[英]using smart pointers with “this”
I'm learning the use of boost smart pointers but I'm a bit confused about a few situations. 我正在学习使用boost智能指针,但我对一些情况有点困惑。 Let's say I'm implementing a state machine where each state is implemented by a single update method.
假设我正在实现一个状态机,其中每个状态都由一个更新方法实现。 Each state could return itself or create a new state object:
每个州都可以返回自己或创建一个新的状态对象:
struct state
{
virtual state* update() = 0; // The point: I want to return a smart pointer here
};
struct stateA : public state
{
virtual state* update() { return this; }
};
struct stateB : public state
{
virtual state* update() { if(some condition) return new stateA() else return this; }
}; };
The state machine loop would look like this: 状态机循环看起来像这样:
while(true)
current_state = current_state->update();
Could you translate this code to use boost smart pointers? 你能翻译这段代码来使用boost智能指针吗? I'm a bit confused when it comes to the "return this" part because I don't know what to do.
当谈到“返回这个”部分时,我有点困惑,因为我不知道该怎么做。 Basically I think it's useless to return something like "return boost::shared_ptr(this);"
基本上我觉得返回像“return boost :: shared_ptr(this);”这样的东西是没用的。 because it's not safe.
因为它不安全 What should I do?
我该怎么办?
您可能需要查看enable_shared_from_this
,它可以解决与您类似的问题。
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