forked from Mirrorlandia_minetest/minetest
Add Irrlicht-specific smart pointer (#6814)
This commit is contained in:
Vitaliy
rubenwardy
parent
bb7afd306a
commit
faa419fc8b
137
src/irr_ptr.h
Normal file
137
src/irr_ptr.h
Normal file
@ -0,0 +1,137 @@
|
||||
/*
|
||||
Minetest
|
||||
Copyright (C) 2018 numzero, Lobachevskiy Vitaliy <numzer0@yandex.ru>
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU Lesser General Public License as published by
|
||||
the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public License along
|
||||
with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
#include <type_traits>
|
||||
#include "irrlichttypes.h"
|
||||
#include "IReferenceCounted.h"
|
||||
|
||||
/** Shared pointer for IrrLicht objects.
|
||||
*
|
||||
* It should only be used for user-managed objects, i.e. those created with
|
||||
* the @c new operator or @c create* functions, like:
|
||||
* `irr_ptr<scene::IMeshBuffer> buf{new scene::SMeshBuffer()};`
|
||||
*
|
||||
* It should *never* be used for engine-managed objects, including
|
||||
* those created with @c addTexture and similar methods.
|
||||
*/
|
||||
template <class ReferenceCounted,
|
||||
class = typename std::enable_if<std::is_base_of<IReferenceCounted,
|
||||
ReferenceCounted>::value>::type>
|
||||
class irr_ptr
|
||||
{
|
||||
ReferenceCounted *value = nullptr;
|
||||
|
||||
/** Drops stored pointer replacing it with the given one.
|
||||
* @note Copy semantics: reference counter *is* increased.
|
||||
*/
|
||||
void grab(ReferenceCounted *object)
|
||||
{
|
||||
if (object)
|
||||
object->grab();
|
||||
reset(object);
|
||||
}
|
||||
|
||||
public:
|
||||
irr_ptr() {}
|
||||
|
||||
irr_ptr(std::nullptr_t) noexcept {}
|
||||
|
||||
irr_ptr(const irr_ptr &b) noexcept { grab(b.get()); }
|
||||
|
||||
irr_ptr(irr_ptr &&b) noexcept { reset(b.release()); }
|
||||
|
||||
template <typename B, class = typename std::enable_if<std::is_convertible<B *,
|
||||
ReferenceCounted *>::value>::type>
|
||||
irr_ptr(const irr_ptr<B> &b) noexcept
|
||||
{
|
||||
grab(b.get());
|
||||
}
|
||||
|
||||
template <typename B, class = typename std::enable_if<std::is_convertible<B *,
|
||||
ReferenceCounted *>::value>::type>
|
||||
irr_ptr(irr_ptr<B> &&b) noexcept
|
||||
{
|
||||
reset(b.release());
|
||||
}
|
||||
|
||||
/** Constructs a shared pointer out of a plain one
|
||||
* @note Move semantics: reference counter is *not* increased.
|
||||
*/
|
||||
explicit irr_ptr(ReferenceCounted *object) noexcept { reset(object); }
|
||||
|
||||
~irr_ptr() { reset(); }
|
||||
|
||||
irr_ptr &operator=(const irr_ptr &b) noexcept
|
||||
{
|
||||
grab(b.get());
|
||||
return *this;
|
||||
}
|
||||
|
||||
irr_ptr &operator=(irr_ptr &&b) noexcept
|
||||
{
|
||||
reset(b.release());
|
||||
return *this;
|
||||
}
|
||||
|
||||
template <typename B, class = typename std::enable_if<std::is_convertible<B *,
|
||||
ReferenceCounted *>::value>::type>
|
||||
irr_ptr &operator=(const irr_ptr<B> &b) noexcept
|
||||
{
|
||||
grab(b.get());
|
||||
return *this;
|
||||
}
|
||||
|
||||
template <typename B, class = typename std::enable_if<std::is_convertible<B *,
|
||||
ReferenceCounted *>::value>::type>
|
||||
irr_ptr &operator=(irr_ptr<B> &&b) noexcept
|
||||
{
|
||||
reset(b.release());
|
||||
return *this;
|
||||
}
|
||||
|
||||
ReferenceCounted &operator*() const noexcept { return *value; }
|
||||
ReferenceCounted *operator->() const noexcept { return value; }
|
||||
explicit operator ReferenceCounted *() const noexcept { return value; }
|
||||
explicit operator bool() const noexcept { return !!value; }
|
||||
|
||||
/** Returns the stored pointer.
|
||||
*/
|
||||
ReferenceCounted *get() const noexcept { return value; }
|
||||
|
||||
/** Returns the stored pointer, erasing it from this class.
|
||||
* @note Move semantics: reference counter is not changed.
|
||||
*/
|
||||
ReferenceCounted *release() noexcept
|
||||
{
|
||||
ReferenceCounted *object = value;
|
||||
value = nullptr;
|
||||
return object;
|
||||
}
|
||||
|
||||
/** Drops stored pointer replacing it with the given one.
|
||||
* @note Move semantics: reference counter is *not* increased.
