大约有 40,000 项符合查询结果(耗时:0.0587秒) [XML]
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...
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...
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...
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 [ ] ...
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...
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:...
Why was the arguments.callee.caller property deprecated in JavaScript?
...|
edited May 1 '14 at 19:10
Pacerier
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answe...
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...
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...
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);
// => '2015-01-26T06:40:36.181'
The slice(0, -1) gets rid of the trailing Z which represents Zulu timezone a...
