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What is an example of the Liskov Substitution Principle?
...class; this seems perfectly logical. However if your Rectangle reference pointed to a Square, then SetWidth and SetHeight doesn't make sense because setting one would change the other to match it. In this case Square fails the Liskov Substitution Test with Rectangle and the abstraction of having Squ...
Storing sex (gender) in database
...umber/Range of Values
------------------------------------------------
TinyINT 1 255 (zero to 255)
INT 4 - 2,147,483,648 to 2,147,483,647
BIT 1 (2 if 9+ columns) 2 (0 and 1)
CHAR(1) 1 26 if case insensitive, 52 otherwise...
Downcasting in Java
...ll be disallowed at compile time, because they will never succeed at all:
Integer i = getSomeInteger();
String s = (String) i; // the compiler will not allow this, since i can never reference a String.
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'size_t' vs 'container::size_type'
..." At the time, size_t was the bet practical implementation of those constraints. However, in C++11, it is now defined essentially as: std::make_unsigned<X::difference_type>::type by default. Which in practice, will probably be the same or compatible with size_t.
– Evan Te...
Find the most frequent number in a numpy vector
...
If your list contains all non-negative ints, you should take a look at numpy.bincounts:
http://docs.scipy.org/doc/numpy/reference/generated/numpy.bincount.html
and then probably use np.argmax:
a = np.array([1,2,3,1,2,1,1,1,3,2,2,1])
counts = np.bincount(a)
print(n...
Calling constructors in c++ without new
...t reason. Of course it is possible that creating of the first instance is intentional for some side effects, but that's even worse (stylistically).
– MK.
Apr 27 '10 at 16:16
3
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Why are const parameters not allowed in C#?
...good answers, I'll add yet another reason why to not put C-style constness into C#. You said:
we mark parameter as const in order to be sure that its state will not be changed in method.
If const actually did that, that would be great. Const doesn't do that. The const is a lie!
Const doesn't...
How do getters and setters work?
...is if you call someObj.getTime().setHour(5) it should not affect someObj's internal state. Also setters and getters (accessors and mutators by their fancier name) have a very strict method signature meaning that getter doesn't have any parameters. Methods in general should only do one thing anyway.
...
printf format specifiers for uint32_t and size_t
...he same as unsigned long (possibly 64 bits) when it's actually an unsigned int (32 bits). Try using %zu in both cases.
I'm not entirely certain though.
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How can I use Async with ForEach?
...for the same reasons).
In this case, I recommend projecting each element into an asynchronous operation, and you can then (asynchronously) wait for them all to complete.
using (DataContext db = new DataLayer.DataContext())
{
var tasks = db.Groups.ToList().Select(i => GetAdminsFromGroupAsyn...