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ssdfasd de4086dbfe docs: Fix core module documentation discrepancies

Fixed the following issues in XCEngine Core module documentation:
- Added 'using namespace XCEngine::Core;' to all code examples that use
  Core types (Event, FileWriter, etc.) without full namespace qualification
- Added missing '#include <XCEngine/Containers/String.h>' to FileWriter
  examples that use Containers::String
- Added '#include <string>' to Flush.md example using std::to_string

Affected files:
- core/core.md: Added using directive and Containers include
- event/*.md: Added using namespace to all 8 event doc files
- filewriter/*.md: Added using namespace and proper includes to all 6 files

2026-03-19 01:04:30 +08:00

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Event::Clear

void Clear();

清空所有订阅。

描述

移除所有已订阅的回调，清空事件。线程安全。

复杂度： O(n) 其中 n 为订阅数量

示例：

#include <XCEngine/Core/Event.h>

using namespace XCEngine::Core;

Event<int> event;

// 订阅多个回调
event.Subscribe([](int v) { });
event.Subscribe([](int v) { });
event.Subscribe([](int v) { });

// 清空所有订阅
event.Clear();

// 触发（无回调被执行）
event.Invoke(42);

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Event::Clear

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