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how to create a table/list of structs

NcfC

Hi,

I'm trying to create a struct variable,

defstruct( name field1 field2 ...)

struct_var = name

and then have a table/list where each element is a name struct. For example,

struct_var[1]->field1 = "1"

struct_var[1]->field2 = "11"

struct_var[2]->field1 = "2"

struct_var[2]->field2 = "22", and so on.

But it seems that I cannot create of table/list of name elements!

Could anyone help me?

Thanks in advance.

Best regards,

Parents
  • mbracht

    Not sure whether I really understand what you'r up to but...the defstruct statement only defines a template for a structure, to actually allocate memory for an instance of that template you need to call make_<structName>:

    defstruct(person name age)
    person1=(make_person)

    So the above defstruct statement "creates" the make_person() command. And again - the array that is created (name in your example) just serves as a template that is used during make_name().

  • NcfC
    in reply to mbracht

    hi, mbracht.

    thanks for the promptly reply.

    Sorry for the confusion.

    What I would like to to do is to create a table/list in which each element of the table/list is of the type name (a struct).

    Thanks again.

    Best regards,

  • mbracht
    in reply to NcfC

    (defstruct person first last age)
    tbl=(makeTable 'myTable)
    tbl[0] = (make_person ?first "Jim" ?last "Morrison" ?age 27)
    tbl[1] = (make_person ?first "Janis" ?last "Joplin" ?age 27)
    (println tbl[1]->first)    ;  <-- that should print 'Janis'

Reply
  • mbracht
    in reply to NcfC

    (defstruct person first last age)
    tbl=(makeTable 'myTable)
    tbl[0] = (make_person ?first "Jim" ?last "Morrison" ?age 27)
    tbl[1] = (make_person ?first "Janis" ?last "Joplin" ?age 27)
    (println tbl[1]->first)    ;  <-- that should print 'Janis'

Children
  • NcfC
    in reply to mbracht

    Hi, mbracht.

    using make_person worked very well, thanks. But why I cannot use tbl[0]->first = "Jim" instead? If I use

    tbl[0]->first = "Jim"

    tbl[0]->last = "Morrison"

    tbl[1]->first = "Janis"

    tbl[1]->last = "Joplin"

    I get,

    ocean> tbl[1]->first
    "Janis"
    ocean> tbl[0]->first
    "Janis"

    Best regards,

  • mbracht
    in reply to NcfC

    Like I said you need to allocate the memory for a structure which only make_<structName> does.
    What happens in the tbl[0]->first statement is that
    1) tbl[0] is evaluated
    2) the arrow operation ->first is applied to whatever tbl[0] evaluates to.
    Now unless you do tbl[0]=make_person(..). tbl[0] will return the unbound symbol. So you apply the arrow operation to unbound which is syntactically correct but not what you want. What you really want is to apply ->first to a structure of type person so make sure tbl[0] is a structure of type person.

  • NcfC
    in reply to mbracht

    Oh, OK. It makes sense!

    thanks very much.

    best regards

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