|
||||
*/
|
||||
void reset(ReferenceCounted *object = nullptr) noexcept
|
||||
{
|
||||
if (value)
|
||||
value->drop();
|
||||
value = object;
|
||||
}
|
||||
};
|
||||
@ -10,6 +10,7 @@ set (UNITTEST_SRCS
|
||||
${CMAKE_CURRENT_SOURCE_DIR}/test_connection.cpp
|
||||
${CMAKE_CURRENT_SOURCE_DIR}/test_filepath.cpp
|
||||
${CMAKE_CURRENT_SOURCE_DIR}/test_inventory.cpp
|
||||
${CMAKE_CURRENT_SOURCE_DIR}/test_irrptr.cpp
|
||||
${CMAKE_CURRENT_SOURCE_DIR}/test_map_settings_manager.cpp
|
||||
${CMAKE_CURRENT_SOURCE_DIR}/test_mapnode.cpp
|
||||
${CMAKE_CURRENT_SOURCE_DIR}/test_modchannels.cpp
|
||||
|
||||
131
src/unittest/test_irrptr.cpp
Normal file
131
src/unittest/test_irrptr.cpp
Normal file
@ -0,0 +1,131 @@
|
||||
/*
|
||||
Minetest
|
||||
Copyright (C) 2018 numzero, Lobachevskiy Vitaliy <numzer0@yandex.ru>
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU Lesser General Public License as published by
|
||||
the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public License along
|
||||
with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
*/
|
||||
|
||||
#include "test.h"
|
||||
|
||||
#include "exceptions.h"
|
||||
#include "irr_ptr.h"
|
||||
|
||||
class TestIrrPtr : public TestBase
|
||||
{
|
||||
public:
|
||||
TestIrrPtr() { TestManager::registerTestModule(this); }
|
||||
const char *getName() { return "TestIrrPtr"; }
|
||||
|
||||
void runTests(IGameDef *gamedef);
|
||||
|
||||
void testRefCounting();
|
||||
void testSelfAssignment();
|
||||
void testNullHandling();
|
||||
};
|
||||
|
||||
static TestIrrPtr g_test_instance;
|
||||
|
||||
void TestIrrPtr::runTests(IGameDef *gamedef)
|
||||
{
|
||||
TEST(testRefCounting);
|
||||
TEST(testSelfAssignment);
|
||||
TEST(testNullHandling);
|
||||
}
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
#define UASSERT_REFERENCE_COUNT(object, value, info) \
|
||||
UTEST((object)->getReferenceCount() == value, \
|
||||
info "Reference count is %d instead of " #value, \
|
||||
(object)->getReferenceCount())
|
||||
|
||||
void TestIrrPtr::testRefCounting()
|
||||
{
|
||||
IReferenceCounted *obj = new IReferenceCounted(); // RC=1
|
||||
obj->grab();
|
||||
UASSERT_REFERENCE_COUNT(obj, 2, "Pre-condition failed: ");
|
||||
{
|
||||
irr_ptr<IReferenceCounted> p1{obj}; // move semantics
|
||||
UASSERT(p1.get() == obj);
|
||||
UASSERT_REFERENCE_COUNT(obj, 2, );
|
||||
|
||||
irr_ptr<IReferenceCounted> p2{p1}; // copy ctor
|
||||
UASSERT(p1.get() == obj);
|
||||
UASSERT(p2.get() == obj);
|
||||
UASSERT_REFERENCE_COUNT(obj, 3, );
|
||||
|
||||
irr_ptr<IReferenceCounted> p3{std::move(p1)}; // move ctor
|
||||
UASSERT(p1.get() == nullptr);
|
||||
UASSERT(p3.get() == obj);
|
||||
UASSERT_REFERENCE_COUNT(obj, 3, );
|
||||
|
||||
p1 = std::move(p2); // move assignment
|
||||
UASSERT(p1.get() == obj);
|
||||
UASSERT(p2.get() == nullptr);
|
||||
UASSERT_REFERENCE_COUNT(obj, 3, );
|
||||
|
||||
p2 = p3; // copy assignment
|
||||
UASSERT(p2.get() == obj);
|
||||
UASSERT(p3.get() == obj);
|
||||
UASSERT_REFERENCE_COUNT(obj, 4, );
|
||||
|
||||
p1.release();
|
||||
UASSERT(p1.get() == nullptr);
|
||||
UASSERT_REFERENCE_COUNT(obj, 4, );
|
||||
}
|
||||
UASSERT_REFERENCE_COUNT(obj, 2, );
|
||||
obj->drop();
|
||||
UTEST(obj->drop(), "Dropping failed: reference count is %d",
|
||||
obj->getReferenceCount());
|
||||
}
|
||||
|
||||
void TestIrrPtr::testSelfAssignment()
|
||||
{
|
||||
irr_ptr<IReferenceCounted> p1{new IReferenceCounted()};
|
||||
UASSERT(p1);
|
||||
UASSERT_REFERENCE_COUNT(p1, 1, );
|
||||
p1 = p1;
|
||||
UASSERT(p1);
|
||||
UASSERT_REFERENCE_COUNT(p1, 1, );
|
||||
p1 = std::move(p1);
|
||||
UASSERT(p1);
|
||||
UASSERT_REFERENCE_COUNT(p1, 1, );
|
||||
}
|
||||
|
||||
void TestIrrPtr::testNullHandling()
|
||||
{
|
||||
// In the case of an error, it will probably crash with SEGV.
|
||||
// Nevertheless, UASSERTs are used to catch possible corner cases.
|
||||
irr_ptr<IReferenceCounted> p1{new IReferenceCounted()};
|
||||
UASSERT(p1);
|
||||
irr_ptr<IReferenceCounted> p2;
|
||||
UASSERT(!p2);
|
||||
irr_ptr<IReferenceCounted> p3{p2};
|
||||
UASSERT(!p2);
|
||||
UASSERT(!p3);
|
||||
irr_ptr<IReferenceCounted> p4{std::move(p2)};
|
||||
UASSERT(!p2);
|
||||
UASSERT(!p4);
|
||||
p2 = p2;
|
||||
UASSERT(!p2);
|
||||
p2 = std::move(p2);
|
||||
UASSERT(!p2);
|
||||
p3 = p2;
|
||||
UASSERT(!p2);
|
||||
UASSERT(!p3);
|
||||
p3 = std::move(p2);
|
||||
UASSERT(!p2);
|
||||
UASSERT(!p3);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user