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App Inventor 2 字典代码块 · App Inventor 2 中文网

...路径的值 获取键路径的值 块是 获取键的值 块的更高级版本,它不是获取特定键的值,而是逐层遍历路径,逐层深入数据结构获取值。 获取键的值 块等同于获取键路径的值 块路径长度为 1。 例如,以下两个块将返回 "Tim the B...
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Expanding tuples into arguments

...ted May 27 at 13:31 Nicolas Gervais 13.3k77 gold badges3434 silver badges5656 bronze badges answered Jan 3 '10 at 2:24 ...
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Can you control how an SVG's stroke-width is drawn?

...the inset and offset of a shape. It's not perfect (need to keep checking against latest browser versions) but it does accurately provide a shapes outer width for now. – Steve Sep 2 '11 at 10:02 ...
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原子vector的一种实现源码(atomic-vector) - C/C++ - 清泛网 - 专注C/C++及内核技术

...接 源码依赖Facebook的folly库,稍加适配改成了独立运行的版本,代码比较简单,实现分配好空间,然后对元素进行原子交换,扩容采用链表的形式,代码可直接运行。 测试代码: HPHP::AtomicVector<float> v_atom(2, 0.f); void atom_vecto...
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通过FastCGI Cache实现服务降级 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...可能会影响性能,此时没有特别好的解决办法,如果Nginx版本够的话,可以考虑激活fastcgi_cache_revalidate,如此一来,PHP-FPM一旦判断系统处于异常情况,那么可以直接返回304实现缓存续期。 … 通过FastCGI Cache实现服务降级,这是...
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Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)

...nished my check on INNODB from 10 checks I can tell that it's 26(2query) against 9.2(1 query) SELECT SQL_CALC_FOUND_ROWS tblA.*, tblB.id AS 'b_id', tblB.city AS 'b_city', tblC.id AS 'c_id', tblC.type AS 'c_type', tblD.id AS 'd_id', tblD.extype AS 'd_extype',...
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苹果全球开发者大会:无硬件 iOS 9等三大系统更新 - 资讯 - 清泛网 - 专注C...

...藏起来,仅收听声音。 iOS 9今天开始向开发者提供测试版本下载,公开测试版7月推出,预计9月底正式版将与iPhone 6s同时推出。iPhone 4s与iPad 2以及以上的设备都可以升级至iOS 9,苹果表示iPad Air 2完整支持3项分屏功能,而iPad Air、...
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List Git aliases

...to yield lines starting with alias in case some configurations somehow contains keyword alias: git config --list | grep -E '^alias' – MasterMind Feb 2 '18 at 10:19 add a comme...
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可重入函数、不可重入函数及线程安全 - C/C++ - 清泛网 - 专注C/C++及内核技术

...分配表 在unix里面通常都有加上_r后缀的同名可重入函数版本。如果实在没有,不妨在可预见的发生错误的地方尝试加上保护锁同步机制等等。 二,函数线程安全 看看APUE上,描述的非线程安全函数 asctime ecvt ...
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How can I get the external SD card path for Android 4.0+?

...unt") .redirectErrorStream(true).start(); process.waitFor(); final InputStream is = process.getInputStream(); final byte[] buffer = new byte[1024]; while (is.read(buffer) != -1) { s = s + new String(buffer); } is.close(); ...