Geo7 Posts - Answer Overflow

Geo7

•Created by Geo7 on 10/30/2023 in #questions

How to Implement Recursive data type

I want to Implement abstract syntax tree in mojo, so far no luck, Something simple as this in C : https://github.com/orangeduck/mpc/blob/master/mpc.h#L291

struct ast {
  char *tag;
  char *contents;
  int children_num;
  struct ast** children;
}

struct ast {
  char *tag;
  char *contents;
  int children_num;
  struct ast** children;
}

6 replies

MModular

•Created by Geo7 on 10/18/2023 in #questions

How to store Struct(or string) into DynamicVector

I want to store struct into DynamicVector at first I tried

from utils.vector import DynamicVector


struct Person:
    var first: String
    var last: String
    var id: Int

    fn __init__(inout self, n: String, l: String, id: Int):
        self.first = n
        self.last = l
        self.id = id


fn main() raises:
    var x = DynamicVector[Person]()
    let me = Person("A", "B", 1)
    x.push_back(me)

from utils.vector import DynamicVector


struct Person:
    var first: String
    var last: String
    var id: Int

    fn __init__(inout self, n: String, l: String, id: Int):
        self.first = n
        self.last = l
        self.id = id


fn main() raises:
    var x = DynamicVector[Person]()
    let me = Person("A", "B", 1)
    x.push_back(me)

then I tried to change String Pointer[UInt8] now I do not know how to load string into Pointer[UInt8]

from utils.vector import DynamicVector

alias PointerString = Pointer[UInt8]
alias PointerStrings = Pointer[PointerString]
alias BufferPtrType = DTypePointer[DType.uint8]


@value
@register_passable("trivial")
struct Person:
    var id: Int
    var first: PointerString
    var last: PointerString

    fn __init__(inout self, id: Int, f: PointerString, l: PointerString) -> Self:
        self.id = id
        self.first = f
        self.last = l
        return self


fn main() raises:
    var x = DynamicVector[Person]()
    let first = PointerString.alloc(100)
    first.store(0, 12)
    let last = PointerString.alloc(100)
    last.store(0, 17)
    let id = 1
    let me = Person(id, first, last)
    x.push_back(me)

from utils.vector import DynamicVector

alias PointerString = Pointer[UInt8]
alias PointerStrings = Pointer[PointerString]
alias BufferPtrType = DTypePointer[DType.uint8]


@value
@register_passable("trivial")
struct Person:
    var id: Int
    var first: PointerString
    var last: PointerString

    fn __init__(inout self, id: Int, f: PointerString, l: PointerString) -> Self:
        self.id = id
        self.first = f
        self.last = l
        return self


fn main() raises:
    var x = DynamicVector[Person]()
    let first = PointerString.alloc(100)
    first.store(0, 12)
    let last = PointerString.alloc(100)
    last.store(0, 17)
    let id = 1
    let me = Person(id, first, last)
    x.push_back(me)

7 replies

Gaming

Programming