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MysticVegeta

Mon Nov 07, 2005 7:54 pm


"free" function for simple array.

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i am aware of the "free" function used to "free"/"empty" a flexible array, i was wondering if we could do the same with regular array.


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beard0

Mon Nov 07, 2005 9:56 pm


Re: "free" function for simple array.

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i am aware of the "free" function used to "free"/"empty" a flexible array, i was wondering if we could do the same with regular array.

Why not just try, and see if it works?


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MysticVegeta

Mon Nov 07, 2005 11:29 pm



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I did:
 Array grid is not flexible and hence cannot be 'free'ed


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beard0

Tue Nov 08, 2005 12:36 am



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Then why did you ask?

I could understand "Why can't..."
In which case the answer would be because free varName is a shorthand for new varName, 0
which only works with flexible arrays, as they are the only ones whose size is flexible.


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do_pete

Tue Nov 08, 2005 1:49 pm



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If you want to make all the things in a variable equal 0 you can use xomething like this:
var variableName : array 1 .. 5, 1 .. 5 of int

for x : 1 .. 5
    for y : 1 .. 5
        variableName (x, y) := 0
    end for
end for



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MysticVegeta

Tue Nov 08, 2005 2:03 pm



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No, I want them equal to nothing, nothing so that grid(x, y) returns an error of "No value for variable". Just like we can do in flexible arrays. I thought it could be done, guess i was wrong.


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do_pete

Tue Nov 08, 2005 2:49 pm



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when you declare you array then there will be no value for variable


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Tony

Tue Nov 08, 2005 3:06 pm



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turing doesn't appear to allow you to drop a non-dynamically allocated variable.

The best way would be to include the array in a type, and use a pointer to that type. You could free a pointer afterwards.

Or if you're feeling adventurous, try the following out


var arr : array 1 .. 2 of int := init (1, 2)
var test : array 1 .. 2 of int
var buffer : array 1 .. (256 div 4) of int %reserve memory for our tricks
put "array : ", arr (1), " ", arr (2)
var address : addressint := addr (arr)
put "located at: ", address
test (1) := int@(address)
test (2) := int@(address + sizeof (int))
put "test array: ", test (1), " ", test (2)
string@(address) := "Tony was here"
put "the original array has became: ", arr (1), " ", arr (2)
put "a copy has remain in test: ", test (1), " ", test (2), " located at: ", addr (test)
put "since the difference between arr and test is: ", addr (test) - addr (arr)
put "which is less than size of the string put in place: ", sizeof (string)
put "this explains why test array was overwriten as well"



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beard0

Tue Nov 08, 2005 4:10 pm



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Or if you're feeling adventurous, try the following out

Fun, I hadn't really had the chance to try this out before.  I'll have to play with this.


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MysticVegeta

Tue Nov 08, 2005 7:13 pm



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when you declare you array then there will be no value for variable

I meant after changing its value.