Re: Returning dynamic array from the function

[sclytrack]

On Wednesday, 17 October 2012 at 19:22:05 UTC, Simen Kjaeraas 
wrote:
On 2012-10-17, 21:17, m0rph wrote:

I tryed to learn how arrays works and found another strange 
thing:

import std.stdio;

int[] create()
{
        int[5] a1 = [ 10, 20, 30, 40, 50 ];
        int[] b1 = a1;
        writeln("b1: ", b1);
        return b1;
}

void main()
{
        int[] a2 = create();
        writeln("a2: ", a2);
}

Result of execution:
b1: [10, 20, 30, 40, 50]
a2: [-142625792, 32767, 4358059, 0, 5]

Please explain what's wrong with this code? Why variable a2 
contains crap? Is this another dmd/druntime bug or I missed 
something?

b1 points to the exact same data as does a1. This data is stack-
allocated, and thus a2 points to an overwritten stack frame.


It doesn't give an error when marking the function with safe.

@safe
int[] create()
{
}