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	==Definition==		==Definition==
-	'''BYTE POINTER''' Alloc ( <'''INT''' size> )	+	'''VOID POINTER''' alloc ( <'''INT''' size> )
-	Allocates a block of memory of a certain size.	+	Allocates a [[memoryblock|block of memory]] of a certain size.
	== Parameters ==		== Parameters ==
	{|		{|
-	| '''INT''' size || - The size of the to be allocated memory.	+	| '''INT''' size || - The size of the to be allocated memory in [[byte]]s.
	|}		|}
	== Returns ==		== Returns ==
-	'''BYTE POINTER''' : Pointer to the first element of the allocated memory block.	+	'''VOID POINTER''' : Pointer to the first element of the allocated memory block.
-	== Throws ==	+	== Errors ==
	{|		{|
	| Insufficient memory || - There is insufficient memory available. This error doesn't occur often.		| Insufficient memory || - There is insufficient memory available. This error doesn't occur often.

---

Revision as of 00:37, 28 April 2007

Contents 1 Definition 2 Parameters 3 Returns 4 Errors 5 Example

Definition

VOID POINTER alloc ( <INT size> )

Allocates a block of memory of a certain size.

Parameters

INT size

- The size of the to be allocated memory in bytes.

Returns

VOID POINTER : Pointer to the first element of the allocated memory block.

Errors

Insufficient memory

- There is insufficient memory available. This error doesn't occur often.

Example

Program example;
Private
    byte pointer pbyte;
    word pointer pword;
    int  pointer pint;
    int elements = 10;
    int i;
Begin

    // Allocate memory
    pbyte = alloc(elements);
    pword = alloc(elements*sizeof(word));
    pint  = alloc(elements*sizeof(int));

    // Reset memory to 0's
    memset (pbyte,0,elements);
    memsetw(pword,0,elements); // same as  memset(pword,0,elements*sizeof(word));
                               // because value-parameter is 0.
    memset (pint ,0,elements*sizeof(int)); // There isn't a "memseti()", so we need to
                                           // set the individual bytes to 0. To change
                                           // ints to nonzero values, memset() can't be
                                           // used easily

    // Write numbers to bytes and ints
    for(i=0; i<elements; i++)
        pbyte[i]  = 133; // pbyte[i] is the same as *(pbyte+i)
        *(pint+i) = 4555; // pint[i] is the same as *(pint+i)
    end

	// Write numbers to words
	memsetw(pword,345,elements);

    // Show numbers
    for(i=0; i<elements; i++)
        say("byte["+i+"] = " + *(pbyte+i));
        say("word["+i+"] = " + pword[i]);
        say("int ["+i+"] = " + pint[i]);
    end

    Loop
        frame;
    End

End

Used in example: memset(), memsetw(), sizeof(), say(), pointer