Disassociate argument type from return type in PostTaskAndReplyWithResult template.

base/task_runner_util_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/task_runner_util.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
 
 int ReturnFourtyTwo() {
   return 42;
 }
 
 void StoreValue(int* destination, int value) {
   *destination = value;
 }
 
+void StoreDoubleValue(double* destination, double value) {
+  *destination = value;
+}
+
 int g_foo_destruct_count = 0;
 int g_foo_free_count = 0;
 
 struct Foo {
   ~Foo() {
     ++g_foo_destruct_count;
   }
 };
 
 scoped_ptr<Foo> CreateFoo() {
@@ skipping 35 matching lines @@
       message_loop.message_loop_proxy(),
       FROM_HERE,
       Bind(&ReturnFourtyTwo),
       Bind(&StoreValue, &result));
 
   message_loop.RunUntilIdle();
 
   EXPECT_EQ(42, result);
 }
 
+TEST(TaskRunnerHelpersTest, PostTaskAndReplyWithResultImplicitConvert) {
+  MessageLoop message_loop;
+  double result = 0;
+
+  PostTaskAndReplyWithResult(
+      message_loop.message_loop_proxy(),
+      FROM_HERE,
+      Bind(&ReturnFourtyTwo),
+      Bind(&StoreDoubleValue, &result));
+
+  message_loop.RunUntilIdle();
+
+  EXPECT_DOUBLE_EQ(42.0, result);
+}
+
 TEST(TaskRunnerHelpersTest, PostTaskAndReplyWithResultPassed) {
   g_foo_destruct_count = 0;
   g_foo_free_count = 0;
 
   MessageLoop message_loop;
 
   PostTaskAndReplyWithResult(
       message_loop.message_loop_proxy(),
       FROM_HERE,
       Bind(&CreateFoo),
@@ skipping 17 matching lines @@
       Bind(&CreateScopedFoo),
       Bind(&ExpectScopedFoo));
 
   message_loop.RunUntilIdle();
 
   EXPECT_EQ(1, g_foo_destruct_count);
   EXPECT_EQ(1, g_foo_free_count);
 }
 
 }  // namespace base