Hello, this is a Japanese programmer, katahiromz.

If TYPE1 was compatible to TYPE2, I think TYPE1* should be compatible to TYPE2*.

Why isn't int** type compatible to void** type?

What's your idea? Thanks.

On 1/22/2014 12:36 AM, Katayama Hirofumi MZ wrote:
> Hello, this is a Japanese programmer, katahiromz.
>
> If TYPE1 was compatible to TYPE2, I think TYPE1* should be compatible to TYPE2*.
>
> Why isn't int** type compatible to void** type?


While void is untyped data, void* is definitely typed data.

Because it is definitely unsafe.

void main()
{
    int n;
    int* pn = &n;
    int** ppn = &pn;

    void** ppv = ppn;   // if this is allowed...?

    double x;
    double* px = &x;

    // double* is implicitly convertible to void*
    *ppv = px;

    // Wow, now int** points the double* data!
    assert(*ppn is cast(void*)px);
}

Kenji Hara


2014/1/22 Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>

> Hello, this is a Japanese programmer, katahiromz.
>
> If TYPE1 was compatible to TYPE2, I think TYPE1* should be compatible to TYPE2*.
>
> Why isn't int** type compatible to void** type?
>
> What's your idea? Thanks.
>

Oh, I see. Thanks, Kenji san.

On Wednesday, 22 January 2014 at 09:04:31 UTC, Kenji Hara wrote:
> Because it is definitely unsafe.

On 01/22/2014 01:25 AM, Katayama Hirofumi MZ wrote:

> Oh, I see. Thanks, Kenji san.

Going off topic, that answers a question of mine! :) I could not be sure whether Kenji san, Hara san, or even Hara-san would be correct when I wrote to a Japanese person.

Ali

P.S. Going even more off topic, that person did not respond to my email yet. ;)

On Thursday, 23 January 2014 at 19:00:45 UTC, Ali Çehreli wrote:

> P.S. Going even more off topic, that person did not respond to my email yet. ;)

Maybe you actually did get it wrong? :)

On Thursday, 23 January 2014 at 19:00:45 UTC, Ali Çehreli wrote:
> On 01/22/2014 01:25 AM, Katayama Hirofumi MZ wrote:
>
> > Oh, I see. Thanks, Kenji san.
>
> Going off topic, that answers a question of mine! :) I could not be sure whether Kenji san, Hara san, or even Hara-san would be correct when I wrote to a Japanese person.
>
> Ali

All three are equally correct. Whether to use first or last name is similar to the equivalent split in the anglosphere. Using a hyphen is overwhelmingly common but not required in any system of romanization.

On 01/23/2014 11:09 AM, Stanislav Blinov wrote:
> On Thursday, 23 January 2014 at 19:00:45 UTC, Ali Çehreli wrote:
>
>> P.S. Going even more off topic, that person did not respond to my
>> email yet. ;)
>
> Maybe you actually did get it wrong? :)

I hope not. :)

Ali