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C++STL容器使用经验总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...是为了避免不必要的拷贝。使拷贝动作高效并且防止剥离问题发生的一个简单办法是使容器包含指针而不是对象。
第4条：调用empty而不是检查size()是否为0。
理由很简单：empty对所有的标准容器都是常数时间操作，而对...
How to get random value out of an array?
...ce PHP 5.2.10, see 48224), so your picked items will always be in original order. Use shuffle() afterwards if needed.
Documentation: array_rand(), shuffle()
edit: The Laravel function has noticeably grown since then, see Laravel 5.4's Arr::random(). Here is something more elaborate, derived fro...
PHP variables in anonymous functions
...tion() use(&$variable) {
$variable = "something";
});
Note that in order for you to be able to modify $variable and retrieve the modified value outside of the scope of the anonymous function, it must be referenced in the closure using &.
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configure: error: Unable to find gd.h anywhere under /usr/local/gd - ...
configure: error: Unable to find gd.h anywhere under /usr/local/gd安装php时出现configure: error: Unable to find gd.h anywhere under，错误解决在进行PHP开发环境源码安装时，在安装PHP-5.2.6是出...安装php时出现configure: error: Unable to find gd.h anywhere under，错误...
Detect Android phone via Javascript / jQuery
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Are there any JavaScript static analysis tools? [closed]
...s answer) I have have also gotten a lot of benefit from running JSHint and PHP CodeSniffer. As of 2012, all four tools are free open-source and have a large and active developer community behind them. They're each a bit different (and I think, complementary) in the kinds of checks they perform:
JS...
大数据时代的数据化运营 - 资讯 - 清泛网 - 专注C/C++及内核技术
...下，我们在运营中看到可以获得有效数据的原始数据不是问题，去除无效和虚假的数据才是关键。
相信做发行的同行都知道，在实践中，会遇到通过某些渠道或者是CPS，或者是广告渠道，他们一定会有大量的虚假的数据在里面...
App Inventor 2 中文网原创内容 · App Inventor 2 中文网
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内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...II 上进行汇编语言编程的时代，那时内存管理还不是个大问题。您实际上在运行整个系统。系统有 多少内存，您就有多少内存。您甚至不必费心思去弄明白它有多少内存，因为每一台机器的内存数量都相同。 所以，如果内存需...
Include constant in string without concatenating
Is there a way in PHP to include a constant in a string without concatenating?
12 Answers
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