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Should I pass an std::function by const-reference?
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As usual in C++11, passing by value/reference/const-reference depends on what you do with your argument. std::function is no different.
Passing by value allows you to move the argument into a variable (typically a member variable of a c...
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?
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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]
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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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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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