_FALSE(p2);
+  EXPECT_NE(p1, p2);
+  SelfAssign* raw_p = new SelfAssign;
+  p2 = raw_p;
+  EXPECT_NE(p1, p2);
+  EXPECT_EQ(raw_p, p2);
+  p2 = p1;
+  EXPECT_NE(raw_p, p2);
+  EXPECT_EQ(p1, p2);
+}