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App Inventor 2 计时器(Clock)详细用法示例 · App Inventor 2 中文网

...是自动启用的,也可程序控制它的属性“启用计时”和“启用计时”。 怎么确定计时器执行没? 定一数字全局变量,计时方法里面自增,然后输出显示在一标签上,查看数字结果。 怎么获取手...
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App Inventor 2 任意组件代码块 · App Inventor 2 中文网

...”;如果没有这事件代码块,则返回“真”。 光是“点击”这事件,展开一下诸如“获得焦点”、“慢点击”等其他事件,也是一样的逻辑,表示相应的事件是否已经定义过了。 ...
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【天气API】对接国内免费好用的天气API - App应用开发 - 清泛IT社区,为创新赋能!

...知,和风天气API更新了认证方式,由ApiKey换成了WebToken,是一般的复杂。因此需要更换一款天气API。 此帖子记录API使用及开发过程。目前已知的有: 1. 高德地图天气 API 免费版可用资源 30万次/日,200次/秒并发 实时天气预...
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Random float number generation

How do I generate random floats in C++? 14 Answers 14 ...
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How to detect total available/free disk space on the iPhone/iPad device?

...using NSUInteger instead of stuff like uint64_t ? We're writing Obj-C, not C++ or C. NSUInteger will give you an unsigned 64 bit integer now, but if things happen to change I imagine that Apple will update that Macro (let's say 128 bits at some point, becomes real) – Goles ...
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Does Java have buffer overflows?

...s: If you call native code via JNI In the JVM itself (usually written in C++) The interpreter or JIT compiler does not work correctly (Java bytecode mandated bounds checks) share | improve this a...
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C++ Lock-free Hazard Pointer(冒险指针) - C/C++ - 清泛网 - 专注C/C++及内核技术

C++ Lock-free Hazard Pointer(冒险指针)hazard_pointer1 Safe Reclamation MethodsFolly 的 Hazard Pointer 实现中有一段注释,详细描述了 C++ 里几种主流的安全内存回收方法,列表如下:优点缺点场景Locking易用读高开销 1. Safe Reclamation Methods Fo...
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Why is processing a sorted array slower than an unsorted array?

... Good reason why everything you learn in C/C++ doesn't apply verbatim to a language like C#! – user541686 Dec 24 '12 at 17:48 38 ...
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Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术

Linux C/C++进程单实例互斥代码分享linux-process-singleton分享一段LinuxC C++程序只能启动一份实例的实现代码,原理是通过文件锁互斥实现,最重要的是考虑了同用户运行同一程序互斥的场景,已经过充分的测试,可直接用于实际项...
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Undefined reference to static class member

... The problem comes because of an interesting clash of new C++ features and what you're trying to do. First, let's take a look at the push_back signature: void push_back(const T&) It's expecting a reference to an object of type T. Under the old system of initialization, such...