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Most efficient way to remove special characters from string

...ogram() { _lookup = new bool[65536]; for (char c = '0'; c <= '9'; c++) _lookup[c] = true; for (char c = 'A'; c <= 'Z'; c++) _lookup[c] = true; for (char c = 'a'; c <= 'z'; c++) _lookup[c] = true; _lookup['.'] = true; _lookup['_'] = true; } public static string RemoveSpeci...
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Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4

... anything can happen, and discussing why does it happen under the rules of C++ doesn't make sense. C++11 draft N3337: §5.4:1 If during the evaluation of an expression, the result is not mathematically defined or not in the range of representable values for its type, the behavior is undefin...
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What is string_view?

string_view was a proposed feature within the C++ Library Fundamentals TS( N3921 ) added to C++17 1 Answer ...
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App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网

...蓝牙,也称为蓝牙LE 或简称 BLE,是一种类似于经典蓝牙新通信协议,不同之处在于它旨在消耗更少功耗和成本,同时保持同等功能。 因此,低功耗蓝牙是与耗电资源有限物联网设备进行通信首选。BluetoothLE 扩展需要...
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创业者只需要一种素质:成为某个领域意见领袖 - 资讯 - 清泛网 - 专注C/C...

创业者只需要一种素质:成为某个领域意见领袖作为一个普通创业者,即使你有钱,只要你产品一经推出,100%是有缺点,只有经过用户不断体验和磨砺,最终才能成为有口碑爆款。 关于创业者需要具备哪些素质,...
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Socket send函数和recv函数详解以及利用select()函数来进行指定时间阻塞 ...

...end函数和recv函数详解以及利用select()函数来进行指定时间阻塞int send( SOCKET s, const char FAR *buf, int len, int flags ); 不论是客户还是服务器应用程序都用send函数来向TCP连接...int send( SOCKET s, const char FAR *buf, int len, int flags ); 不论是...
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【AI2+AI】人工智能舞姿识别App - 创客硬件开发 - 清泛IT社区,为创新赋能!

... Power提供教程地址: Awesome Dancing with AI Tutorial我们在YR Media朋友发表了一个有趣关于人工智能互动故事,题为“你能教人工智能跳舞吗?”这引起了我们思考。有没有一种算法来描述、识别或测量一种美妙舞蹈?舞蹈动...
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数据存储组件 · App Inventor 2 中文网

...数据文件 文件管理器 FileTools 拓展:提供额外更强大文件相关操作 电子表格 微数据库 网络微数据库 云数据库 云数据库是一个不可见组件,允许您将数据存储在连接到互联网...
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What is The Rule of Three?

... Introduction C++ treats variables of user-defined types with value semantics. This means that objects are implicitly copied in various contexts, and we should understand what "copying an object" actually means. Let us consider a simple ex...
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PHP大潮将至 PHP近年发展分析 - 创意 - 清泛网 - 专注C/C++及内核技术

PHP大潮将至 PHP近年发展分析作者通过自己对PHP近年发展分析,认为PHP凭借它简单、开发快速和扩展性强,在企业级应用上会有大发展前景。您觉得呢?说起PHP近几年发展,可以说是突飞猛进。EDC在2006年统计信息表明P...