Created
December 13, 2016 07:45
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common lisp 的特殊操作符 THE
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| 语法 | |
| the value-type form => result* | |
| 参数和值 | |
| value-type --- 一个类型标识符 | |
| form --- 一个 form | |
| results --- 对 form 求值产生的 结果, 这些结果符合 value-type | |
| 代码 | |
| * (the fixnum (+ 5 7)) | |
| 12 | |
| * (the symbol (+ 5 7)) | |
| debugger invoked on a SIMPLE-TYPE-ERROR: | |
| Value of (+ 5 7) in(THE SYMBOL (+ 5 7)) is 12, not a SYMBOL. |
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