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What does auto do in margin:0 auto?
...
From the CSS specification on Calculating widths and margins for Block-level, non-replaced elements in normal flow:
If both 'margin-left' and 'margin-right' are 'auto', their used values are equal. This horizontally centers the element with respect to the edges of the containing block....
jQuery using append with effects
...tatusupdate").submit( function () {
$.post(
'ajax.php',
$(this).serialize(),
function(data){
$("#box").prepend($(data).fadeIn('slow'));
$("#status").val('');
}
);
even...
What is the difference between atomic / volatile / synchronized?
... //thread-safe, SRSLy?
}
No two threads can enter the same synchronized block with the same lock. In this case (and similarly in your code) the lock object changes upon every execution, so synchronized effectively has no effect.
Even if you have used a final variable (or this) for synchronizatio...
What's the difference between require and require-dev? [duplicate]
...roduction version of your project.
Typically, these are packages such as phpunit/phpunit that you would only use during development.
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What is an SSTable?
... in a specified key range. Internally, each SSTable contains a sequence of blocks (typically each block is 64KB in size, but this is configurable). A block index (stored at the end of the SSTable) is used to locate blocks; the index is loaded into memory when the SSTable is opened. A lookup can be p...
When to use Task.Delay, when to use Thread.Sleep?
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Use Thread.Sleep when you want to block the current thread.
Use Task.Delay when you want a logical delay without blocking the current thread.
Efficiency should not be a paramount concern with these methods. Their primary real-world use is as retry timers fo...
NSIS学习笔记（持续更新） - C/C++ - 清泛网 - 专注C/C++及内核技术
...NSIS进阶教程－－制作仿酷狗安装包
http://home.xtzj.com/forum.php?mod=viewthread&tid=610259
[2]NSI脚本编辑器
http://az.eliang.com/aq_2013030724.html
[3]Writing a NSIS plugin
http://clseto.mysinablog.com/index.php?op=ViewArticle&articleId=1910084
http://blog.csdn.net/lee353086/...
dispatch_after - GCD in Swift?
...structure:
dispatch_after(when: dispatch_time_t, queue: dispatch_queue_t, block: dispatch_block_t?)
dispatch_time_t is a UInt64. The dispatch_queue_t is actually type aliased to an NSObject, but you should just use your familiar GCD methods to get queues. The block is a Swift closure. Specificall...
multiprocessing.Pool: When to use apply, apply_async or map?
...cept that the function call is performed in a separate process. Pool.apply blocks until the function is completed.
Pool.apply_async is also like Python's built-in apply, except that the call returns immediately instead of waiting for the result. An AsyncResult object is returned. You call its get()...
TransactionManagementError “You can't execute queries until the end of the 'atomic' block” while usi
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For me, I already had a transaction.atomic() block, but I got this error and I had no idea why. I took this answer's advice and put a nested atomic block inside of my atomic block around the trouble-area. After that, it gave a detailed error of the integrity error I hit...