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What is the copy-and-swap idiom?
...n achieving two things: avoiding code duplication, and providing a strong exception guarantee.
How does it work?
Conceptually, it works by using the copy-constructor's functionality to create a local copy of the data, then takes the copied data with a swap function, swapping the old data with the ...
How to get all selected values from ?
... answered Aug 6 '12 at 0:22
Felix KlingFelix Kling
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Escape quotes in JavaScript
... open to entry by a user at the company -- meaning, I'm not worried about XSS ).
13 Answers
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Why does changing the sum order returns a different result?
...e points at which the values are rounded, based on their magnitude. As an example of the kind of thing that we're seeing, let's pretend that instead of binary floating point, we were using a decimal floating point type with 4 significant digits, where each addition is performed at "infinite" precisi...
Will using goto leak variables?
...swer pertains to C++ only; the rules are quite different in C.
Won't x be leaked?
No, absolutely not.
It is a myth that goto is some low-level construct that allows you to override C++'s built-in scoping mechanisms. (If anything, it's longjmp that may be prone to this.)
Consider the follow...
What is the coolest thing you can do in
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.NET WPF Remember window size between sessions
...pe double
Left of type double
Height of type double
Width of type double
Maximized of type bool - to hold whether the window is maximized or not. If you want to store more information then a different type or structure will be needed.
Initialise the first two to 0 and the second two to the default...
How to update a plot in matplotlib?
... the figure here. I allow the user to specify the units in the time scale (x-axis) and then I recalculate and call this function plots() . I want the plot to simply update, not append another plot to the figure.
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Multiple variables in a 'with' statement?
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It is possible in Python 3 since v3.1 and Python 2.7. The new with syntax supports multiple context managers:
with A() as a, B() as b, C() as c:
doSomething(a,b,c)
Unlike the contextlib.nested, this guarantees that a and b will have their __exit__()'s called even if C() or it's __enter__()...
Best way to make Java's modulus behave like it should with negative numbers?
...- a / b * b; i.e. it's the remainder.
You can do (a % b + b) % b
This expression works as the result of (a % b) is necessarily lower than b, no matter if a is positive or negative. Adding b takes care of the negative values of a, since (a % b) is a negative value between -b and 0, (a % b + b) is...