希望在语法层面支持引用和函数指针的类型用来支持C代码的生成

[mishihuyong]

Feature Request

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Teachability, Documentation, Adoption, Migration Strategy:

[mishihuyong]

我们的项目需要用KCL来定义元模型，用来生成c语言代码。但是有如下两个问题
1）c语言有结构体指针。如果KCL不支持指针类型或者引用类型，这会导致大量的深拷贝。将所有结构体的引用都进行拷贝，影响效率

  type Ref[T]=&T
 Schema Person {
    name : str
    friends : [Ref[Person]]  # 引用列表  如果不支持引用，像c语言这种生成，就会导致大量的拷贝，浪费
}

2）c语言有函数指针类型，KCL不支持这种表达. 如果元模型结构体有指针类型，KCL无法支持

#函数指针模型
Type callback=(T1, T2, ...) ->R

# 真实的函数类型
type AddFunc =(a:int, b:int) ->int

#函数
func add(a:int, b:int) ->int:
   return a+b

希望能在KCL语法层面支持这两种类型

[Peefy]

https://github.com/kcl-lang/kcl-go/blob/main/pkg/tools/gen/gengo.go#L26 We use KCL to generate Go's pointer types by default, but it also supports non-pointer types. Is this helpful to you? Alternatively, we could use decorators to support extending this metatype.

schema InfoExample:
    @info(use_pointer=True)
    profile: Profile

schema Profile:
    name: str
    age: int