Created
November 23, 2016 10:36
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common lisp 的宏 INCF, DECF
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| 语法 | |
| incf place [delta-form] => new-value | |
| decf place [delta-form] => new-value | |
| 参数和值 | |
| place --- 可以简单的认为是一个对象 | |
| delta-form --- 一个 delta 的 form | |
| delta --- 一个数字 | |
| new-value --- 新的值 | |
| 描述 | |
| incf 增加 place 的值 | |
| decf 减少 place 的值 | |
| 代码 | |
| * (setq n 0) | |
| 0 | |
| * (incf n) | |
| 1 | |
| * (incf n 2.5) | |
| 3.5 | |
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