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What is the performance cost of having a virtual method in a C++ class?
...rying about the cost unless the function is something like a trivial Get()/Set() accessor, in which anything other than inline is kind of wasteful. A 7ns overhead on a function that inlines to 0.5ns is severe; a 7ns overhead on a function that takes 500ms to execute is meaningless.
The big cost of ...
Synchronizing a local Git repository with a remote one
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These steps will do it:
git reset --hard HEAD
git clean -f -x -d -n
then without -n
This will take care of all local changes. Now the commits...
git status
and note the line such as:
Your branch is ahead of 'xxxx' by N commits.
Take a note of num...
More elegant way of declaring multiple variables at the same time
...t may make sense to use a dictionary instead. For example, if you want to set up Boolean preset values for a set of one-letter flags, you could do this:
>>> flags = dict.fromkeys(["a", "b", "c"], True)
>>> flags.update(dict.fromkeys(["d", "e"], False))
>>> print flags
{'...
Compile time string hashing
...ce c1c2...ck can
only contain characters from the basic source character set. —end note]
Combine that with constexpr and we should have compile time string processing.
update: i overlooked that i was reading the wrong paragraph, this form is allowed for user-defined-integer-literals and -flo...
How to send a command to all panes in tmux?
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Have you tried following in tmux window with multiple panes
Ctrl-B :
setw synchronize-panes on
clear history
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How can I time a code segment for testing performance with Pythons timeit?
... you already do in you example code and timeit does automatically when you set its number argument)
import time
def myfast():
code
n = 10000
t0 = time.time()
for i in range(n): myfast()
t1 = time.time()
total_n = t1-t0
In Windows, as Corey stated in the comment, time.clock() has much higher...
What is “lifting” in Haskell?
...nction into a corresponding function within another (usually more general) setting
take a look at http://haskell.org/haskellwiki/Lifting
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How to determine an interface{} value's “real” type?
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Least common multiple for 3 or more numbers
How do you calculate the least common multiple of multiple numbers?
31 Answers
31
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List comprehension vs map
Is there a reason to prefer using map() over list comprehension or vice versa? Is either of them generally more efficient or considered generally more pythonic than the other?
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