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// Copyright 2016 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/fxcrt/maybe_owned.h"
#include <memory>
#include <utility>
#include "core/fxcrt/unowned_ptr.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace fxcrt {
namespace {
class PseudoDeletable {
public:
explicit PseudoDeletable(int id, int* count_location)
: id_(id), count_location_(count_location) {}
~PseudoDeletable() { ++(*count_location_); }
int GetID() const { return id_; }
private:
int id_;
int* count_location_;
};
} // namespace
TEST(MaybeOwned, Null) {
MaybeOwned<PseudoDeletable> ptr1;
EXPECT_FALSE(ptr1.IsOwned());
EXPECT_FALSE(ptr1);
EXPECT_FALSE(ptr1.Get());
MaybeOwned<PseudoDeletable> ptr2;
EXPECT_TRUE(ptr1 == ptr2);
EXPECT_FALSE(ptr1 != ptr2);
}
TEST(MaybeOwned, NotOwned) {
int delete_count = 0;
PseudoDeletable thing1(100, &delete_count);
{
MaybeOwned<PseudoDeletable> ptr(&thing1);
EXPECT_FALSE(ptr.IsOwned());
EXPECT_EQ(ptr.Get(), &thing1);
EXPECT_EQ(100, ptr->GetID());
EXPECT_TRUE(ptr == &thing1);
EXPECT_FALSE(ptr != &thing1);
MaybeOwned<PseudoDeletable> empty;
EXPECT_FALSE(ptr == empty);
EXPECT_TRUE(ptr != empty);
}
EXPECT_EQ(0, delete_count);
delete_count = 0;
PseudoDeletable thing2(200, &delete_count);
{
MaybeOwned<PseudoDeletable> ptr(&thing1);
ptr = &thing2;
EXPECT_FALSE(ptr.IsOwned());
EXPECT_EQ(ptr.Get(), &thing2);
EXPECT_EQ(200, ptr->GetID());
}
EXPECT_EQ(0, delete_count);
delete_count = 0;
int owned_delete_count = 0;
{
MaybeOwned<PseudoDeletable> ptr(&thing1);
EXPECT_EQ(100, ptr->GetID());
ptr = std::make_unique<PseudoDeletable>(300, &owned_delete_count);
EXPECT_TRUE(ptr.IsOwned());
EXPECT_EQ(300, ptr->GetID());
}
EXPECT_EQ(0, delete_count);
EXPECT_EQ(1, owned_delete_count);
}
TEST(MaybeOwned, UnownedPtr) {
int delete_count = 0;
PseudoDeletable thing1(100, &delete_count);
PseudoDeletable thing2(200, &delete_count);
UnownedPtr<PseudoDeletable> unowned1(&thing1);
UnownedPtr<PseudoDeletable> unowned2(&thing2);
{
MaybeOwned<PseudoDeletable> ptr1(unowned1);
MaybeOwned<PseudoDeletable> ptr2(unowned2);
ptr2 = unowned1;
ptr1 = unowned2;
}
EXPECT_EQ(0, delete_count);
}
TEST(MaybeOwned, Owned) {
int delete_count = 0;
{
MaybeOwned<PseudoDeletable> ptr(
std::make_unique<PseudoDeletable>(100, &delete_count));
EXPECT_TRUE(ptr.IsOwned());
EXPECT_EQ(100, ptr->GetID());
MaybeOwned<PseudoDeletable> empty;
EXPECT_FALSE(ptr == empty);
EXPECT_TRUE(ptr != empty);
}
EXPECT_EQ(1, delete_count);
delete_count = 0;
{
MaybeOwned<PseudoDeletable> ptr(
std::make_unique<PseudoDeletable>(200, &delete_count));
ptr = std::make_unique<PseudoDeletable>(300, &delete_count);
EXPECT_TRUE(ptr.IsOwned());
EXPECT_EQ(300, ptr->GetID());
EXPECT_EQ(1, delete_count);
}
EXPECT_EQ(2, delete_count);
