c++ - 从抽象类创建链

Question

我有一个任务，所以我并不是真的在找人来解决它，只是想了解实际要求的内容，因为我觉得它措辞不佳。

1. Please implement the function described in the comment of this incomplete code snippet



// AudioEffect is the base class for effects that can process
// audio and have a subsequent effect (next).
struct AudioEffect {
virtual ~AudioEffect() = default;
virtual void process(float* buf, size_t num) = 0;
std::shared_ptr<AudioEffect> next;
};
// Implement a function that checks if there is a feedback loop
// in the effects chain.
... detect_feedback(...)
{
}

Answer 1

我能看到的唯一循环是在指针链中。

所以你必须跟随 next 指针，确保你永远不会遇到相同的效果两次。