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Sending a message to nil in Objective-C
As a Java developer who is reading Apple's Objective-C 2.0 documentation: I wonder what " sending a message to nil " means - let alone how it is actually useful. Taking an excerpt from the documentation:
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Why do objects of the same class have access to each other's private data?
Why do objects of the same class have access to each other's private data?
7 Answers
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Why can't I use the 'await' operator within the body of a lock statement?
...s a testament to that fact. Rather, it is an incredibly bad idea and so we don't allow it, so as to protect you from making this mistake.
call to Monitor.Exit within ExitDisposable.Dispose seems to block indefinitely (most of the time) causing deadlocks as other threads attempt to acquire the lo...
How do I include a newline character in a string in Delphi?
...at spans multiple lines to assign to a Label Caption property. How is this done in Delphi?
11 Answers
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How do I insert NULL values using PDO?
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I'm just learning PDO, but I think you need to use bindValue, not bindParam
bindParam takes a variable, to reference, and doesn't pull in a value at the time of calling bindParam. I found this in a comment on the php docs:
bindValue(':param',...
Grunt watch error - Waiting…Fatal error: watch ENOSPC
Why do I get the Waiting...Fatal error: watch ENOSPC when I run the watch task ?
How do I solve this issue?
7 Answers
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How can I iterate over an enum?
...meant to be skipped by the iteration. Utilizing this "fake" Last enum, you don't have to update your terminating condition in the for loop to the last "real" enum each time you want to add a new enum.
If you want to add more enums later, just add them before Last. The loop in this example will still...
Why the switch statement cannot be applied on strings?
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The reason why has to do with the type system. C/C++ doesn't really support strings as a type. It does support the idea of a constant char array but it doesn't really fully understand the notion of a string.
In order to generate the code for ...
What does a \ (backslash) do in PHP (5.3+)?
What does a \ do in PHP?
4 Answers
4
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jQuery .live() vs .on() method for adding a click event after loading dynamic html
...oaded dynamically, then you set the event handler on a parent object (that does not get loaded dynamically) and give it a selector that matches your dynamic object like this:
$('#parent').on("click", "#child", function() {});
The event handler will be attached to the #parent object and anytime a ...