Passing dynamic arrays

[Ali Çehreli]

Steven Schveighoffer wrote:
 > On Mon, 08 Nov 2010 13:35:38 -0500, Daniel Gibson
 >> If you pass a dynamic array to a function and chance it's size within
 >> the function, you have undefined behaviour - you never know if it will
 >> affect the original array (from the calling function) or not.
 >
 > Not exactly.  If you happen to change its size *and* change the original
 > data afterwards, then it's somewhat undefined

Let's also note that appending to the array qualifies as "change its 
size *and* change the original data afterwards." We cannot be sure 
whether appending affects the passed-in array.

 > (I'd call it confusing,
 > since the behavior is perfectly defined, just hard to describe).

I like the term "discretionary sharing semantics" where any slice can 
leave the sharing contract at their discretion regardless of whether 
they modified the shared elements so far.

Ali