本内容遵循CC 4.0 BY-SA版权协议 栈和队列自己不存数据，只规定数据从哪一端进出。priority_queue 更极端：它连进出顺序都不规定，只规定谁先出去。 为什么需要适配器 用 C 写一个栈，先得决定底层是数组还是链表，再手写 push、pop、top。换一种元素类型，整套重写。

错误用法在编译期就被拦住了，这比任何注释和文档都可靠。 理解这层身份很重要。 你会明白为什么换个底层容器，业务代码一行都不用改；也会明白为什么以后看到 priority_queue 时，第一反应应该是“这也是个容器适配器”。

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