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When should I use the Visitor Design Pattern? [closed]
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(Suppose it is a complex hierarchy with a well-established interface.)
Now we want to add a new operation to the hierarchy, namely we want each animal to make its sound. As far as the hierarchy is this simple, you can do it with straight polymorphism:
class Animal
{ public: virtual void makeSou...
How can I get a user's media from Instagram without authenticating as a user?
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@MattFletcher it's even more stupid now, one must go through app permission review, and not sure if it's even feasible since this use case "showing client's own feed in their own webpage" is not one of the use cases. Duh, these restrictions suck.
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Assign a variable inside a Block to a variable outside a Block
...Person *strongPerson = [Person new];
__weak Person *weakPerson = person;
Now you can refer weakPerson object inside block.
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How can I do a line break (line continuation) in Python?
...ly PEP-8 has changed since these comments were added, as it's fairly clear now that parentheses should be added to wrap long lines: "Long lines can be broken over multiple lines by wrapping expressions in parentheses."
– Daniel
Feb 8 '12 at 9:04
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Remove last character from string. Swift language
...oIndex. Also, as of Xcode 7, string no longer has a .count property, it is now only applied to characters: string.characters.count
– kakubei
Jul 22 '15 at 15:18
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Chrome Extension how to send data from content script to popup.html
I know this this has been asked in numerous posts but honestly I don't get them. I am new to JavaScript, Chrome Extensions and everything and I have this class assignment.
So I need to make a plugin that would count DOM objects on any given page using Cross Domain Requests.
I've been able to achiev...
How do I use spaces in the Command Prompt?
...whole command had to be enclosed again by another pair of quotation marks. Now it works! Thanks!
– Arise
May 30 '13 at 6:36
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String concatenation: concat() vs “+” operator
...ring cat(String a, String b) {
a += b;
return a;
}
}
Now disassemble with javap -c (included in the Sun JDK). You should see a listing including:
java.lang.String cat(java.lang.String, java.lang.String);
Code:
0: new #2; //class java/lang/StringBuilder
3: dup
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What is function overloading and overriding in php?
...ue;
$a=doSomething();
Each variable is of a different type, yet you can know the type before execution (see the 4th one).
As a comparison, other languages use:
int a=1;
String s="1";
bool a=true;
something a=doSomething();
In the last example, you must forcefully set the variable's type (as an ...
Python - Create a list with initial capacity
...;< name << ": ";
auto start = chrono::high_resolution_clock::now();
for (unsigned int i = 0; i < Iterations; ++i) {
fn();
}
auto end = chrono::high_resolution_clock::now();
auto elapsed = end - start;
cout << chrono::duration<double, milli>(e...