delete_count = 0;
int unowned_delete_count = 0;
PseudoDeletable thing2(400, &unowned_delete_count);
{
MaybeOwned<PseudoDeletable> ptr(
std::make_unique<PseudoDeletable>(500, &delete_count));
ptr = &thing2;
EXPECT_FALSE(ptr.IsOwned());
EXPECT_EQ(400, ptr->GetID());
EXPECT_EQ(1, delete_count);
EXPECT_EQ(0, unowned_delete_count);
}
EXPECT_EQ(1, delete_count);
EXPECT_EQ(0, unowned_delete_count);
}
TEST(MaybeOwned, Release) {
int delete_count = 0;
{
std::unique_ptr<PseudoDeletable> stolen;
{
MaybeOwned<PseudoDeletable> ptr(
std::make_unique<PseudoDeletable>(100, &delete_count));
EXPECT_TRUE(ptr.IsOwned());
stolen = ptr.Release();
EXPECT_FALSE(ptr.IsOwned());
EXPECT_EQ(ptr, stolen);
EXPECT_EQ(0, delete_count);
}
EXPECT_EQ(0, delete_count);
}
EXPECT_EQ(1, delete_count);
}
TEST(MaybeOwned, Move) {
int delete_count = 0;
PseudoDeletable thing1(100, &delete_count);
{
MaybeOwned<PseudoDeletable> ptr1(&thing1);
MaybeOwned<PseudoDeletable> ptr2(
std::make_unique<PseudoDeletable>(200, &delete_count));
EXPECT_FALSE(ptr1.IsOwned());
EXPECT_TRUE(ptr2.IsOwned());
MaybeOwned<PseudoDeletable> ptr3(std::move(ptr1));
MaybeOwned<PseudoDeletable> ptr4(std::move(ptr2));
EXPECT_FALSE(ptr1.IsOwned()); // Unowned and null.
EXPECT_FALSE(ptr1.Get());
EXPECT_TRUE(ptr2.IsOwned()); // Owned but null.
EXPECT_FALSE(ptr2.Get());
EXPECT_FALSE(ptr3.IsOwned());
EXPECT_TRUE(ptr4.IsOwned());
EXPECT_EQ(0, delete_count);
EXPECT_EQ(100, ptr3->GetID());
EXPECT_EQ(200, ptr4->GetID());
MaybeOwned<PseudoDeletable> ptr5;
MaybeOwned<PseudoDeletable> ptr6;
ptr5 = std::move(ptr3);
ptr6 = std::move(ptr4);
EXPECT_FALSE(ptr3.IsOwned()); // Unowned and null.
EXPECT_FALSE(ptr3.Get());
EXPECT_TRUE(ptr4.IsOwned()); // Owned but null.
EXPECT_FALSE(ptr4.Get());
EXPECT_FALSE(ptr5.IsOwned());
EXPECT_TRUE(ptr6.IsOwned());
EXPECT_EQ(0, delete_count);
EXPECT_EQ(100, ptr5->GetID());
EXPECT_EQ(200, ptr6->GetID());
}
EXPECT_EQ(1, delete_count);
}
namespace {
class Thing {
public:
int x = 42;
};
class Owner {
public:
explicit Owner(std::unique_ptr<Thing> thing) : thing_(std::move(thing)) {}
private:
std::unique_ptr<Thing> thing_;
};
class Manager {
public:
Manager()
: transient_(std::make_unique<Thing>()),
owner_(std::make_unique<Owner>(transient_.Release())),
thing_(std::move(transient_).Get()) {}
bool has_transient() const { return !!transient_.Get(); }
private:
MaybeOwned<Thing> transient_; // For initializng next two members.
const std::unique_ptr<Owner> owner_; // Must outlive thing_.
const UnownedPtr<Thing> thing_;
};
} // namespace
TEST(MaybeOwned, MoveElisionThwarted) {
// Test fails if the std::move() in Manager::Manager() is elided.
Manager manager;
EXPECT_FALSE(manager.has_transient());
}
} // namespace fxcrt
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