using varibales in other variable names?

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Gibbon28

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Posted: 30th Oct 2012 11:53

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Hi, i dont suppose there is but usin tier 1 is there any way of using variables withing variable names?

like PHP:

var1 = "foo"
${var1} = hello.

result : foo = hello.

Thanks
Andy

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Hodgey

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Posted: 30th Oct 2012 12:05

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Nope, you can't do that in Tier 1 or Tier 2.

Jim can you do it in Tier 3?

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Gibbon28

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Posted: 30th Oct 2012 12:06

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Hmm Tier one would be amazing if it had the ability to create classes, or user functions within types.

Andy

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Hodgey

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Posted: 30th Oct 2012 12:15

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Quote: "Hmm Tier one would be amazing if it had the ability to create classes, or user functions within types."

I agree the Tier 1 language could use some more features, referencing is something I'd really like to see. It's the main reason I mostly use Tier 2 now. Tier 1 is great for fast prototyping though.

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JimHawkins

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Posted: 30th Oct 2012 13:27

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Pascal is strongly typed, so this kind of fast-and-loose assignment is not regarded as good practice. But you can assign any simple (ie non-structured type) to a Variant:

+ Code Snippet

Type  
  TMyEnum = (One,Two,Three);  
 
Var  
  V : Variant;  
  I : Integer;  
  B : Byte;  
  W : Word;  
  Q : Int64;  
  E : Extended;  
  D : Double;  
  En : TMyEnum;  
  AS : AnsiString;  
  WS : WideString;  
 
begin  
  V:=I;  
  V:=B;  
  V:=W;  
  V:=Q;  
  V:=E;  
  V:=En;  
  V:=D:  
  V:=AS;  
  V:=WS;  
end;

They can be useful for COM objects and Interfaces. I've only used them when programming compilers, where they are handy for containing the next token.

Personally I wouldn't recommend using them under ordinary circumstances, because they cannot be optimised, since the compiler doesn't know the type of the assignment to a variant until run time. This means they will be substantially slower than typed variables.

As far as extending Tier 1 with OOP stuff etc goes, this has been argued to death in the forum. Maybe I should make a few videos to show that Pascal is just as easy to use as Basic, and all these goodies come with it. There's no real need to keep re-inventing the wheel.

-- Jim DO IT FASTER, EASIER AND BETTER WITH AppGameKit FOR PASCAL

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Gibbon28

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Posted: 30th Oct 2012 15:09

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HI JimHawkins, i actuall know pascal quite well, as a full time programmer i use delphi and lazarus for linux.

The problem i have is keeping with updates. Ive used other engines that focus on one language but is compatiable for all these but then over time they get "left" behind in regards to updates.

So i dont want that to happen here.

IS there any docs or tuts on getting a pascal written AppGameKit app to IOS devices?

Thanks
Andy

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JimHawkins

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Posted: 30th Oct 2012 17:31

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Have a look at:

http://www.bilsen.com/agkpas/index.shtml

All the source is there, so future-proof.

Current version is 1076. When the newest version is stable Erik will update the Pascal.

-- Jim DO IT FASTER, EASIER AND BETTER WITH AppGameKit FOR PASCAL

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kamac

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Posted: 30th Oct 2012 18:02

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Quote: "Nope, you can't do that in Tier 1 or Tier 2. "

Phew... There's almost nothing that cannot be done within C++... Have a look at boost libraries, that's some firepower.

I am not sure if I understand OP's question. Did you mean something like interfaces ( as in AS3 )?

Or something like,

+ Code Snippet

mytype var1 = "mehehehe";
mysecond_type var2 = 356;
var1 += var2;

If not, please explain. Unless you don't want to know how to do that with C++.

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Gibbon28

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Posted: 30th Oct 2012 18:13 Edited at: 30th Oct 2012 18:14

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Ill give an example of why i need this.

If i want create my own type:

+ Code Snippet

type myType
name
age
endtype

i want to then have a function that can dynamically create types:

+ Code Snippet

function createType()
id = random(1000)
id as myType //<---- This wont work

//DO OTHER FUNCTION STUFF
endfunction id

i could then do

+ Code Snippet

testType1 = createType()

Thanks
Andy

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kamac

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Posted: 30th Oct 2012 18:40 Edited at: 30th Oct 2012 18:49

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Well, in C++ you could do that;

