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receiver type *** for instance message is a forward declaration
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That basically means that you need to import the .h file containing the declaration of States.
However, there is a lot of other stuff wrong with your code.
You're -init'ing an object without +alloc'ing it. That won't work
You're declarin...
Fastest check if row exists in PostgreSQL
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Extension on this, you can name the returned column for easy reference. Eg select exists(select 1 from contact where id=12) AS "exists"
– Rowan
Sep 15 '13 at 23:16
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What is the best way to add options to a select from a JavaScript object with jQuery?
What is the best method for adding options to a <select> from a JavaScript object using jQuery?
36 Answers
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Is there any simple way to find out unused strings in Android project?
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On Android Studio:
Menu -> Analyze -> Run Inspection by Name -> Unused resources
Check File mask(s) checkbox and put strings.xml in the text field.
share
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Compiler Ambiguous invocation error - anonymous method and method group with Func or Action
I have a scenario where I want to use method group syntax rather than anonymous methods (or lambda syntax) for calling a function.
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How to insert a row in an HTML table body in JavaScript
...nto the tbody, get a reference to it and add it there.
var tableRef = document.getElementById('myTable').getElementsByTagName('tbody')[0];
// Insert a row in the table at the last row
var newRow = tableRef.insertRow();
// Insert a cell in the row at index 0
var newCell = newRow.insertCell(0);
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How do I capture SIGINT in Python?
...n I want to kill the script with a Ctrl + C signal, and I'd like to do some cleanup.
12 Answers
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How to return PDF to browser in MVC?
...rn a FileContentResult. The last line in your controller action would be something like:
return File("Chap0101.pdf", "application/pdf");
If you are generating this PDF dynamically, it may be better to use a MemoryStream, and create the document in memory instead of saving to file. The code would ...
How to write a bash script that takes optional input arguments?
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You could use the default-value syntax:
somecommand ${1:-foo}
The above will, as described in Bash Reference Manual - 3.5.3 Shell Parameter Expansion [emphasis mine]:
If parameter is unset or null, the expansion of word is substituted. Otherwise, the value of p...
Lisp in the real world
I have experimented with Lisp (actually Scheme) and found it to be a very beautiful language that I am interested in learning more about. However, it appears that Lisp is never used in serious projects, and I haven't seen it listed as a desired skill on any job posting. I am interested in hearing ...