49 lines
1.1 KiB
Markdown
49 lines
1.1 KiB
Markdown
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# Event::Subscribe
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```cpp
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uint64_t Subscribe(Callback callback);
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```
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订阅事件回调。
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**描述**
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将回调函数添加到事件订阅列表中，并返回一个唯一的订阅 ID。该 ID 可用于后续退订。线程安全，可在任意线程调用。
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**参数：**
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- `callback` - 要订阅的回调函数，类型为 `std::function<void(Args...)>`
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**返回：** `uint64_t` - 订阅 ID，用于退订
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**复杂度：** O(1) amortized
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**示例：**
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```cpp
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#include <XCEngine/Core/Event.h>
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// 定义事件
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Event<int, float> damageEvent;
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// 订阅多个回调
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uint64_t id1 = damageEvent.Subscribe([](int damage, float time) {
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printf("Damage taken: %d at time %f\n", damage, time);
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});
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uint64_t id2 = damageEvent.Subscribe([](int damage, float time) {
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// 记录伤害日志
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});
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// 使用 lambda 表达式
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auto callback = [](int damage, float time) {
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// 处理伤害
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};
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uint64_t id3 = damageEvent.Subscribe(callback);
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```
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## 相关文档
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- [Event 总览](event.md) - 返回类总览
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- [Unsubscribe](Unsubscribe.md) - 退订事件
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- [Invoke](Invoke.md) - 触发事件
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