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Virtual functions and performance - C++
...e a very slight effect on performance, but it's unlikely to affect the overall performance of your application. Better places to look for performance improvements are in algorithms and I/O.
An excellent article that talks about virtual functions (and more) is Member Function Pointers and the Fastes...
How to identify CAAnimation within the animationDidStop delegate?
... where I had a series of overlapping CATransition / CAAnimation sequences, all of which I needed to perform custom operations when the animations stopped, but I only wanted one delegate handler for animationDidStop.
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How do you open an SDF file (SQL Server Compact Edition)? [closed]
... and query it with some UI. How can I do this? I have no Visual Studio installed on the machine and I would like to install as little software as possible.
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How to “git clone” including submodules?
...e available in version 2.8, and fetches up to 8 submodules at a time in parallel — see man git-clone.
With version 1.9 of Git up until version 2.12 (-j flag only available in version 2.8+):
git clone --recursive -j8 git://github.com/foo/bar.git
cd bar
With version 1.6.5 of Git and later, you c...
Should I store generated code in source control
...ave to do a commit every time you do a build for it to be any value.
Generally we leave generated code( idl, jaxb stuff, etc) outside source control where I work and it's never been a problem
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Why does a function with no parameters (compared to the actual function definition) compile?
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All the other answers are correct, but just for completion
A function is declared in the following manner:
return-type function-name(parameter-list,...) { body... }
return-type is the variable type that the funct...
How to remove newlines from beginning and end of a string?
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String.replaceAll("[\n\r]", "");
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Method has the same erasure as another method in type
...ode that still uses raw types.
Here's an illustration of why this was not allowed, drawn from the JLS. Suppose, before generics were introduced to Java, I wrote some code like this:
class CollectionConverter {
List toList(Collection c) {...}
}
You extend my class, like this:
class Overrider e...
What's the point of const pointers?
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"Help the compiler help you" is the mantra I normally chant for this.
– Flexo♦
Oct 11 '11 at 9:44
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Postfix日常维护队列管理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...删除。
例如id是0EAF3A9B 那么postsuper -d 0EAF3A9B
postsuper -d ALL 删除所有邮件
显示信件列表：postqueue -p
显示信件內容：postcat -q Queue_ID
刪除各別信件：postsuper -d Queue_ID
全部刪除：postsuper -d ALL
扣住信件：postsuper -h Queue_ID
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