参观者模式#
Visitor Pattern
代码示例#
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```c
```
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```c++
```
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```c#
```
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```go
```
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```java
```
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```javascript
```
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```kotlin
```
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```php
```
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```python
```
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```python
```
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```ruby
```
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```rust
```
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```scala
```
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```swift
```
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```typescript
```
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