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C++ unordered_map using a custom class type as the key
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To be able to use std::unordered_map (or one of the other unordered associative containers) with a user-defined key-type, you need to define two things:
A hash function; this must be a class that overrides operator() and calculates the hash value given an object o...
CSS Child vs Descendant selectors
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One important note is that a child selector is going to be faster than descendant selector, which can have a visible affect on pages with 1000's of DOM elements.
– Jake Wilson
Mar 22 '12...
Python (and Python C API): __new__ versus __init__
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There are probably other uses for __new__ but there's one really obvious one: You can't subclass an immutable type without using __new__. So for example, say you wanted to create a subclass of tuple that can contain only integral values between 0 and size.
class ModularTuple(tu...
Tool to convert Python code to be PEP8 compliant
...little better than you found it:
pip install pep8radius
Suppose you've done your work off of master and are ready to commit:
# be somewhere in your project directory
# see the diff with pep, see the changes you've made since master
pep8radius master --diff
# make those changes
pep8radius master...
How to flip windows in vim? [duplicate]
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If you have them split vertically C-wJ to move one to the bottom
If you have them split horizontally C-wL to move one to the right
To rotate in a 'column' or 'row' of split windows, C-wC-r
The following commands can be used to change the window layout. For example,...
How to use a link to call JavaScript?
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I'd recommend the second one, as the first one scrolls you to the top of the page.
– Matt Grande
Mar 27 '09 at 1:39
7
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HTTP redirect: 301 (permanent) vs. 302 (temporary)
...e history in the back button for example, to avoid going back to the wrong one in a 301? Silently altering a bookmark upon 301 if you click in an old one?
– Xavi Montero
Sep 17 '14 at 10:26
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Remove all the elements that occur in one list from another
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One way is to use sets:
>>> set([1,2,6,8]) - set([2,3,5,8])
set([1, 6])
Note, however, that sets do not preserve the order of elements, and cause any duplicated elements to be removed. The elements also need to be h...
var functionName = function() {} vs function functionName() {}
I've recently started maintaining someone else's JavaScript code. I'm fixing bugs, adding features and also trying to tidy up the code and make it more consistent.
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HTTP vs HTTPS performance
...JMeter and Visual Studio come to mind) and they are quite easy to use.
No one can give you a meaningful answer without some information about the nature of your web site, hardware, software, and network configuration.
As others have said, there will be some level of overhead due to encryption, but...