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Why are Objective-C delegates usually given the property assign instead of retain?

I'm surfing through the wonderful blog maintained by Scott Stevenson, and I'm trying to understand a fundamental Objective-C concept of assigning delegates the 'assign' property vs 'retain'. Note, the both are the same in a garbage collected environment. I'm mostly concerned with a non-GC based envi...
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How to join absolute and relative urls?

I have two urls: 6 Answers 6 ...
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What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN and FULL JOIN? [duplicate]

What's the difference between INNER JOIN , LEFT JOIN , RIGHT JOIN and FULL JOIN in MySQL ? 3 Answers ...
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Covariance and contravariance real world example

I'm having a little trouble understanding how I would use covariance and contravariance in the real world. 9 Answers ...
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How to see the changes between two commits without commits in-between?

How do you make git diff only show the difference between two commits, excluding the other commits in-between? 12 Answers...
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Find value in an array

In Ruby, how can I find a value in an array? 10 Answers 10 ...
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Select statement to find duplicates on certain fields

Can you help me with SQL statements to find duplicates on multiple fields? 7 Answers 7...
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What's the best way to iterate over two or more containers simultaneously

C++11 provides multiple ways to iterate over containers. For example: 10 Answers 10 ...
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How do I Moq a method that has an optional argument in its signature without explicitly specifying i

Given the following interface: 3 Answers 3 ...
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What is PostgreSQL explain telling me exactly?

MySQL's explain output is pretty straightforward. PostgreSQL's is a little more complicated. I haven't been able to find a good resource that explains it either. ...