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When is a C++ destructor called?
...rwise, means it uses ::operator new). Then, when you use (for example) push_back to add an item to the vector, internally the vector uses a placement new to create an item in the (previously) unused part of its memory space.
Now, what happens when/if you erase an item from the vector? It can't just ...
How do I declare a 2d array in C++ using new?
...nah, it's not clever at all: it's obvious.
class Matrix
{
...
size_t index( int x, int y ) const { return x + m_width * y; }
};
Given this index() function (which I'm imagining is a member of a class because it needs to know the m_width of your matrix), you can access cells within your ma...
How are people managing authentication in Go? [closed]
...-nuts mailing list:
https://groups.google.com/forum/#!msg/golang-nuts/GE7a_5C5kbA/fdSnH41pOPYJ
This provides a suggested schema and server-side implementation as a basis for custom authentication. The client-side code is still up to you.
(I hope the author of the post sees this: Thanks!)
Excerpt...
Disable developer mode extensions pop up in Chrome
...er",(System.getProperty("user.dir") + "//src//test//resources//chromedriver_new.exe"));
driver = new ChromeDriver(options);
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SQLite - UPSERT *not* INSERT or REPLACE
...re the old value and the new value for any field.
– G__
Apr 1 '11 at 16:56
24
If the Employee is ...
jQueryUI Tooltips are competing with Twitter Bootstrap
...javascript" src="/js/bootstrap.js"></script>
<script>var _tooltip = jQuery.fn.tooltip;</script>
<script type="application/javascript" src="/js/jquery-ui.js"></script>
<script>jQuery.fn.tooltip = _tooltip;</script>
This will override jquery-ui'...
Understanding ibeacon distancing
...curacy. Following URLs to start with: http://en.wikipedia.org/wiki/Standard_error, http://en.wikipedia.org/wiki/Uncertainty
In physical world, when you make some measurement, you always get different results (because of noise, distortion, etc) and very often results form Gaussian distribution. Ther...
Passing arguments to C# generic new() of templated type
... is:
// this delegate is just, so you don't have to pass an object array. _(params)_
public delegate object ConstructorDelegate(params object[] args);
public static ConstructorDelegate CreateConstructor(Type type, params Type[] parameters)
{
// Get the constructor info for these parameters
...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...e multiplies in it, no divide. => Faster!
And: the full update step new_x = x + dx then reads:
x *= 3/2 - y/2 * x * x which is easy too.
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What are bitwise shift (bit-shift) operators and how do they work?
...d |
To get at the green value you would do this:
#define GREEN_MASK 0x7E0
#define GREEN_OFFSET 5
// Read green
uint16_t green = (pixel & GREEN_MASK) >> GREEN_OFFSET;
Explanation
In order to obtain the value of green ONLY, which starts at offset 5 and ends at 10 (i.e. ...