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How does std::forward work? [duplicate]
I know what it does and when to use it but I still can't wrap my head around how it works. Please be as detailed as possible and explain when std::forward would be incorrect if it was allowed to use template argument deduction.
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How to find the size of localStorage
...n("\n"));
P.S. Snippets are updated according to request in the comment. Now the calculation includes the length of the key itself.
Each length is multiplied by 2 because the char in javascript stores as UTF-16 (occupies 2 bytes)
P.P.S. Should work both in Chrome and Firefox.
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Why prefer two's complement over sign-and-magnitude for signed numbers?
... to 4 bits for size). In the two's complement way, they are 0010 and 1111. Now, let's say I want to add them.
Two's complement addition is very simple. You add numbers normally and any carry bit at the end is discarded. So they're added as follows:
0010
+ 1111
=10001
= 0001 (discard the carry)
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Comma in C/C++ macro
...tructs behind the macro become dependent types, and the typename prefix is now required on the type. You can add it, but type deduction has been broken, so you now have to manually list the type arguments to call the function. I ended up using temple's method of defining a macro for the comma. It mi...
How to create module-wide variables in Python? [duplicate]
...name.
Imagine a file called foo.py, containing this single line:
X = 1
Now imagine you import it.
import foo
print(foo.X) # prints 1
However, let's suppose you want to use one of your module-scope variables as a global inside a function, as in your example. Python's default is to assume tha...
How to add property to a class dynamically?
...
I suppose I should expand this answer, now that I'm older and wiser and know what's going on. Better late than never.
You can add a property to a class dynamically. But that's the catch: you have to add it to the class.
>>> class Foo(object):
... ...
XmlSerializer: remove unnecessary xsi and xsd namespaces
...private XmlSerializerNamespaces _namespaces;
}
That's all to this class. Now, some objected to having an XmlSerializerNamespaces object somewhere within their classes; but as you can see, I neatly tucked it away in the default constructor and exposed a public property to return the namespaces.
No...
window.close and self.close do not close the window in Chrome
...n I invoke window.close() or self.close() it doesn't close the window. Now there seems to be a belief that in Chrome you can't close by script any window that is not script created. That is patently false but regardless it is supposed to still do it, even if it requires to pop up an alert to con...
Is module __file__ attribute absolute or relative?
... relative path:
Module __file__ attributes (and related values) should now always contain absolute paths by default, with the sole exception of __main__.__file__ when a script has been executed directly using a relative path. (Contributed by Brett Cannon in bpo-18416.)
Not sure if it resolves ...
How to create a trie in Python
... I'd stick with dict.setdefault() (it's underutilised and not nearly well-known enough), in part because it helps prevent bugs that are too easy to create with a defaultdict (where you'd not get a KeyError for non-existing keys on indexing). The only thing now that would make it useable for producti...