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// 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/callback.h"
#include <memory>
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/callback_internal.h"
#include "base/memory/ref_counted.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
void NopInvokeFunc() {}
// White-box testpoints to inject into a Callback<> object for checking
// comparators and emptiness APIs. Use a BindState that is specialized
// based on a type we declared in the anonymous namespace above to remove any
// chance of colliding with another instantiation and breaking the
// one-definition-rule.
struct FakeBindState1 : internal::BindStateBase {
FakeBindState1() : BindStateBase(&NopInvokeFunc, &Destroy, &IsCancelled) {}
private:
~FakeBindState1() {}
static void Destroy(const internal::BindStateBase* self) {
delete static_cast<const FakeBindState1*>(self);
}
static bool IsCancelled(const internal::BindStateBase*) {
return false;
}
};
struct FakeBindState2 : internal::BindStateBase {
FakeBindState2() : BindStateBase(&NopInvokeFunc, &Destroy, &IsCancelled) {}
private:
~FakeBindState2() {}
static void Destroy(const internal::BindStateBase* self) {
delete static_cast<const FakeBindState2*>(self);
}
static bool IsCancelled(const internal::BindStateBase*) {
return false;
}
};
namespace {
class CallbackTest : public ::testing::Test {
public:
CallbackTest()
: callback_a_(new FakeBindState1()),
callback_b_(new FakeBindState2()) {
}
~CallbackTest() override {}
protected:
Callback<void()> callback_a_;
const Callback<void()> callback_b_; // Ensure APIs work with const.
Callback<void()> null_callback_;
};
// Ensure we can create unbound callbacks. We need this to be able to store
// them in class members that can be initialized later.
TEST_F(CallbackTest, DefaultConstruction) {
Callback<void()> c0;
Callback<void(int)> c1;
Callback<void(int,int)> c2;
Callback<void(int,int,int)> c3;
Callback<void(int,int,int,int)> c4;
Callback<void(int,int,int,int,int)> c5;
Callback<void(int,int,int,int,int,int)> c6;
EXPECT_TRUE(c0.is_null());
EXPECT_TRUE(c1.is_null());
EXPECT_TRUE(c2.is_null());
EXPECT_TRUE(c3.is_null());
EXPECT_TRUE(c4.is_null());
EXPECT_TRUE(c5.is_null());
EXPECT_TRUE(c6.is_null());
}
TEST_F(CallbackTest, IsNull) {
EXPECT_TRUE(null_callback_.is_null());
EXPECT_FALSE(callback_a_.is_null());
EXPECT_FALSE(callback_b_.is_null());
}
TEST_F(CallbackTest, Equals) {
EXPECT_TRUE(callback_a_.Equals(callback_a_));
EXPECT_FALSE(callback_a_.Equals(callback_b_));
EXPECT_FALSE(callback_b_.Equals(callback_a_));
// We should compare based on instance, not type.
Callback<void()> callback_c(new FakeBindState1());
Callback<void()> callback_a2 = callback_a_;
EXPECT_TRUE(callback_a_.Equals(callback_a2));
EXPECT_FALSE(callback_a_.Equals(callback_c));
// Empty, however, is always equal to empty.
Callback<void()> empty2;
EXPECT_TRUE(null_callback_.Equals(empty2));
}
TEST_F(CallbackTest, Reset) {
// Resetting should bring us back to empty.
ASSERT_FALSE(callback_a_.is_null());
ASSERT_FALSE(callback_a_.Equals(null_callback_));
callback_a_.Reset();
EXPECT_TRUE(callback_a_.is_null());
EXPECT_TRUE(callback_a_.Equals(null_callback_));
}
TEST_F(CallbackTest, Move) {
// Moving should reset the callback.
ASSERT_FALSE(callback_a_.is_null());
ASSERT_FALSE(callback_a_.Equals(null_callback_));
auto tmp = std::move(callback_a_);
EXPECT_TRUE(callback_a_.is_null());
EXPECT_TRUE(callback_a_.Equals(null_callback_));
}
struct TestForReentrancy {
TestForReentrancy()
: cb_already_run(false),
cb(Bind(&TestForReentrancy::AssertCBIsNull, Unretained(this))) {
}
void AssertCBIsNull() {
ASSERT_TRUE(cb.is_null());
cb_already_run = true;
}
bool cb_already_run;
Closure cb;
};
TEST_F(CallbackTest, ResetAndReturn) {
TestForReentrancy tfr;
ASSERT_FALSE(tfr.cb.is_null());
ASSERT_FALSE(tfr.cb_already_run);
ResetAndReturn(&tfr.cb).Run();
ASSERT_TRUE(tfr.cb.is_null());
ASSERT_TRUE(tfr.cb_already_run);
}
class CallbackOwner : public base::RefCounted<CallbackOwner> {
public:
explicit CallbackOwner(bool* deleted) {
callback_ = Bind(&CallbackOwner::Unused, this);
deleted_ = deleted;
}
void Reset() {
callback_.Reset();
// We are deleted here if no-one else had a ref to us.
}
private:
friend class base::RefCounted<CallbackOwner>;
virtual ~CallbackOwner() {
*deleted_ = true;
}
void Unused() {
FAIL() << "Should never be called";
}
Closure callback_;
bool* deleted_;
};
TEST_F(CallbackTest, CallbackHasLastRefOnContainingObject) {
bool deleted = false;
CallbackOwner* owner = new CallbackOwner(&deleted);
owner->Reset();
ASSERT_TRUE(deleted);
}
} // namespace
} // namespace base
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