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Why do we need virtual functions in C++?
...public Animal
{
public: std::string Says() { return "Woof"; }
};
void test()
{
Dog* d = new Dog();
Animal* a = d; // refer to Dog instance with Animal pointer
std::cout << d->Says(); // always Woof
std::cout << a->Says(); // Woof or ?, depends on vir...
Why git can't remember my passphrase under Windows
...matically.
Add your SSH key to the agent with ssh-add on the command line.
Test git integration, if it still asks for your passphrase, continue on.
Add the environment variable $ENV:GIT_SSH=C:\Windows\System32\OpenSSH\ssh.exe to your session, or permanently to your user environment.
Detailed Ste...
Business logic in MVC [closed]
....
The model is ultimately gatekeeper for your data. You should be able to test your business logic without touching the UI at all.
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How to recover stashed uncommitted changes
...Try without --index.
You're using git stash save --keep-index in order to test "what will be committed". This one is beyond the scope of this answer; see this other StackOverflow answer instead.
For complicated cases, I recommend starting in a "clean" working directory first, by committing any c...
Regular cast vs. static_cast vs. dynamic_cast [duplicate]
...ncludes a complete Base object.
class MyBase
{
public:
virtual void test() {}
};
class MyChild : public MyBase {};
int main()
{
MyChild *child = new MyChild();
MyBase *base = dynamic_cast<MyBase*>(child); // ok
}
The next example attempts to convert a MyBase pointer to a MyChi...
Simulating tremor (from e.g. Parkinson's Disease) with the mouse on a webpage?
...ys end the script when the user wants to. This most notably happens during testing in interactive shells, but it can sometimes happen even in scripts. Even better would be while xdotool ... && xdotool ... && sleep ...; do :; done.
– user743382
A...
Is Java Regex Thread Safe?
...
@DavidTonhofer I think our latest JDK may have the correct bug-free code, but since Java's intermediate .class files can be interpreted on any platform by any compatible VM, you can't be sure those fixes exist in that runtime. Of course most of the time ...
What is the logic behind the “using” keyword in C++?
...llowed, instead use Bjarne Stroustrup function pointer alias example
using test = std::cos(double);
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Perform debounce in React.js
...e persist allows you to avoid putting the event back in the pool.
You can test these 2 behaviors here: JsFiddle
Read Julen's answer for an example of using persist() with a throttle/debounce function.
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Zoom in on a point (using scale and translate)
...own, check it out here http://www.dominicpettifer.co.uk/Files/Mosaic/MosaicTest.html Wait for the images to download then use your mouse wheel to zoom, also supports panning by dragging the image around. It's using CSS3 Transforms but you should be able to use the same calculations for your Canvas.
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