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C++ 智能指针shared_ptr,weak_ptr,shared_from_this实践 - C/C++ - 清泛网 - 专注C/C++及内核技术

...指针 lock 时会加锁,因此尽量在最后线程控制权转移时候才lock,传递使用shared_ptr & 或 weak_ptr,可极大地减少锁次数,提高效率。(强指针赋值加锁,弱指针不加锁且对象很小在栈上完成拷贝,效率相差不大) 2438c++11,sh...
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js/php判断终端类型:PC访问、手机访问、微信访问 - 更多技术 - 清泛网 - ...

....href="https://www.tsingfun.com/index.php?m=wap"; } </script> 不过有时候还是后端判断直接定位相应模板来得直接,不用中转一道,这里提供php判断方法: // 判断是否是手机端 function is_mobile() { // 如果有HTTP_X_WAP_PROFILE则一定是移...
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【解决】double free or corruption (!prev) - C/C++ - 清泛网 - 专注C/C++及内核技术

...,如果操作不当,存储数据大于内存区大小,在free时候也会检测出来,报这个错误,如: char* buf = malloc(5); memcpy(buf, "123456", 6); free(buf); //free时报此错误 实际项目中可能此类问题没法直观定位到,推荐使用gcc自带 asan...
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UrsPahoMqttClient心跳问题解决——Paho底层已自动处理,设好KeepAlive就行...

... Paho CommsSender 线程自动管理了。你只需要在 Connect 时候传一个 keepAliveSeconds 参数就行。 Connect 积木块长这样: Connect(brokerAddress, clientId, username, password, keepAliveSeconds) keepAliveSeconds 设多少? - 推荐设 30-60 秒 - 设 60 秒...
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Style bottom Line in Android

... of the height. &lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;item&gt; &lt;shape android:shape="rectangle" &gt; &lt;solid android:color="#1bd4f6" /&gt; &lt;/shape&gt; &lt;/item&gt; &lt;item android:top="-2dp" android:rig...
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How do I create a ListView with rounded corners in Android?

...encoding="UTF-8"?&gt; &lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"&gt; &lt;gradient android:startColor="#SomeGradientBeginColor" android:endColor="#SomeGradientEndColor" android:angle="270"/&gt; &lt;cor...
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Typical .gitignore file for an Android app

... You can mix Android.gitignore: # built application files *.apk *.ap_ # files for the dex VM *.dex # Java class files *.class # generated files bin/ gen/ # Local configuration file (sdk path, etc) local.properties with Eclipse.gitignore: *.pydevproject .project .metadata bin/**...
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编译失败! Error: Your build failed due to an error in the AAPT stage,...

编译apk报错如下: 经过日志分析如下: Tag &lt;activity&gt; attribute name has invalid character [java] /tmp/1685410160630_0.39828964915976717-0/youngandroidproject/../build/AndroidManifest.xml:5: Tag &lt;activity&gt; attribute name has invalid character '�'. &nbsp; &nbsp;&n...
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CentOS 6.4下Squid代理服务器安装与配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...载一个主页时,可以向Squid 发出一个申请,要Squid 代替其进行下载,然后Squid 连接所申请网站并请求该主页,接着把该主页传给用户同时保留一个备份,当别用户申请同样页面时,Squid 把保存备份立即传给用户,使用户觉...
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How to increase storage for Android Emulator? (INSTALL_FAILED_INSUFFICIENT_STORAGE)

...hat the "partition-size" is in megabytes, and that generally to install an APK you need at least twice as much disk space as the size of the APK. – Christopher Orr Dec 26 '10 at 17:11 ...