Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p><strong>EDIT: This is now live in version 0.0.0.2 of UnconstrainedMelody.</strong></p> <p>(As requested on my <a href="http://codeblog.jonskeet.uk/2009/09/10/generic-constraints-for-enums-and-delegates/" rel="noreferrer">blog post about enum constraints</a>. I've included the basic facts below for the sake of a standalone answer.)</p> <p>The best solution is to wait for me to include it in <a href="https://github.com/jskeet/unconstrained-melody" rel="noreferrer">UnconstrainedMelody</a><sup>1</sup>. This is a library which takes C# code with "fake" constraints such as</p> <pre><code>where T : struct, IEnumConstraint </code></pre> <p>and turns it into</p> <pre><code>where T : struct, System.Enum </code></pre> <p>via a postbuild step.</p> <p>It shouldn't be too hard to write <code>IsSet</code>... although catering for both <code>Int64</code>-based and <code>UInt64</code>-based flags could be the tricky part. (I smell some helper methods coming on, basically allowing me to treat any flags enum as if it had a base type of <code>UInt64</code>.)</p> <p>What would you want the behaviour to be if you called</p> <pre><code>tester.IsSet(MyFlags.A | MyFlags.C) </code></pre> <p>? Should it check that <em>all</em> the specified flags are set? That would be my expectation.</p> <p>I'll try to do this on the way home tonight... I'm hoping to have a quick blitz on useful enum methods to get the library up to a usable standard quickly, then relax a bit.</p> <p>EDIT: I'm not sure about <code>IsSet</code> as a name, by the way. Options:</p> <ul> <li>Includes</li> <li>Contains</li> <li>HasFlag (or HasFlags)</li> <li>IsSet (it's certainly an option)</li> </ul> <p>Thoughts welcome. I'm sure it'll be a while before anything's set in stone anyway...</p> <hr> <p><sup>1</sup> or submit it as a patch, of course...</p>
    singulars
    1. This table or related slice is empty.
    1. POAnyone know a good workaround for the lack of an enum generic constraint?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USJon Skeet
    1. USJon Skeet
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POAnyone know a good workaround for the lack of an enum generic constraint?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    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 suppose if multiple flags are passed in it should check for all of them. My actual fix for this (back in 2008 when I asked it) was to have a template extension method for each flags enum - messy but works. Never bothered with the check for multiple flags because all the checks we have are for a single flag - not such a problem in internal only code but something that would need to be accounted for in an shared library.
      singulars
      1. PO
      1. USKeith
    2. COYou had to go and mention PostSharp LOL :o http://www.postsharp.org/blog/generic-constraints-for-enums-and-delegates
      singulars
      1. PO
      1. USSam Harwell
    3. COI would use the Flags-terminology simply because it already exists in .NET (see `FlagsAttribute`.) I see two explicit names here: `HasAnyFlag` and `HasAllFlags`. They can be shortened to `HasFlag` and `HasFlags`. I can't say which is best, it's a matter of taste I guess.
      singulars
      1. PO
      1. USBlixt
 

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