+ Code Snippet

class myType
{
public:
    int age;
    char* name;
    myType() { };
    myType& operator=(const char* some_name) {
        this->name = some_name;
        return *this;
    }
    myType& operator=(const int some_int) {
        this->age = some_int;
        return *this;
    }
};

int main(int argc, char* argv[])
{
    myType id = createType();
    return 0;
}

myType createType()
{
    srand(time(0));
    myType id = rand()%1001;
    return id;
}

And that should work (written from head, so not so sure)

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kamac

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Posted: 30th Oct 2012 18:49 Edited at: 30th Oct 2012 18:54

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Ew. Wait. This works,

+ Code Snippet

type myType
    age as integer
    name as string
endtype

do
    testType as myType
    testType = createType()
    print(testType.age)
    sync()
loop

function createType()
    testType as myType
    testType.age = random(1000)
endfunction testType

Is that what you've wanted?
Or you've wanted to make operator = overloaded, just as in C++?
So that you could, testType as myType = 266. In that case it's impossible within AGK.

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Gibbon28

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Posted: 30th Oct 2012 21:25 Edited at: 30th Oct 2012 21:29

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I dont think the above is what i want.

Basically i want to be able to declare types dynamically.

This cannot be done, not even with an array.

If you make a type, the only way to then declare them is giving them variable name directly, not from a loop, or from dynamic variable names. for instance this would be what i want.

+ Code Snippet

type myType
    age as integer
    name as string
endtype

dim test[10]

for I=1 TO 10
    test[I] as myType
next I

Andy

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kamac

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Posted: 30th Oct 2012 21:29

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Well this sample:

+ Code Snippet

type myType
    age as integer
    name as string
endtype

for I=1 TO 10
    test+I = foo as myType
next I

Is kinda breaking whole programming logics.
To be accurate, this line:

+ Code Snippet

test+I = foo as myType

you can't have test+I. That's just impossible in very most of languages.

You would have an array instead.

But nope, it's not possible within AppGameKit then.

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Gibbon28

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Posted: 30th Oct 2012 21:30

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Sorry i edited to:

test[I] as myType

but still, it doesnt work.

Andy

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kamac

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Posted: 30th Oct 2012 21:56 Edited at: 30th Oct 2012 22:12

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I know that what you want is possible within AS3 for sure. Should be possible ( and is ) within C++. I am speaking of having an array / vector of different classes.

The best you can have in AppGameKit is:

+ Code Snippet

type myType
    age as integer
    name as string
endtype

dim test[10] as myType

for I=1 TO 10
    test[I].age = I
    test[I].name = "undefined"
next I

So, an array has to be defined type.

In AS3 you can have something like this:

+ Code Snippet

var myArray:Array = new Array();
myArray.push(new myFirstType());
myArray.push(new mySecondType());
myArray.push(new myThirdType());
myArray[0].name = "abc";
myArray[1].print("bleh");
myArray[2].something();

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Hodgey

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Posted: 30th Oct 2012 22:25

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Quote: "Phew... There's almost nothing that cannot be done within C++... "

What I originally though he was trying to do was create a new variable with the variable name equal to the string of another variable. I know next to nothing about php but I just remembered that web based languages often refer to variables using quotation marks.

So I thought he was trying to do this:
String a = "ten"
magic(a)
// new variable suddenly made called ten
ten = 0

Quote: "Basically i want to be able to declare types dynamically."

This can't be done in Tier 1, but can be done in C++. You could use templates to dynamically assign types to things.

E.g

+ Code Snippet

    // dynamically create a new node of the desired type
    Node<float> *c = new Node<float>;
    Node<char> *h = new Node<char>;
    
    c->setValue(2.5f);
    h->setValue(65);
    
    cout << c->getValue() << endl;
    cout << h->getValue() << endl;
    
    delete c;
    delete h;

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JimHawkins

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Posted: 31st Oct 2012 01:19 Edited at: 31st Oct 2012 01:21

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Andy - I'm still not at all clear why you want to go down this route. It sure as hell isn't going to happen in Tier 1 Basic. You could probably do this quite easily using Lua, but Tier 1 doesn't have a Lua interface, so you would have to use C++ or Pascal.

So - is the need:

a) make Tier 1 do something it doesn't do
b) have some dynamic event most of us don't grasp

If you're an experienced Delphi programmer you will only suffer endless grief expecting T1 to give you what you're used to, whereas you could be up and running in seconds using the familiar language and IDE of Delphi (almost any version) and Lazarus/Free Pascal.

I notice that you have only just joined the forum. Have you purchased AppGameKit? If so, AppGameKit for Pascal is there waiting for you!

-- Jim DO IT FASTER, EASIER AND BETTER WITH AppGameKit FOR PASCAL

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