19.0.0 released Nov 08, 2023
Purpose: Allocate memory.
new-mem [ define ] <memory> size <size> \
[ block-size <block size> ] \
[ init ]
new-mem allocates <memory> of <size> blocks, each block of <block size> bytes as specified in "block-size" clause, thus allocating <size>*<block size> bytes aligned suitably for any pointer type. By default, block size is 1, which means in that case <size> is the number of bytes. <memory> is allocated memory.
When "init" is used, the memory is zero-initialized. If you need the memory initialized, always use "init" as it is generally faster than creating memory and then initializing it (for instance with "memset()").
If "define" is used, variable <memory> is created if it does not exist. The pointer returned is always "void*" and can be used for any purpose; always cast it to your desired type.
If an existing pointer is used (i.e. without "define"), then such pointer can be of any type.
Allocate memory of 300 bytes, producing a "void *". Then the data is copied into it - note the casting to "char*";
new-mem define mystr size 300
strcpy ((char*)mystr, "Some string");
Initialize memory of 1000 bytes (filled with all zeroes):
new-mem define mymem size 1000 init
Allocate an array of 1000 integers:
new-mem mymem size 1000 block-size sizeof(int)
Allocate an array of 1000 integers initialized to 0 and then a single element of the array is assigned a value:
new-mem mymem size 1000 block-size sizeof(int) init
mymem = 23;
The memory can be created as "void *" and then assigned to any type:
new-mem define mymem size 1000 block-size sizeof(int) init
int *newmem = (int*)mymem;
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