Why are callback functions called that? [closed] - objective-c

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Closed 10 years ago.
The reason for the name 'callback' eludes me. What does that term mean?

Because it provides a mechanism for a library to call back into your code.

Callbacks are called that because when you give something a callback, you enable it to "call back" into your code at a later time.

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CGAL::assign function [closed]

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Closed 9 years ago.
everyone. I am new to CGAL library. Here I am reading a CGAL demo. The code uses CGAL::assign function quite often, but I cann't find any reference to it. Anyone can point it out where I can see the how it is implemented? Thanks in advance!
CGAL::assign function
The doc is available here
http://doc.cgal.org/4.2/CGAL.CGAL.STL-Extensions-for-CGAL/html/classCGAL_1_1Object.html

Obj-C, trying to set accessability (including label) for the UIDatePicker? [closed]

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Closed 10 years ago.
I haven't got a clue where to start and how far I can go.
I would like to add labels for individual values in the the date picker.
But I'm not sure if this is possible and how to do it ?
I haven't got a clue where to start
Always start with the documentation.

What Amazon REST API do I use to get book information? [closed]

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Closed 9 years ago.
What Amazon REST API do I use to get book information? I will be using PHP.
If you know the book's ID, use ItemLookup. If you don't know it, use ItemSearch.

advertising a public wcf service [closed]

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Closed 11 years ago.
-hi all,
this question maybe downgrade my reputation... but I need some information to how advertise for my free wcf service-
Hope some readers of this question is italian for language reason!
Some one can help me?
-thank you all for your time
http://www.webservicelist.com/

Objective-c and garbage collection [closed]

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Closed 11 years ago.
If I code an objective-c program can I rely on the system to garbage collect efficiently?
To Bavarious's point, it depends on what your expectation of efficiency is. Putting that aside, note that garbage collection is only available on OS X, not iOS.