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A freed access type variable is supposed to be set to NULL; why does it keep the same address?


A freed access type variable is supposed to be set to NULL; why does it keep the same address?

By : Aditi Khullar
Date : November 21 2020, 01:01 AM
it fixes the issue var is an access variable that points to (or accesses) an integer. The access variable var typically lives on the stack. It typically uses 4 or 8 bytes of memory. When hello is called, the program allocates an integer on the "heap", and sets var to point to the integer. Therefore, var will contain the address of the new integer (the Ada language doesn't require that it actually contains the address, but in most implementations it will). After you free it, var will contain null.
However, var'address doesn't give you the address of the integer, or the contents of the 4 or 8 byte pointer. var'address is the address of the pointer itself--that is, the address of the 4 or 8 bytes it uses on the stack.
code :


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Why value of local variable(its address is stored in global variable) is freed when function has completed its execution

Why value of local variable(its address is stored in global variable) is freed when function has completed its execution


By : santosh
Date : March 29 2020, 07:55 AM
This might help you Freeing doesn't mean that the system will modify the value stored there (which would involve unnecessary overhead). It just means that this memory space is made available for future storage.
you have tried to assign the Null value to a variable that is not of data type variant - access

you have tried to assign the Null value to a variable that is not of data type variant - access


By : Darian
Date : March 29 2020, 07:55 AM
it should still fix some issue From what I can see, the only control on your main form is a list object which is being used to select the person that is to be shown on the subform.
I think this design is causing you difficulties.
In golang why an interface variable can get address of a struct variable but cannot from a basic type variable?

In golang why an interface variable can get address of a struct variable but cannot from a basic type variable?


By : Oni Oluwatoyin Tee-w
Date : March 29 2020, 07:55 AM
wish of those help It's explained in the specification:
code :
b := MyintB(2)
a = &b
Is the address of local variable freed?

Is the address of local variable freed?


By : Rohit K
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You SHOULD NOT return a pointer to a variable that's function local. That's UNDEFINED BEHAVIOUR. DO NOT DO IT. EVER!!
The reason is that your local variable, i in this case, is destroyed when your function exits, so you pointer after your function exit will point to memory that contains at most junk.
Can GDB help to find out when a memory address is freed?

Can GDB help to find out when a memory address is freed?


By : PJ Heta
Date : March 29 2020, 07:55 AM
this will help Can GDB track when a memory address is freed? Putting a watch on the address doesn't help, since it does not break when memory at address is freed, but only when it is touched. ,
Can GDB track when a memory address is freed?
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