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如何高效的学习掌握新技术 - 杂谈 - 清泛网 - 专注C/C++及内核技术

...当于又打开了一扇新的大门,可以从更宽广的角度来看待问题。 从心理学的角度来说,我们对于外部世界的认识可分为三个区域:舒适区,学习区,和恐慌区。我们所熟悉的技术领域就是舒适区,而新技术是处于学习区或恐慌...
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How to get a one-dimensional scalar array as a doctrine dql query result?

... PHP < 5.5 You can use array_map, and since you only have on item per array, you can elegantly use 'current' as callback, instead of writing a closure. $result = $em->createQuery("SELECT a.id FROM Auction a")->getS...
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C++模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术

...至于这里怎么都把T2搞没了变成只依赖一个模板参数T了的问题,大家别着急,我来告诉你个本质的东西,把我这么三点就可以了:1.模板参数个数一致;2.只要template <...>里面有东西不是<>,比如typename T,那么特化时就得用到T;3....
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如何建立一套适合自己的高胜算交易系统 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...人若想在效率市场持续稳定的赢利,必须成功的解决两大问题:1、如何在高度随机的价格波动中寻找非随机的部分;2、如何有效的控制自身的心理弱点,使之不致影响自己的理性决策。很多投资家的实践都证明,交易系统在上...
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How can I check if the current date/time is past a set date/time?

... Since PHP &gt;= 5.2.2 you can use the DateTime class as such: if (new DateTime() &gt; new DateTime("2010-05-15 16:00:00")) { # current time is greater than 2010-05-15 16:00:00 # in other words, 2010-05-15 16:00:00 has pass...
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[精华]VC++对话框程序打印及打印预览的实现 - C/C++ - 清泛网 - 专注C/C++及内核技术

...类的实现。打印及打印预览是编写应用程序经常要解决的问题,为了理解VC++对话框程序的打印及打印预览实现,要先掌握基于文档/视图的应用程序打印及打印预览的基本原理。所以分为两部分介绍。 一、基于文档/视图的应用程...
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How do I read from parameters.yml in a controller in symfony2?

...er: '%api_user%' App\: resource: .. 2. Any Controller &lt;?php declare(strict_types=1); final class ApiController extends SymfonyController { /** * @var string */ private $apiPass; /** * @var string */ private $apiUser; public function __co...
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快速理解 高频对冲套利自动交易(程式化交易) - 更多技术 - 清泛网 - 专注...

...的都是浮亏的。直到浮亏变盈。) 你的理解大体上没有问题。与以往单向投机的区别是:我并非在某个价位上有多笔持仓浮亏,而是,每一个持仓浮亏单,均是不同价格,且由于是对冲套利持仓,不担心绝对价格的暴涨暴跌,...
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Creating .pem file for APNS?

...ed the above steps and now its working.I have kept the certificate and the php script on my local web server (Xampp). I am able to get the device token , and i am using it in the php script. The php script is able to connect and send payload data. But still then i am not able to get the PUSH Notifi...
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Sending a JSON to server and retrieving a JSON in return, without JQuery

... } }; xhr.send(); Handling data in JSON format on the server-side using PHP &lt;?php // Handling data in JSON format on the server-side using PHP // header("Content-Type: application/json"); // build a PHP variable from JSON sent using POST method $v = json_decode(stripslashes(file_get_contents(...