cpp_week_ptr - 8BitsCoding/RobotMentor GitHub Wiki

#include <memory>
#include "Person.h"

int main() {
    std::shared_ptr<Person> owner = std::make_shared<Person>("Pope");
    std::weak_ptr<Person> weakOwner = owner;

    // strong ref 1, weak ref 1이 된다.

    return 0;
}

#include <memory>
#include "Person.h"

int main() {
    std::shared_ptr<Person> owner = std::make_shared<Person>("Pope");
    std::weak_ptr<Person> weakOwner = owner;

    std::shared_ptr<Person> lockedOwner = weakOwer.lock();
    // 사용시에는 shared_ptr로 사용해야하고 lock함수를 써서 share_ptr로 전달

    return 0;
}

#include <memory>
#include "Person.h"

int main() {
    std::shared_ptr<Person> owner = std::make_shared<Person>("Pope");
    std::weak_ptr<Person> weakOwner = owner;

    auto ptr = weakOwner.lock();

    if(ptr == nullptr)
    {
        // 이미 지워졌으면 여기로 들오겠지?
    }
}

#include <memory>
#include "Person.h"

int main() {
    std::shared_ptr<Person> owner = std::make_shared<Person>("Pope");
    std::weak_ptr<Person> weakOwner = owner;

    if(weakOwner.expired())     // false

#include <memory>
#include "Person.h"

int main() {
    std::shared_ptr<Person> owner = std::make_shared<Person>("Pope");
    std::weak_ptr<Person> weakOwner = owner;

    owner = nullptr;

    if(weakOwner.expired())     // true

// 둘 중 하나는 약한참조를 갖자
class Pet
{
public:
    void SetPet(const std::shared_ptr<Pet>& pet);
    // ...
private:
    std::shared_ptr<Pet> mPet;
}

class Person
{
public:
    void SetOwner(const std::shared_ptr<Person>& owner);
    // ...
private:
    std::weak_ptr<Person> mOwner;
}