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What is the copy-and-swap idiom?
...rray); // (3)
}
return *this;
}
And we say we're finished; this now manages an array, without leaks. However, it suffers from three problems, marked sequentially in the code as (n).
The first is the self-assignment test. This check serves two purposes: it's an easy way to prevent us fr...
How can you represent inheritance in a database?
...problems identified for the single table method:
Mandatory attributes can now be enforced with NOT NULL.
Adding a new subtype requires adding a new table instead of adding columns to an existing one.
There is also no risk that an inappropriate attribute is set for a particular subtype, such as th...
When restoring a backup, how do I disconnect all active connections?
...nd select 'Activity Monitor'.
When this opens, expand the Processes group.
Now use the drop-down to filter the results by database name.
Kill off the server connections by selecting the right-click 'Kill Process' option.
sh...
How do you fork your own repository on GitHub?
...new project based on this repository, but I don't want to affect how it is now. I tried forking it using the GitHub UI but it didn't do anything.
...
What is this Javascript “require”?
...b browser with a limited global context defined mostly by what came to be known as the Document Object Model (DOM) level 0 (the Netscape Navigator Javascript API).
Server-side Javascript eliminates that restriction and allows Javascript to call into various pieces of native code (like the Postgres ...
Why are Oracle table/column/index names limited to 30 characters?
...understand that many years ago there would be this kind of limitation, but nowadays surely this limit could easily be increased. We have naming conventions for objects, but there is always a case that turns up where we hit this limit - especially in naming foreign keys.
...
Error in finding last used cell in Excel with VBA
... It is highly unreliable. Try this experiment.
Type something in cell A5. Now when you calculate the last row with any of the methods given below, it will give you 5. Now color the cell A10 red. If you now use the any of the below code, you will still get 5. If you use Usedrange.Rows.Count what do ...
Visual Studio Copy Project
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This is incredibly useful, how did I not know about this before? Thanks!
– Aldarrion
Jan 8 '18 at 17:23
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Handling file renames in git
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In git 1.9.1 git status now behaves like git commit.
– Jacques René Mesrine
Oct 5 '15 at 16:11
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Create a devise user from Ruby console
...e, make sure you are setting the confirmed_at value to something like Time.now while creating.
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