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Why are Objective-C delegates usually given the property assign instead of retain?
...
The reason that you avoid retaining delegates is that you need to avoid a retain cycle:
A creates B
A sets itself as B's delegate
…
A is released by its owner
If B had retained A, A wouldn't be released, as B owns A, thus A's dealloc would neve...
Clojure differences between Ref, Var, Agent, Atom, with examples
...duce a short snip-it of the motivations for each:
start by watching this video on the notion of Identity and/or studying here.
Refs are for Coordinated Synchronous access to "Many Identities".
Atoms are for Uncoordinated synchronous access to a single Identity.
Agents are for Uncoordinated asynch...
How to throw a C++ exception
...int a, int b ) {
if ( a < 0 || b < 0 ) {
throw std::invalid_argument( "received negative value" );
}
}
The Standard Library comes with a nice collection of built-in exception objects you can throw. Keep in mind that you should always throw by value and catch by reference:
t...
Reordering of commits
...then run git rebase --continue to move on. These instructions are also provided by the error message printed when the conflict occurs.
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addEventListener vs onclick
... of events to any single element. The only practical limitation is client-side memory and other performance concerns, which are different for each browser.
The examples above represent using an anonymous function[doc]. You can also add an event listener using a function reference[doc] or a closure[...
Passing current scope to an AngularJS Service
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@Caio Cunha Could you expand on why it's not a good idea to pass a scope? I'm having exactly this issue, I want to add some stuff to $scope via a call to a service using an async executeSql() function. Looking into 3 options (1) use a callback on the async function, then call ...
All falsey values in JavaScript
...= false.
This is one of the reasons why many developers and many style guides (e.g. standardjs) prefer === and almost never use ==.
Truthy values that actually == false
"Truthy" simply means that JavaScript's internal ToBoolean function returns true. A quirk of Javascript to be aware of (and ...
When to use nested classes and classes nested in modules?
...y a difference in name.
As for your second observation, classes nested inside of modules are generally used to namespace the classes. For instance:
module ActiveRecord
class Base
end
end
differs from
module ActionMailer
class Base
end
end
Although this is not the only use of classes n...
How and why do I set up a C# build machine? [closed]
...ndation Server
fxcop
stylecop
compiler warnings
code tasks
Also, god forbid you are using visual source safe, it supports that as well. I'd recommend you take a look at Redsolo's article on building .net projects using Hudson
Your questions
Q: What kind of tools/licenses will I need? Right now,...
Can I have multiple :before pseudo-elements for the same element?
...can specify exactly what the browser should do in those cases. I can't provide a complete example including the content property here, since it's not clear for instance whether the symbol or the text should come first. But the selector you need for this combined rule is either .circle.now:before or ...