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Clean ways to write multiple 'for' loops
...ch3d(B, [](double i){ std::cout << i << std::endl; });
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In order to make it N-ary we need some template magic. First of all we should create SFINAE structure to distinguish whether this value or container. The default implementation for values, and specialisations for arrays and each...
Using a strategy pattern and a command pattern
... are implementation classes that do addition, subtraction, multiplication, etc. Maybe those are not good examples?
– Joshua Davis
Jul 18 '11 at 16:45
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How do you use variables in a simple PostgreSQL script?
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Took me a while to figure out that in order to use the variable you must not prefix it with a : as with other variables. @achilles-ram-nakirekanti you could add an example using this in a select statement to make this clearer?
– exhuma
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Gunicorn worker timeout error
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Thanks this is the right answer. And then, in order to save resources with many concurrent connections: pip install gevent , then worker_class gevent in your config file or -k gevent on the command line.
– little_birdie
Jan 5 '16 a...
Postgres NOT in array
...&& and @> require both elements to be arrays, which 3 isn't. In order for this to work, the query would need to be written as: SELECT COUNT(*) FROM "messages" WHERE ARRAY[3] && recipient_ids.
– Dologan
Jun 14 '16 at 13:12
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How to update a git clone --mirror?
...us Skog: Great. Thanks! Is this all? Do I need another commmand, like git fetch? Or git remote update alone will do it all?
– J. Bruni
May 27 '11 at 11:40
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What is the most pythonic way to check if an object is a number?
...s scalar-like. If you have values of different type (i.e. string, numeric, etc.) coming through, then the logic of your program may need some work - how did you end up trying to multiply a string by a numeric vector in the first place?
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UITableView row animation duration and completion callback
...mSelectorOnMainThread:withObject:waitUntilDone:]; in setCompletionBlock in order to call your delegate in next runloop. if you call your delegate directly, without performSelectorOnMainThread, you get old value for tableView.contentSize.
– slamor
Sep 18 '13 at ...
Explicitly select items from a list or tuple
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Maybe a list comprehension is in order:
L = ['a', 'b', 'c', 'd', 'e', 'f']
print [ L[index] for index in [1,3,5] ]
Produces:
['b', 'd', 'f']
Is that what you are looking for?
s...
How can I pipe stderr, and not stdout?
...nd 2>&1 >/dev/null | grep 'something'
Here is what happens, in order:
a pipe (fifo) is created. "command FD1" is pointed to this pipe. "grep FD0" also is pointed to this pipe
"command FD2" is pointed to where "command FD1" currently points (the pipe)
"command FD1" is pointed to /dev/nu...