大约有 6,000 项符合查询结果（耗时：0.0174秒） [XML]
is_null($x) vs $x === null in PHP [duplicate]
... Program execution time tends to follow a Pareto distribution i.e. ~20% of the codebase is responsible for ~80% of the runtime (when its not 10/90 or even 1/99). So, ya, this kind of microoptimization won't usually buy you much.
– Marcel Hernandez
May 31...
Integer division with remainder in JavaScript?
...
Conclusion: Use (a/b>>0) (or (~~(a/b)) or (a/b|0)) to achieve about 20% gain in efficiency. Also keep in mind that they are all inconsistent with Math.floor, when a/b<0 && a%b!=0.
share
|
...
How to set up fixed width for ?
... <th style="width: 30%">Col 1</th>
<th style="width: 20%">Col 2</th>
<th style="width: 10%">Col 3</th>
<th style="width: 30%">Col 4</th>
<th style="width: 10%">Col 5</th>
</tr>
</thead>
<tbody...
How do I alias commands in git?
...
I think the most useful gitconfig is like this,we always use the 20% function in git,you can try the "g ll",it is amazing,the details:
[user]
name = my name
email = me@example.com
[core]
editor = vi
[alias]
aa = add --all
bv = branch -vv
ba = branch -ra
bd =...
Getting a slice of keys from a map
...hen generating the array of keys ten times with each method), it was about 20% faster to assign members of the array directly than to use append.
Although setting the capacity eliminates reallocations, append still has to do extra work to check if you've reached capacity on each append.
...
How can I check if multiplying two numbers in Java will cause an overflow?
...
I checked it. For small values it is 20% faster than BigInteger and for values near MAX it is nearly the same (5% faster). Yossarian's code is the fastest (95% & 75% faster than BigInteger).
– Thomas Jung
Nov 1 '09 at 1...
.a: error adding symbols: File format not recognized 原因 - 操作系统(...
...t recognized。也可能出现编译能通过，但ldd报链接失败不能运行。原因是：在低版本Linux GCC上编译工程 Linux编译链接时报错：xxx.a: error adding symbols: File format not recognized。也可能出现编译能通过，但ldd报链接失败不能运行。
原因...
CDHtmlDialog的基本使用（C++调用JS函数的实现） - C/C++ - 清泛网 - 专注IT技能提升
...：
一、在主对话框上添加一个C++按钮，步骤如下：
运行效果如下：
二、为C++按钮添加调用Js的代码：
JSCppInteractive.htm中添加一个js函数供C++调用，代码如下：
<script type="text/javascript">
function CppCallJsFunc() {
alert("JS a...
std::find，std::find_if使用小结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
printf("find:%s\n", it->c_str());
else
printf("not found.\n");
}
运行结果：
那么，如果容器里的元素是一个类/结构体呢？
来个稍复杂点的例子，其他的可以类推，实现功能如下：
产品、账号多对多的关系，通过产品找到对应的...
vc/mfc *通配符 批量删除文件 - C/C++ - 清泛网 - 专注C/C++及内核技术
vc/mfc *通配符 批量删除文件直接上代码，可直接运行亲测有效，使用SHFileOperation函数：#include "stdafx.h"#include <windows.h>int _tmain(int argc, _TCHAR*...直接上代码，可直接运行亲测有效，使用SHFileOperation函数：
#include "stdafx.h"
#include <win...