[Issue 6153] Inserting to An Array!T inside an Array!(Array!T) causes a segfault.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6153


SomeDude <lovelydear at mailmetrash.com> changed:

           What    |Removed                     |Added
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                 CC|                            |lovelydear at mailmetrash.com


--- Comment #1 from SomeDude <lovelydear at mailmetrash.com> 2012-04-24 07:56:49 PDT ---
The following works correctly:

import std.stdio;
import std.container;

int main() {
    alias Array!int Arr1D;
    alias Array!Arr1D Arr2D;

    auto arr1D = Arr1D();
    auto arr2D = Arr2D();

    writefln("arr1D %s of size = %d", arr1D, arr1D.length());
    arr1D.insert(1); 
    arr1D.insert(2);
    writefln("arr1D %s of size = %d", arr1D[0], arr1D.length());

    arr2D.insert(arr1D);
    writefln("arr2D %s of size = %d", arr2D, arr2D.length());
    writeln(arr2D[0][0], arr2D[0][1]);
    return 0;
}

It produces the output:
PS E:\DigitalMars\dmd2\samples> rdmd a.d
arr1D
Array!(int)(RefCounted!(Payload,cast(RefCountedAutoInitialize)0)(_RefCounted(null)))
of size = 0
arr1D 1 of size = 2
arr2D
Array!(Array!(int))(RefCounted!(Payload,cast(RefCountedAutoInitialize)0)(_RefCounted(A623F0)))
of size = 1
12
PS E:\DigitalMars\dmd2\samples>


However inserting ints in arr1D *after* having inserted it in arr2D produces
access violations:

import std.stdio;
import std.container;

int main() {
    alias Array!int Arr1D;
    alias Array!Arr1D Arr2D;

    auto arr1D = Arr1D();
    auto arr2D = Arr2D();
    arr2D.insert(arr1D);
    writefln("arr2D %s of size %d", arr2D[0], arr2D.length());

    arr2D[0].insert(1);
    arr2D[0].insert(2);
    writefln("array size after insert: %d", arr2D[0].length());
    //writeln(arr2D[0][0], arr2D[0][1]);
    return 0;
}

produces:
PS E:\DigitalMars\dmd2\samples> rdmd bug.d
arr2D
Array!(int)(RefCounted!(Payload,cast(RefCountedAutoInitialize)0)(_RefCounted(null)))
of size 1
array size after insert: 0
PS E:\DigitalMars\dmd2\samples>

It seems that the reason is, as long as arr1D has no elements inserted via
insert, it's not allocated and arr2D[0] is null.

See also issue 7901.

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