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/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#include <iostream>
#include <cstdlib>
#include "itkSmartPointer.h"
#include "itkMacro.h"
class itkTestObject
{
public:
using Pointer = itk::SmartPointer<itkTestObject>;
static itkTestObject::Pointer
New();
virtual void
Register()
{
std::cout << "Register " << *this << " count:" << (m_ReferenceCount + 1) << " " << std::endl;
m_ReferenceCount++;
}
virtual void
UnRegister()
{
std::cout << "UnRegister " << this << " count:" << (m_ReferenceCount - 1) << " " << std::endl;
m_ReferenceCount--;
if (m_ReferenceCount == 0)
{
delete this;
}
}
inline friend std::ostream &
operator<<(std::ostream & os, itkTestObject const & o)
{
os << "itkTestObject " << (void const *)&o << ' ' << o.m_ReferenceCount;
return os;
}
std::ostream &
Print(std::ostream & os) const
{
os << "itkTestObject " << (void const *)this << ' ' << this->m_ReferenceCount;
return os;
}
protected:
itkTestObject()
{
m_ReferenceCount = 0;
std::cout << "construct itkTestObject " << *this << std::endl;
}
virtual ~itkTestObject() { std::cout << "destruct itkTestObject " << *this << std::endl; }
private:
unsigned int m_ReferenceCount;
};
itkTestObject::Pointer
itkTestObject::New()
{
return itkTestObject::Pointer(new itkTestObject);
}
class itkTestObjectSubClass : public itkTestObject
{
public:
using Pointer = itk::SmartPointer<itkTestObjectSubClass>;
static Pointer
New();
};
itkTestObjectSubClass::Pointer
itkTestObjectSubClass::New()
{
return itkTestObjectSubClass::Pointer(new itkTestObjectSubClass);
}
// This SHOULD NOT be used in ITK, all functions
// should take raw pointers as arguments
void TestUpCastPointer(itkTestObject::Pointer) {}
// Test a function that takes an itkTestObject raw pointer
void
TestUpCast(itkTestObject *)
{}
int
itkSmartPointerTest(int, char *[])
{
// Create a base class pointer to a child class
itkTestObject::Pointer to(itkTestObjectSubClass::New());
// test the safe down cast and create a child class Pointer object
itkTestObjectSubClass::Pointer sc = dynamic_cast<itkTestObjectSubClass *>(to.GetPointer());
// Test the up cast with a function that takes a pointer
TestUpCast(sc);
// Test calling a function that takes a SmartPointer as
// an argument, note, that you have to get the raw pointer
// for this to work
TestUpCastPointer(sc.GetPointer());
// This will not work, but only in construction
// itkTestObject::Pointer p = sc;
// For construction use the constructor call:
// Test casting up the tree, note no explicit cast is required
itkTestObject::Pointer p(sc);
// No cast is required for assignment
p = sc;
std::cout << "second test" << std::endl;
{
auto o1 = itkTestObject::New();
std::cout << "o1 " << &o1 << std::endl;
auto o2 = itkTestObject::New();
std::cout << "o2 " << &o2 << std::endl;
auto o3 = itkTestObject::New();
std::cout << "o3 " << &o3 << std::endl;
auto o4 = itkTestObject::New();
std::cout << "o4 " << &o4 << std::endl;
o1 = o2;
o2 = o3;
o4 = o1;
if (o1 < o2)
{
std::cout << "o1 is < o2 " << o1 << ' ' << o2 << std::endl;
}
else
{
std::cout << "o1 is not < o2 " << &o1 << ' ' << &o2 << std::endl;
}
}
std::cout << "end second test" << std::endl << std::endl;
// check test of null pointer
itkTestObject::Pointer q(nullptr);
std::cout << q;
std::cout << "first test" << std::endl;
{
auto o1 = itkTestObject::New();
if (o1.IsNull())
{
return EXIT_FAILURE;
}
// use argument dependent loop up for swap in itk namespace
swap(q, o1);
}
std::cout << "end first test" << std::endl << std::endl;
return EXIT_SUCCESS;
}
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