M
Modular•3y ago
ct

newbie needs help with error messages

the code: 
@register_passable("trivial")
struct Item:
    var name: StringLiteral
    var qty: Int

    fn __init__(inout self) -> Self:
        self.name = "Unnamed"
        self.qty = 0


fn main():
    var item = Item()
@register_passable("trivial")
struct Item:
    var name: StringLiteral
    var qty: Int

    fn __init__(inout self) -> Self:
        self.name = "Unnamed"
        self.qty = 0


fn main():
    var item = Item()
gives error 
invalid call to '__init__': callee expects 1 argument, but 0 were specified
invalid call to '__init__': callee expects 1 argument, but 0 were specified
what should I do?
16 Replies
Fester
Fester•3y ago
New here, but I don't get that error when running it.
ct
ctOP•3y ago
this is what I get 
@register_passable("trivial")
struct Item:
    var name: StringLiteral
    var qty: Int

    fn __init__(inout self) -> Self:
        self.name = "Unnamed"
        self.qty = 0


fn main():
    var item: Item = Item()
    var ls = DynamicVector[Item]()
    ls.push_back(item)
    print(ls[0].name)
c@c:~/w/mojo-playground$ mojo hello.mojo 
hello.mojo:15:26: error: invalid call to '__init__': callee expects 1 argument, but 0 were specified
    var item: Item = Item()
                     ~~~~^~
hello.mojo:9:5: note: function declared here
    fn __init__(inout self) -> Self:
    ^
mojo: error: failed to parse the provided Mojo
@register_passable("trivial")
struct Item:
    var name: StringLiteral
    var qty: Int

    fn __init__(inout self) -> Self:
        self.name = "Unnamed"
        self.qty = 0


fn main():
    var item: Item = Item()
    var ls = DynamicVector[Item]()
    ls.push_back(item)
    print(ls[0].name)
c@c:~/w/mojo-playground$ mojo hello.mojo 
hello.mojo:15:26: error: invalid call to '__init__': callee expects 1 argument, but 0 were specified
    var item: Item = Item()
                     ~~~~^~
hello.mojo:9:5: note: function declared here
    fn __init__(inout self) -> Self:
    ^
mojo: error: failed to parse the provided Mojo
Fester
Fester•3y ago
No description
Fester
Fester•3y ago
Weird
ct
ctOP•3y ago
mojo --version mojo 0.2.1 (64d14e85)
Fester
Fester•3y ago
I did in fact not have 0.2.1 installed Sorry
ct
ctOP•3y ago
do you have a newer version?
Fester
Fester•3y ago
Older Just ran the install function again
ct
ctOP•3y ago
does it download the 350MB or so or is it smart about it?
Fester
Fester•3y ago
Heh, I dunno how much it downloaded
ct
ctOP•3y ago
This is what I got now:
@register_passable("trivial")
struct Item:
    var name: StringLiteral
    var qty: Int

    fn __init__(inout self) -> Self:
        return Self {name: "Unnamed", qty: 0}


fn main():
    var item = Item()
    var ls = DynamicVector[Item]()
    ls.push_back(item)
    print(ls[0].name)
    print(ls[0].qty)
@register_passable("trivial")
struct Item:
    var name: StringLiteral
    var qty: Int

    fn __init__(inout self) -> Self:
        return Self {name: "Unnamed", qty: 0}


fn main():
    var item = Item()
    var ls = DynamicVector[Item]()
    ls.push_back(item)
    print(ls[0].name)
    print(ls[0].qty)
error: 
error: invalid call to '__init__': callee expects 1 argument, but 0 were specified
    var item = Item()
error: invalid call to '__init__': callee expects 1 argument, but 0 were specified
    var item = Item()
Fester
Fester•3y ago
Just FYI, when I get rid of the parens for var item = Item() it complains about something else error: return expected at end of function with results Which I assume is what you're after?
ModularBot
ModularBot•3y ago
Congrats @superfes, you just advanced to level 1!
ct
ctOP•3y ago
I think the parens are necessary and should call the __init__ with "self" being provided
ModularBot
ModularBot•3y ago
Congrats @ct, you just advanced to level 2!
ct
ctOP•3y ago

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