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How to pass parameters to ThreadStart method in Thread?
... (over ParameterizedThreadStart) is that you can pass multiple parameters, and you get compile-time checking without needing to cast from object all the time.
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Why doesn't Java offer operator overloading?
...s the compiler to create three (3) objects on the stack, perform addition, and copy the resultant value from the temporary object into the existing object a.
However, in Java, operator= doesn't perform value copy for reference types, and users can only create new reference types, not value types. S...
'setInterval' vs 'setTimeout' [duplicate]
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I have a div I want to display once the page loads and fade away after X seconds. Would using setTimeout with a function which changes the style to display none accomplish this?
– Batman
Feb 12 '13 at 21:02
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What does an exclamation mark mean in the Swift language?
...ome/None), not the value itself (T). So john isn't an instance of Person, and it doesn't have an apartment member:
john.apartment
// 'Person?' does not have a member named 'apartment'
The actual Person value can be unwrapped in various ways:
"forced unwrapping": john! (gives the Person value i...
Display names of all constraints for a table in Oracle SQL
...ctionary, specifically the USER_CONS_COLUMNS view to see the table columns and corresponding constraints:
SELECT *
FROM user_cons_columns
WHERE table_name = '<your table name>';
FYI, unless you specifically created your table with a lower case name (using double quotes) then the table na...
How to “comment-out” (add comment) in a batch/cmd?
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The rem command is indeed for comments. It doesn't inherently update anyone after running the script. Some script authors might use it that way instead of echo, though, because by default the batch interpreter will print out each command...
Extract subset of key-value pairs from Python dictionary object?
...bigdict.get(k, None) for k in ('l', 'm', 'n')}
If you're using Python 3, and you only want keys in the new dict that actually exist in the original one, you can use the fact to view objects implement some set operations:
{k: bigdict[k] for k in bigdict.keys() & {'l', 'm', 'n'}}
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Refresh all files in buffer from disk in vim
The command to refresh a file from version on disk is :e!
5 Answers
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Virtual functions and performance - C++
In my class design, I use abstract classes and virtual functions extensively. I had a feeling that virtual functions affects the performance. Is this true? But I think this performance difference is not noticeable and looks like I am doing premature optimization. Right?
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When would you use the different git merge strategies?
...is in larger projects where many branches have had independent development and it's all ready to come together into a single head.
An octopus branch merges multiple heads in one commit as long as it can do it cleanly.
For illustration, imagine you have a project that has a master, and then three b...