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Pure virtual destructor in C++
...::~A() { }
should suffice.
And since this got a down vote, I should clarify: If you derive anything from A and then try to delete or destroy it, A's destructor will eventually be called. Since it is pure and doesn't have an implementation, undefined behavior will ensue. On one popular platform, t...
do {…} while(false)
...ode, but doing something like this is just an idiotically disguised goto. If you think a goto is the right tool for the job, then you should just use a #$(*#@ goto.
– dsimcha
Feb 22 '10 at 20:55
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INSERT statement conflicted with the FOREIGN KEY constraint - SQL Server
...olumn that is not also in the primary key column of the referenced table.
If you have SQL Server Management Studio, open it up and sp_help 'dbo.Sup_Item_Cat'. See which column that FK is on, and which column of which table it references. You're inserting some bad data.
Let me know if you need anyt...
Getting the difference between two sets
So if I have two sets:
7 Answers
7
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Git status ignore line endings / identical files / windows & linux environment / dropbox / mled
...repo is in Dropbox (I don't need a public repository) that's probably the difference
– Thorsten Niehues
Dec 13 '13 at 10:46
3
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Alternate background colors for list items
...
If you want to do this purely in CSS then you'd have a class that you'd assign to each alternate list item. E.g.
<ul>
<li class="alternate"><a href="link">Link 1</a></li>
<li><...
Android get color as string value
If i defined a color in resources
11 Answers
11
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Rank function in MySQL
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+1 for the devious inline initialization, that's a beautiful trick.
– Charles
Jul 26 '10 at 9:42
29
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How to calculate moving average without keeping the count and data-total?
... Beware that this is quite far from the common definition of average. If you set N = 5 and enter 5 5 samples, the average will be 0.67.
– Dan Dascalescu
Jan 9 '18 at 8:28
2
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Force page scroll position to top at page refresh in HTML
...ent.querySelector('html').style.scrollBehavior = ''; may be necessary too. If it was set to smooth, it might not get to the top before the page reloads.
– kevnk
Oct 17 '19 at 20:51
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