Hi Nim-mancers : )
* Is the code below with Unchecked array valid?
* What will happen if my object has variables for managed stuff? Do I need to
dispose/reset my object before freeing mem?
type
Player = object
hp: int
attack: int
var
players = cast[ptr UncheckedArray[Player]](alloc(Player.sizeof*2))
players[1].hp = 30
# resize array
players = cast[ptr UncheckedArray[Player]](realloc(players, Player.sizeof *
4))
players[3].hp = 20
var pp = addr players[1]
echo pp[]
echo players[1]
echo players[3]
# just for fun
swap(players[1], players[3])
echo "-------------------"
# now its player 3
echo pp[]
echo players[1]
echo players[3]
# free, set pointer to nil
players = cast[ptr UncheckedArray[Player]](realloc(players, 0))
echo repr(players)
# bad, dangling pointer
echo pp[]
Run
As a game developer I prefer to allocate memory for stuff I need and instead of
creating/destroying objects just reuse allocated.
I'll try to explain what I want to achieve :
[ 1 2 4 5 | 3 ] real size: 5 elements, actual size: 4 elements
if I "add" new element here then instead of creating new one I take element
3 (unused) instead.
Only if my actual size equals to the real size I will resize the cap of a
container
Run
I guess in some ways it's similar to Nim sequences but they don't work for this
scenario and arrays are strictly sized in Nim as far I understood.
( In C# I actually use arrays instead of lists but I have the ability to resize
em by creating a new array of a new size and copying stuff from the previous
one, but I realize that C# arrays are different from those in Nim )
Thanks!
