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Singleton: How should it be used
... a new object instead of referencing an existing one? Since this is tagged C++, let's use an example from that language. Do you often accidentally write
std::ostream os;
os << "hello world\n";
When you intended to write
std::cout << "hello world\n";
Of course not. We don't need pro...
How should I unit test threaded code?
...
Tough one indeed! In my (C++) unit tests, I've broken this down into several categories along the lines of the concurrency pattern used:
Unit tests for classes that operate in a single thread and aren't thread aware -- easy, test as usual.
Unit tes...
Shortest distance between a point and a line segment
...wer mentioned is no longer the accepted one.
Here's some correct code, in C++. It presumes a class 2D-vector class vec2 {float x,y;}, essentially, with operators to add, subract, scale, etc, and a distance and dot product function (i.e. x1 x2 + y1 y2).
float minimum_distance(vec2 v, vec2 w, vec2 p...
source of historical stock data [closed]
...
they have a ActiveX API which you can call with c++ code or C# or whatever in windows to get to your data.
– lukebuehler
Jun 23 '13 at 17:05
1
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In Functional Programming, what is a functor?
...lds a container of type b.
Unlike the abstracted-function-pointer use in C++, here the functor is not the function; rather, it's something that behaves consistently when subjected to a function.
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What is Unicode, UTF-8, UTF-16?
...erally, you'll have to use a library that supports UTF, such as ICU for C, C++ and Java. In any case, if you want to input/output something other than the default encoding, you will have to convert it first.
Recommended/default/dominant encodings: When given a choice of which UTF to use, it is usua...
When to use Preorder, Postorder, and Inorder Binary Search Tree Traversal strategies
... create it.
Recursive Algorithms for Pre-order, In-order and Post-order (C++):
struct Node{
int data;
Node *left, *right;
};
void preOrderPrint(Node *root)
{
print(root->name); //record root
if (root->left != NULL) preOrderPrint(root->left); ...
How do malloc() and free() work?
...malloc" will crash, but you don't know why!
Those are some of the worst C/C++ problems, and one reason why pointers can be so problematic.
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foll...
When should I use malloc in C and when don't I?
... really messy really fast. This is one of the reasons I much prefer modern C++ over C in applicable cases, but that's a whole nother topic.
So whenever you use malloc, always make sure your memory is as likely to be freed as possible.
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Which characters make a URL invalid?
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@Mark Amery it's analogous to saying C++ is a superset of C. It is for the most part but not entirely true because (URL and C) is much older they have to include behavior that is less strict. The problem is URL parsers will parse things that are not valid URI......