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Why fragments, and when to use fragments instead of activities?
In Android API 11+, Google has released a new class called Fragment .
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Why use Abstract Base Classes in Python?
Because I am used to the old ways of duck typing in Python, I fail to understand the need for ABC (abstract base classes). The help is good on how to use them.
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Memoization in Haskell?
Any pointers on how to solve efficiently the following function in Haskell, for large numbers (n > 108)
8 Answers
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GetType() can lie?
Based on the following question asked a few days ago in SO: GetType() and polymorphism and reading Eric Lippert's answer, I started thinking if making GetType() not be virtual really ensured that an object could not lie about its Type .
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A non well formed numeric value encountered
I have a form that passes two dates (start and finish) to a PHP script that will add those to a DB. I am having problems validating this. I keep getting the following errors
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JMS Topic vs Queues
I was wondering what is the difference between a JMS Queue and JMS Topic.
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The $.param( ) inverse function in JavaScript / jQuery
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Separation of business logic and data access in django
I am writing a project in Django and I see that 80% of the code is in the file models.py . This code is confusing and, after a certain time, I cease to understand what is really happening.
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When is std::weak_ptr useful?
I started studying smart pointers of C++11 and I don't see any useful use of std::weak_ptr . Can someone tell me when std::weak_ptr is useful/necessary?
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How to delete an item in a list if it exists?
I am getting new_tag from a form text field with self.response.get("new_tag") and selected_tags from checkbox fields with
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