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What is “rvalue reference for *this”?
...e the first example at the top of this post. After the aforementioned transformation, the overload-set looks something like this:
void f1(test&); // will only match lvalues, linked to 'void test::f() &'
void f2(test&&); // will only match rvalues, linked to 'void test::f() &&...
Why does C++ not have reflection?
...ndard
library relies on this aggressive
optimization. Functors are only
performant if the overhead of
instantiating and destructing the
object can be optimized away.
operator[] on a vector is only comparable to raw
array indexing in performance
because the entire operator can be
inlined and thus rem...
Fundamental difference between Hashing and Encryption algorithms
...w combines the resultant states from all these iterations back together to form the resultant hash.
Now, if you wanted to decode the hash, you'd first need to figure out how to split the given hash into its iterated states (1 possibility for inputs smaller than the size of a chunk of data, many for...
What encoding/code page is cmd.exe using?
...
@user200783, decomposed form isn't supported; usually one can transform to an NFC equivalent. Also, the console in Western locales doesn't allow mixing full-width and half-width glyphs. Also, when using codepage 65001 (UTF-8), prior to Windows 8 Wri...
C++ equivalent of java's instanceof
...inted out dynamic_cast doesn't come for free. A simple and consistently performing hack that handles most (but not all cases) is basically adding an enum representing all the possible types your class can have and check whether you got the right one.
if(old->getType() == BOX) {
Box* box = st...
Protect .NET code from reverse engineering?
...pack them. The tutorial How to write your own packer gives a ton of good information on writing your own Win32 packer.
Ultimately though, if people want your application cracked they will. Look at all the commercial software out there that has a vast amount of resources to protect their applicatio...
When is the thread pool used?
... in javascript, you're probably making a mistake. Other languages will perform much more efficiently.
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What is the correct way of using C++11's range-based for?
...r (const auto& elem : container)
syntaxes are wrong.
In fact, in the former case, elem stores a copy of the original
element, so modifications done to it are just lost and not stored persistently
in the container, e.g.:
vector<int> v = {1, 3, 5, 7, 9};
for (auto x : v) // <-- captu...
What is the best way to compute trending topics or tags?
... using the average.
In your case a z-score is calculated by the following formula, where the trend would be a rate such as views / day.
z-score = ([current trend] - [average historic trends]) / [standard deviation of historic trends]
When a z-score is used, the higher or lower the z-score the mo...
How do you rotate a two dimensional array?
...al number of layers in the matrix. This occurs when the innermost layer is formed of only one element (i.e. a 1×1 matrix) and therefore need not be rotated. It simply gets ignored.
We will undoubtedly need this information in our function to rotate a matrix, so let’s add it now:
def rotate(matr...