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不对,它们的类型可以都是 BinTree
然后运行时都可以 Visitor 动态剥开 Term / Leaf sum-type 分支
然后运行时都可以 Visitor 动态剥开 Term / Leaf sum-type 分支
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他说的是类型检查,当然 C++ compile time 有 constexpr 能做得也不少
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