Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <blockquote> <p>When writing code, and thinking about cross-platform support (e.g. for general-use libraries), what sort of consideration is it worth giving to platforms with non-8-bit char?</p> </blockquote> <p>It's not so much that it's "worth giving consideration" to something as it is playing by the rules. In C++, for example, the standard says all bytes will have "at least" 8 bits. If your code assumes that bytes have exactly 8 bits, you're violating the standard.</p> <p>This may seem silly now -- "<em>of course</em> all bytes have 8 bits!", I hear you saying. But lots of very smart people have relied on assumptions that were not guarantees, and then everything broke. History is replete with such examples.</p> <p>For instance, most early-90s developers assumed that a particular no-op CPU timing delay taking a fixed number of cycles would take a fixed amount of clock time, because most consumer CPUs were roughly equivalent in power. Unfortunately, computers got faster very quickly. This spawned the rise of boxes with "Turbo" buttons -- whose purpose, ironically, was to slow the computer down so that games using the time-delay technique could be played at a reasonable speed.</p> <hr> <p>One commenter asked where in the standard it says that char must have at least 8 bits. It's in section <strong><a href="http://c0x.coding-guidelines.com/5.2.4.2.1.html" rel="noreferrer">5.2.4.2.1</a></strong>. This section defines <code>CHAR_BIT</code>, the number of bits in the smallest addressable entity, and has a default value of 8. It also says:</p> <blockquote> <p>Their implementation-defined values shall be equal or greater in magnitude (absolute value) to those shown, with the same sign.</p> </blockquote> <p>So any number equal to 8 or higher is suitable for substitution by an implementation into <code>CHAR_BIT</code>.</p>
    singulars
    1. This table or related slice is empty.
    1. POWhat platforms have something other than 8-bit char?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USJohn Feminella
    1. USJohn Feminella
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI haven't seen a Turbo button in at least 20 years - do you really think it's germane to the question?
      singulars
      1. PO
      1. USMark Ransom
    2. CO@Mark Ransom: That's the whole point. Developers often rely on assumptions which seem to be true at the moment, but which are much shakier than they initially appear. (Can't count the number of times I've made _that_ mistake!) The Turbo button should be a painful reminder not to make unnecessary assumptions, and certainly not to make assumptions that aren't guaranteed by a language standard as if they were immutable facts.
      singulars
      1. PO
      1. USJohn Feminella
    3. COCould you point out to place in C++ Standard which says that the bye has at least 8 bits? It is a common belief however I personally failed to find it in the Standard. The only thing I found in Standard is which characters must be representable by `char` there are more then 64 of them but less that 128 so 7 bits would be enough.
      singulars
      1. PO
      1. USAdam Badura
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload