如何从向量<shared_ptr>中删除元素

Question

我使用以下代码建立一种注册表类:

class MyClass 
{
    public:
       int a;
       std::string b;
};

class Register
{
    public:
        std::vector<std::shared_ptr<MyClass>> items;

        bool registerItem(std::shared_ptr<MyClass> item)
        {
            /*
             * Check if item exists
             */
            auto position = std::find(items.begin(), items.end(), item);

            if (position != items.end())
                return false;

            items.push_back(item);

            return true;
        }

         bool unregisterItem(std::shared_ptr<MyClass> item)
        {
            auto position = std::find(items.begin(), items.end(), item);

            if (position == items.end())
               return false;

            items.erase(item);

            return true;
        }
};


int main()
{
    std::shared_ptr<MyClass> item1 = new MyClass;

    Register registry;

    if (!registry.registerItem(item1))
        std::cout << "Error registering item1" << std::endl;
    else
        std::cout << "Success registering item1" << std::endl;

    if (!registry.registerItem(item1))
        std::cout << "Error unregistering item1" << std::endl;
    else
        std::cout << "Success unregistering item1" << std::endl;
}

items.erase(item)抱怨,我无法编译这段代码error: no matching member function for call to 'erase'.

为什么我不能删除我添加的对象.std::shared_ptr从a中删除a的正确方法是std::vector什么？

Answer 1

因为你想使用迭代器items(即 position),所以:

items.erase(position);