Re: Can't understand if deallocation happens?

[Mike Parker via Digitalmars-d-learn]

On Sunday, 22 January 2017 at 15:59:47 UTC, Suliman wrote:
On Sunday, 22 January 2017 at 15:51:01 UTC, Suliman wrote:
        string str = "abc";
        writeln(str.ptr);
        str = "def";
        writeln("last data: ", *(str.ptr));
        writeln("old data: ", *(str.ptr-1)); // print nothing
        writeln("old data: ", *(str.ptr-2)); // print c
It's look like that there is some gap between data, because 
`d` minus 1 should be `c`, but `c` I am getting only if I am 
doing `-2`. Why?

writeln("old data: ", cast(int)*(str.ptr-1));

#old data: 0

String is gaping by zero?? I thought they are continuously like

abcdef
---↑

Where `↑` is equal to `ptr`.

You have *two* distinct strings here. Why do you expect them to 
be sequential in memory? If you want them to be treated as one 
string, concatenate them.

auto s1 = "abc";
auto s2 = "def";
auto s3 = s1 ~ s2;