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Enum type constraints in C# [duplicate]
... sure there is a method behind the madness, but I'd like to understand why it's not possible.
6 Answers
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Complex CSS selector for parent of active child [duplicate]
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Unfortunately, there's no way to do that with CSS.
It's not very difficult with JavaScript though:
// JavaScript code:
document.getElementsByClassName("active")[0].parentNode;
// jQuery code:
$('.active').parent().get(0); // This would be the <a>'s parent &l...
How to insert an item into an array at a specific index (JavaScript)?
...t is the splice function on the native array object.
arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert).
In this example we will create an array and add an element to it into index 2:
var arr = [];
arr[0] = "Jan...
jQuery.parseJSON throws “Invalid JSON” error due to escaped single quote in JSON
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According to the state machine diagram on the JSON website, only escaped double-quote characters are allowed, not single-quotes. Single quote characters do not need to be escaped:
Update - More information for those that are interested:
Douglas Crockford does not specifica...
What's is the difference between include and extend in use case diagram?
...case adds steps to another first-class use case.
For example, imagine "Withdraw Cash" is a use case of an Automated Teller Machine (ATM). "Assess Fee" would extend Withdraw Cash and describe the conditional "extension point" that is instantiated when the ATM user doesn't bank at the ATM's owning...
Differences between cookies and sessions?
...t JSP & Servlets . I have some knowledge of HttpSession - I have used it in some of my sample projects.
9 Answers
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JavaScript Nested function
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Functions are another type of variable in JavaScript (with some nuances of course). Creating a function within another function changes the scope of the function in the same way it would change the scope of a variable. This is especially important for use with closures to reduce ...
Tab space instead of multiple non-breaking spaces (“nbsp”)?
Is it possible to insert a tab character in HTML instead of having to type &nbsp; four times?
35 Answers
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Copy constructor for a class with unique_ptr
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Since the unique_ptr can not be shared, you need to either deep-copy its content or convert the unique_ptr to a shared_ptr.
class A
{
std::unique_ptr< int > up_;
public:
A( int i ) : up_( new int( i ) ) {}
A( const A& a ) : up_( new int( *a.up_ ) ) {}
};
i...
What's the point of the X-Requested-With header?
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A good reason is for security - this can prevent CSRF attacks because this header cannot be added to the AJAX request cross domain without the consent of the server via CORS.
Only the following headers are allowed cross domain:
Accept
Accept...