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Why should I declare a virtual destructor for an abstract class in C++?
I know it is a good practice to declare virtual destructors for base classes in C++, but is it always important to declare virtual destructors even for abstract classes that function as interfaces? Please provide some reasons and examples why.
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SQLite table constraint - unique on multiple columns
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If you already have a table and can't/don't want to recreate it for whatever reason, use indexes:
CREATE UNIQUE INDEX my_index ON my_table(col_1, col_2);
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How do I get the localhost name in PowerShell?
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Don't forget that all your old console utilities work just fine in PowerShell:
PS> hostname
KEITH1
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Why do people put code like “throw 1; ” and “for(;;);” in front of json responses? [du
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Even without the for(;;); how would the attacker get the data?
Attacks are based on altering the behaviour of the built-in types, in particular Object and Array, by altering their constructor function or its prototype. Then when the targete...
Good ways to sort a queryset? - Django
...rgetter to define a per-object key expression), which is what the OP asked for.
– PaulMcG
Mar 10 '10 at 1:39
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How to check if std::map contains a key without doing insert?
The only way I have found to check for duplicates is by inserting and checking the std::pair.second for false , but the problem is that this still inserts something if the key is unused, whereas what I want is a map.contains(key); function.
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How does Google's Page Speed lossless image compression work?
When you run Google's PageSpeed plugin for Firebug/Firefox on a website it will suggest cases where an image can be losslessly compressed, and provide a link to download this smaller image.
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Maximum number of records in a MySQL database table
What is the upper limit of records for MySQL database table. I'm wondering about autoincrement field. What would happen if I add milions of records? How to handle this kind of situations?
Thx!
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Github: error cloning my private repository
...checks completely by executing:
git config --system http.sslverify false
For both cases, this will result in changes to [git-install-dir]/etc/gitconfig file, which may be edited directly, too.
(Original solutions found at http://github.com/blog/642-smart-http-support)
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How to colorize diff on the command line?
When I have a diff, how can I colorize it so that it looks good? I want it for the command line, so please no GUI solutions.
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