分配给std :: shared_ptr成员变量

Question

I have a class foo , with a member bar of type std::shared_ptr<int> :

class foo
{
    std::shared_ptr<int> bar;
    /*other stuff here*/
};

In that class I want to assign a new int to bar . But I can't write bar = new int(); as the pointer does not have a public assignment operator.

How should I do this? I could std::move or std::swap but neither of those seem right.

Answer 1

bar = std::make_shared<int>(); is one way, especially if you like to retain the tractability of an assignment operator.

Answer 2

You could use reset for this:

bar.reset(new int());

This will delete the current contents (if any) and set the internal pointer to that returned by the new expression.