在不改变对象结构的前提下，为对象添加新的操作。
How to install visitor-pattern?
microwind/ai-skills/visitor-pattern
$npx -y skills add microwind/ai-skills --skill visitor-patternInstalls into the current project.
›Prefer a prompt? Paste this to your agent
Run `npx skills use "https://github.com/microwind/ai-skills" --skill "microwind/ai-skills/visitor-pattern"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/microwind/ai-skills" that are relevant to the current task. Run `npx skills add "https://github.com/microwind/ai-skills"` and select the relevant skills, then follow their instructions.
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