Re: About ref used for performance reasons with struct

[Era Scarecrow]

On Monday, 11 February 2013 at 21:45:11 UTC, Nick Sabalausky 
wrote:
On Mon, 11 Feb 2013 07:52:28 +0100 "deadalnix" 
<deadal...@gmail.com> wrote:

I'm thinking about it for a while now and I'm now convinced 
that we should allow the compiler to do that job for us. Let 
me explain.


To be honest, up until recently, I mistakenly thought the 
compiler DID do this. (Yea, my mistake.)

Is it possible I had confused structs with static arrays? Do 
static arrays do that?

 I'm pretty sure static/fixed arrays are more like structs, and 
thereby whole copies are made rather than sending a slice. Let's 
find out.

  void main() {
    char[4] test = "test";
    writeln(&test, "- main");
    fun(test);
    if (test == "test")
      writeln("is passed by value/copy");
    else {
      assert(test == "best", "Something's wrong...");
      writeln("is passed by slice/ref");
    }
  }

  void fun(char[4] test){
    assert(test == "test");
    writeln(&test, "- fun");
    test[0] = 'b';
    assert(test == "best");
  }

Output:

18FDD0- main
18FDAC- fun
is passed by value/copy