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三元表达式的 Kotlin 实现，仅供娱乐
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| typealias 布尔类型 = Boolean | |
| fun main(vararg args: String) { | |
| val 返回值 = ("42" == "真理") 问号 "是的，我看过《银河系漫游指南》" 冒号 "瞎扯啥" | |
| println(返回值) // 瞎扯啥 | |
| } | |
| class 三块钱表达式<out 任意类型>(val 布尔值: 布尔类型, val 真值: 任意类型) | |
| infix fun <任意类型> 布尔类型.问号(真值: 任意类型) = 三块钱表达式(this, 真值) | |
| infix fun <任意类型> 三块钱表达式<任意类型>.冒号(假值: 任意类型) = if (布尔值) 真值 else 假值 |
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