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How to implement classic sorting algorithms in modern C++?
...ithm (and its cousins std::partial_sort and std::nth_element ) from the C++ Standard Library is in most implementations a complicated and hybrid amalgamation of more elementary sorting algorithms , such as selection sort, insertion sort, quick sort, merge sort, or heap sort.
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Memory management in Qt?
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If your MyClass is not a child of QObject, you’ll have to use the plain C++ way of doing things.
Also, note that the parent–child hierarchy of QObjects is generally independent of the hierarchy of the C++ class hierarchy/inheritance tree. That means, that an assigned child does not need to be ...
Return type of '?:' (ternary conditional operator)
...on't have return types, they have a type and - as it's known in the latest C++ standard - a value category.
A conditional expression can be an lvalue or an rvalue. This is its value category. (This is somewhat of a simplification, in C++11 we have lvalues, xvalues and prvalues.)
In very broad and si...
How can I scan barcodes on iOS?
...specifically, you want to take a look at the iPhone client and the partial C++ port of the core library. The port is a little old, from circa the 0.9 release of the Java code, but should still work reasonably well.
If you need to scan other formats, like 1D formats, you could continue the port of t...
What does the unary plus operator do?
...of "comment" denoting that an integer is positive. Consider the following C++ program:
void foo(unsigned short x)
{
std::cout << "x is an unsigned short" << std::endl;
}
void foo(int x)
{
std::cout << "x is an int" << std::endl;
}
int main()
{
unsigned short x = 5;
fo...
What is the advantage of using forwarding references in range-based for loops?
...constantly experimenting and pushing for better ways of doing things, that C++ continues to evolve. Thank you. :-)
– Howard Hinnant
Oct 29 '12 at 23:13
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Why is list initialization (using curly braces) better than the alternatives?
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Basically copying and pasting from Bjarne Stroustrup's "The C++ Programming Language 4th Edition":
List initialization does not allow narrowing (§iso.8.5.4). That is:
An integer cannot be converted to another integer that cannot hold its value. For example, char
to int is allowed,...
Link to all Visual Studio $ variables
...mething akin to a printenv command) list of defined variables for a Visual C++ project on my machine. Probably not all macros are defined for others (e.g. OCTAVE_EXECUTABLE), but I wanted to err on the side of inclusiveness here.
For example, this is the first time that I see $(Language) (expanding...
clearing a char array c
... achieve this.
On the other hand, if you are choosing to view this as a C/C++ null terminated string, setting the first byte to 0 will effectively clear the string.
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OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
...some modifications to the squares demo present in OpenCV and the resulting C++ code below is able to detect a sheet of paper in the image:
void find_squares(Mat& image, vector<vector<Point> >& squares)
{
// blur will enhance edge detection
Mat blurred(image);
medianB...