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C++11 tuple 这一篇就够了 - C/C++ - 清泛网 - 专注C/C++及内核技术

...e> #include <functional> int main() { auto t1 = std::make_tuple(10, "Test", 3.14); std::cout << "The value of t1 is " << "(" << std::get<0>(t1) << ", " << std::get<1>(t1) << ", " << std::get<2>(t1) << ")\n"; int n = 1; auto t2 = std::make_tupl...
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AfxIsValidAddress 测试内存地址 - C/C++ - 清泛网 - 专注C/C++及内核技术

...y block is contained entirely within the program's memory space; otherwise 0. 在调试版,如果指定的内存被完全包含在程序的内存空间,返回值不为0,否则为0. In non-debug builds, nonzero if lp is not NULL; otherwise 0. 在调试构建,如果lp不为空,返回值...
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bat 写注册表详解 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...MULTI_SZ 数据字符串中用作分隔符的字符。如果忽略则将 "\0" 用作分隔符 /d 要分配给添加的注册表 ValueName 的数据 /f 不用提示就强行改写现有注册表项 例如: REG ADD \\ABC\HKLM\Software\MyCo 添加远程机器 ABC 上的一个注册表项 HKLM...
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php:获取数组第一个值 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...HP 5.4版本后可以使用[ ]来取数据指定位置的元素,索引从0开始,即$arr[0]取数组第一个值。不过为了兼容性,建议还是采取reset(),current(),next()等函数来取数组中的值,reset($arr)后current($arr)取第一个值。自PHP 5.4版本后可以使用 [ ] ...
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还原MongoDB中Decimal类型数据 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...转换为Double类型存储。 但是,取出来的数据(原数据为0.12345)可能是类似0.1234499999999的形式,ToString("f4")转化string值为0.1234,正确值应为0.1235。 解决方法: 先还原Double类型后值为0.12345,再做四舍五入。 private static string D...
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App Inventor 2 天气预报App开发 - 第三方API接入的通用方法 · App Inventor 2 中文网

...l -L -X GET --compressed 'https://api.qweather.com/v7/weather/7d?location=101010100&key=YOUR_KEY' 第三方API的调用 使用”Web客户端“组件调用第三方API,代码如下: JSON结果的解析 请求成功返回JSON示例 { "code": "200", "updateTime": "2021-11-15T16:35+08:...
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Why was the arguments.callee.caller property deprecated in JavaScript?

...| edited May 1 '14 at 19:10 Pacerier 71.8k7979 gold badges314314 silver badges582582 bronze badges answe...
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Difference between Observer, Pub/Sub, and Data Binding

... +50 Here's my take on the three: Data Binding Essentially, at the core this just means "the value of property X on object Y is semantica...
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What's the best way of structuring data on firebase?

...No biggie if none of those things number in thousands. But a big deal for 10k users with upwards of 5k messages each. So now the optimal strategy for a hierarchical, real-time structure becomes more obvious: /user_meta/uid/email /messages/uid/... /widgets/uid/... An additional tool which is extr...
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javascript toISOString() ignores timezone offset [duplicate]

...llowing works as well: var tzoffset = (new Date()).getTimezoneOffset() * 60000; //offset in milliseconds var localISOTime = (new Date(Date.now() - tzoffset)).toISOString().slice(0, -1); // =&gt; '2015-01-26T06:40:36.181' The slice(0, -1) gets rid of the trailing Z which represents Zulu timezone a...