19 lines
454 B
Markdown
19 lines
454 B
Markdown
+++
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title = 2024-05-19
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author = ["SouthFox"]
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date = 2024-05-19T23:43:00+08:00
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lastmod = 2024-05-19T23:59:42+08:00
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tags = ["publish"]
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draft = false
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+++
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## Scheme 数据类型 {#scheme-数据类型}
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在 [Scheme]({{< relref "../main/20240519235937-scheme.md" >}}) 里定义一个数据类型,声明它的构造函数……参数,以及判断方法,还有 set 方法
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```scheme
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(define-record-type <vec2>
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(make-vec2 bv)
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vec2?
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(bv vec2-bv))
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```
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