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What does auto&& tell us?
...fact that it was originally either an lvalue or an rvalue, your code says: Now that I've got your object from either an lvalue or rvalue expression, I want to preserve whichever valueness it originally had so I can use it most efficiently - this might invalidate it. As in:
auto&& var = some...
string.charAt(x) or string[x]?
...
Bracket notation now works on all major browsers, except for IE7 and below.
// Bracket Notation
"Test String1"[6]
// charAt Implementation
"Test String1".charAt(6)
It used to be a bad idea to use brackets, for these reasons (Source):
...
Why is iterating through a large Django QuerySet consuming massive amounts of memory?
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Small improvements now possible since post. Paginator now has a page_range property to avoid boilerplate. If in search of minimal memory overhead, you can use object_list.iterator() which will not populate the queryset cache. prefetch_relat...
Installing in Homebrew errors
...g the practical and security ramifications. Any software in /usr/local may now be overwritten by anything running under your user, opening a security hole. It is entirely possible you will screw something else up (in addition to MySQL) by blindly running the first chown command, after which point it...
How to resolve the C:\fakepath?
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Some browsers have a security feature that prevents JavaScript from knowing your file's local full path. It makes sense - as a client, you don't want the server to know your local machine's filesystem. It would be nice if all browsers did this.
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How to declare global variables in Android?
... Android is to associate your state with the Application context.
As you know, each Activity is also a Context, which is information about its execution environment in the broadest sense. Your application also has a context, and Android guarantees that it will exist as a single instance across your...
Objective-C for Windows
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WinObjC? Windows Bridge for iOS (previously known as ‘Project Islandwood’).
Windows Bridge for iOS (also referred to as WinObjC) is a Microsoft open source project that provides an Objective-C development environment for Visual Studio/Windows. In addition, WinObjC...
Rails: update_attribute vs update_attributes
...nd(name.to_s + '=', value)
2616: save(false)
2617: end
and now refer update_attributes and look at its code you get
# File vendor/rails/activerecord/lib/active_record/base.rb, line 2621
2621: def update_attributes(attributes)
2622: self.attributes = attributes
26...
What are the new documentation commands available in Xcode 5? [closed]
...are.
- returns: The number squared.
*/
Notice how @param is now - parameter.
You can also now include bullets in your documentation:
/**
- square(5) = 25
- square(10) = 100
*/
share
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remove_if equivalent for std::map
...would work, but semantically, people often use for() for iterating over a known range, and while() for an unknown number of loops. Since the range is known in this case (from the beginning, to endIter), for() wouldn't be an unusual choice, and would probably be more common. But again, both would be ...