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A fast method to round a double to a 32-bit int explained
...ll common, using type punning to get an integer out of a double was a huge win (see the benchmarks here, copied from a comment to the OP.) Your version is, of course, simpler. But it doesn't solve the problem of getting that result into an integer variable without the slow cast. (There's also nothin...
What are the downsides to using Dependency Injection? [closed]
...oing to increase complexity. It's all about balance, which begins with knowing the upsides and downsides. When people say, 'there are no downsides,' it's a sure indicator that they haven't fully understood the thing yet.
– Don Branson
Mar 9 '10 at 18:37
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Does Java 8 provide a good way to repeat a value or function?
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@jwenting It really depends - typically with GUI stuff (Swing or JavaFX), that removes a lot of boiler plate due to anonymous classes.
– assylias
Aug 30 '13 at 12:12
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Calling C++ class methods via a function pointer
...myfunction (arg);.
This kind of thing is fairly common when using the old Win32 APIs, which were originally designed for C rather than C++. Of course in that case, the parameter is normally LPARAM or similar rather than a pointer, and some casting is needed.
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How to echo with different colors in the Windows command line
...know that the color bf command sets the colors of the whole command line window but I wanted to to print one single line in a different color.
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NSObject +load and +initialize - What do they do?
...ories define the same method on the same class, one of the methods will “win” and be used, and the other method will never be called.
The initialize Method
The runtime calls the initialize method on a class object just before sending the first message (other than load or initialize) to the cla...
How to start two threads at “exactly” the same time
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@Santa - The Win32 API for example offers different primitives. One useful type is the manual reset event returned when you call CreateEvent. msdn.microsoft.com/en-us/library/ms686364%28VS.85%29.aspx
– ChaosPandion
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Retrieving the last record in each group - MySQL
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MySQL 8.0 now supports windowing functions, like almost all popular SQL implementations. With this standard syntax, we can write greatest-n-per-group queries:
WITH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id...
不同品牌的防火墙组成高可靠性集群 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ar.gz
[root@RS1 mnt]# tar xvf zebra-0.95a.tar
会在当前目录下自动生成一个zebra-0.95a子目录，进入zebra-0.95a目录后执行以下命令安装
[root@RS1 zebra-0.95a]# ./configure
编译出错
接下来是配置本地YUM 然后安装GCC，aclocal，autoconf，automake...
Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Line在国内的轮询策略
3、台湾（不使用GCM）：
从IBG同事win和guang提供的测试数据中看到，台湾使用的策略跟国内的轮询策略类似。
2.3 微信
微信没有使用GCM，自己维护TCP长连接，使用固定心跳。
2.4心跳典型值
What...