OCaml 前向声明
有没有办法在 OCaml 中进行 C 风格的前向声明？
我的问题是我有两个相互引用的变体：
type path_formula =
[ `Next of state_formula
| `Until of (state_formula * state_formula)
| `UntilB of (state_formula * int * state_formula)
]
type state_formula =
[ `True | `False
| `Not of state_formula
| `And of (state_formula * state_formula)
| `Or of (state_formula * state_formula)
| `Imply of (state_formula * state_formula)
| `Label of string
| `Prob` of (boundf * path_formula)
| `Expc` of (boundi * formula)
]
所以两种类型都必须知道另一种类型。我在 Google 上搜索了它，但不幸的是 OCaml 并不是一种广泛使用的编程语言。
Is there a way to do a C-style forward declaration in OCaml?
My problem is that I have two variants which mutually refer to each other:
type path_formula =
[ `Next of state_formula
| `Until of (state_formula * state_formula)
| `UntilB of (state_formula * int * state_formula)
]
type state_formula =
[ `True | `False
| `Not of state_formula
| `And of (state_formula * state_formula)
| `Or of (state_formula * state_formula)
| `Imply of (state_formula * state_formula)
| `Label of string
| `Prob` of (boundf * path_formula)
| `Expc` of (boundi * formula)
]
So both type must know the other one.. I searched for it on Google but unfortunately OCaml is not a so wide-use programming language..
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用于
具有递归类型。
Use
to have recursive types.