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Best practices for circular shift (rotate) operations in C++
...tate question with some more details about what asm gcc/clang produce for x86.
The most compiler-friendly way to express a rotate in C and C++ that avoids any Undefined Behaviour seems to be John Regehr's implementation. I've adapted it to rotate by the width of the type (using fixed-width types l...
Pip freeze vs. pip list
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Eric Platon
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answered Sep 23 '13 at 18:49
karthikrkarthikr...
Commands executed from vim are not recognizing bash command aliases
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answered Jan 10 '11 at 0:48
Josh LeeJosh Lee
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Odd behavior when Java converts int to byte?
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In Java, an int is 32 bits. A byte is 8 bits .
Most primitive types in Java are signed, and byte, short, int, and long are encoded in two's complement. (The char type is unsigned, and the concept of a sign is not applicable to boolean.)
In this number scheme t...
How do I get the key at a specific index from a Dictionary in Swift?
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Iulian Onofrei
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answered Jul 8 '14 at 20:20
Mick MacCallumMick Mac...
Ruby: How to get the first character of a string
...ial # prints S
The other method mentioned here doesn't work on Ruby 1.8 (not that you should be using 1.8 anymore anyway!--but when this answer was posted it was still quite common):
puts 'Smith'[0] # prints 83
Of course, if you're not doing it on a regular basis, then defining the...
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
...SELECT string_agg(actor_name, ', ' ORDER BY first_appearance)
PostgreSQL 8.4 or later:
PostgreSQL 8.4 (in 2009) introduced the aggregate function array_agg(expression) which concatenates the values into an array. Then array_to_string() can be used to give the desired result:
SELECT company_id, a...
mysql_config not found when installing mysqldb python interface
...eference:
https://github.com/JudgeGirl/Judge-sender/issues/4#issuecomment-186542797
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No secret option provided to Rack::Session::Cookie warning?
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This is a Rails bug, as the subclass is violating the superclass API contract.
The warn...
How to filter out files by extension in NERDTree?
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edited Apr 8 '11 at 23:45
answered Apr 8 '11 at 23:40
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