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What's the difference between the Dependency Injection and Service Locator patterns?
...ck implementations of its dependent objects. You could combine the two -- and inject the service locator (or a factory), if you wanted.
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What is this crazy C++11 syntax ==> struct : bar {} foo {};?
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First, we'll take a bog-standard abstract UDT (User-Defined Type):
struct foo { virtual void f() = 0; }; // normal abstract type
foo obj;
// error: cannot declare variable 'obj' to be of abstract type 'foo'
Let's also recall that we can instantiate...
Extracting specific columns from a data frame
I have an R data frame with 6 columns, and I want to create a new dataframe that only has three of the columns.
10 Answers
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Django Admin - Disable the 'Add' action for a specific model
I have a django site with lots of models and forms. I have many custom forms and formsets and inlineformsets and custom validation and custom querysets. Hence the add model action depends on forms that need other things, and the 'add model' in the django admin throughs a 500 from a custom queryset.
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What is the most “pythonic” way to iterate over a list in chunks?
...rks for any iterable (not just sequences as the above code); it is concise and probably just as fast or even faster. Though it might be a bit obscure (unclear) for people unfamiliar with itertools module.
– jfs
Jan 12 '09 at 14:39
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bundler vs RVM vs gems vs RubyGems vs gemsets vs system ruby [closed]
I am new to Ruby and trying to wrap my head around following concepts: bundler vs RVM vs gems vs RubyGems vs gemsets vs system rub and I'm confused.
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Python exit commands - why so many and when should each be used?
It seems that python supports many different commands to stop script execution. The choices I've found are: quit() , exit() , sys.exit() , os._exit()
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Is there a job scheduler library for node.js? [closed]
...hould be implemented? Should I just set callback to be called every second and check the time and start jobs scheduled for the time or what?
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Stored procedure slow when called from web, fast from Management Studio
...in the past, so I'm eager to see a resolution to this question. Aaron Bertrand's comment on the OP led to Query times out when executed from web, but super-fast when executed from SSMS, and while the question is not a duplicate, the answer may very well apply to your situation.
In essence, it sound...
How to convert View Model into JSON object in ASP.NET MVC?
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+1 I used Html.Raw, but never found Json.Encode and just used JavaScriptSerializer to add the string in the controller to the view model
– AaronLS
Aug 31 '12 at 23:14
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