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调用空智能指针对象的函数，Windows及Linux行为解析 - C/C++ - 清泛网 - 专...
...-O0以上优化版本访问空智能指针对象函数会发生崩溃。
问题起因：一个智能指针对象使用IsNull()判断是否为空后，执行函数，仅在Linux开优化（-O0以上）发生崩溃，代码如下：
#include <stdio.h>
#include <memory>
#include <assert.h>
c...
Unicode and UTF-8 - 综合 - 清泛IT论坛，有思想、有深度
...英文存储空间会Double！
为了解决这些现实生活中遇到的问题，UTF-8编码应运而生！
言归正传,对于UTF-8：
UTF-8是针对Unicode(UCS-2或UCS-4)的可变长度编码方式，是一种前缀码，它可用来编码Unicode中的任何一个字符。UTF-8编码和ASCII...
图片轮播拓展 - ColinTreeSlideShow - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...一个空的 水平滚动布局，将宽高设置好
（目前组件有个问题，在加入图片之后调整这个布局，图片不会跟随改变大小）如图（背景颜色可以先设置好）：
在添加列表项之前先初始化一下，调用传入一个参数：调用ColinTreeSlideSh...
HAXM 安装/启动失败？ - App Inventor 2 离线版 - 清泛IT社区，为创新赋能！
... 使用 Hyper-V 加速 或 切换到 ARM 版本的模拟器。如果还有问题，可以查看 Android Studio 的 AVD Manager 里模拟器的 CPU 选项，确保选择了 x86 而不是 x86_64，或者使用 ARM 版本的系统镜像。
When is a language considered a scripting language? [closed]
...people say "when it gets interpreted instead of compiled". That would make PHP (for example) a scripting language. Is that the only criterion? Or are there other criteria?
...
“Keep Me Logged In” - the best approach
..._URANDOM)...
The hash_equals() is to prevent timing attacks.
If you use a PHP version below PHP 5.6 the function hash_equals() is not supported. In this case you can replace hash_equals() with the timingSafeCompare function:
/**
* A timing safe equals comparison
*
* To prevent leaking length in...
How to pass parameters in GET requests with jQuery
...ng to handle error
}
});
And you can get the data by (if you are using PHP)
$_GET['ajaxid'] //gives 4
$_GET['UserID'] //gives you the sent userid
In aspx, I believe it is (might be wrong)
Request.QueryString["ajaxid"].ToString();
...
Why does this (null || !TryParse) conditional result in “use of unassigned local variable”?
...l repro:
class Program
{
static bool M(out int x)
{
x = 123;
return true;
}
static int N(dynamic d)
{
int y;
if(d || M(out y))
y = 10;
return y;
}
}
I see no reason why that should be illegal; if you replace dynamic ...
How to construct a REST API that takes an array of id's for the resources
...ry parameters will be combined into an array. With the above query string, PHP happens to tell you that id equals [1, 2, 3], but Ruby on Rails tells you it equals 3, and other frameworks may also act differently, e.g. saying id equals 1. URLs like …?id=1,2,3 avoid this potential for confusion.
...
On delete cascade with doctrine2
..., you configure the @JoinColumn with
the onDelete="CASCADE" option.
<?php
namespace Entities;
use Doctrine\Common\Collections\ArrayCollection;
/**
* @Entity
* @Table(name="contacts")
*/
class Contact
{
/**
* @Id
* @Column(type="integer", name="contact_id")
* @Gener...