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Understanding reference counting with Cocoa and Objective-C

I'm just beginning to have a look at Objective-C and Cocoa with a view to playing with the iPhone SDK. I'm reasonably comfortable with C's malloc and free concept, but Cocoa's references counting scheme has me rather confused. I'm told it's very elegant once you understand it, but I'm just not o...
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MFC CListCtrl使用方法详解 - C/C++ - 清泛网 - 专注C/C++及内核技术

MFC CListCtrl使用方法详解以下未经说明,listctrl默认view 风格为report相关类及处理函数MFC:CListCtrl类SDK:以 ListView_开头的一些宏。如 ListView_InsertCol 以下未经说明,listctrl默认view 风格为report 相关类及处理函数 MFC:CListCtrl类 SD...
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Simple way to calculate median with MySQL

What's the simplest (and hopefully not too slow) way to calculate the median with MySQL? I've used AVG(x) for finding the mean, but I'm having a hard time finding a simple way of calculating the median. For now, I'm returning all the rows to PHP, doing a sort, and then picking the middle row, but ...
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Convert float to double without losing precision

I have a primitive float and I need as a primitive double. Simply casting the float to double gives me weird extra precision. For example: ...
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Does free(ptr) where ptr is NULL corrupt memory?

Theoretically I can say that 10 Answers 10 ...
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The EXECUTE permission was denied on the object 'xxxxxxx', database 'zzzzzzz', schema 'dbo'

I'm having problems executing a function. 14 Answers 14 ...
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Mockito: InvalidUseOfMatchersException

I have a command line tool that performs a DNS check. If the DNS check succeeds, the command proceeds with further tasks. I am trying to write unit tests for this using Mockito. Here's my code: ...
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Applying a git post-commit hook to all current and future repos

I've written a Git post-commit hook and it works correctly. However, I want to add this hook to apply to all current (and future) git repositories I am working on. I tried adding the hook to my ~/.git/hooks/ instead of in the hooks directory in the project directory, however, this did not seem t...
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JMS and AMQP - RabbitMQ

I am trying to understand what JMS and how it is connected to AMQP terminology. I know JMS is an API and AMQP is a protocol. ...
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Multiple RunWith Statements in jUnit

I write unit test and want to use JUnitParamsRunner and MockitoJUnitRunner for one test class. 8 Answers ...