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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,因此尽量在最后的线程控制权转移的时候才lock,传递使用shared_ptr & 或 weak_ptr,可极大地减少锁的次数,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...
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的判断方法:
// 判断是否是手机端
function is_mobile() {
// 如果有HTTP_X_WAP_PROFILE则一定是移...
【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,存储的数据大于内存区大小,在free的时候也会检测出来,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自带的 asan...
安全工具将程序标记为病毒 - App应用开发 - 清泛IT社区,为创新赋能!
...也没有能力写出病毒,单纯的工厂生产计算程序,但安装时候,提示没有备案或国外软件,安全扫描标记为病毒,是因为没有备案码?问deepseek,说不应该是备案,程序采用注册机制,用数据库验证注册名和注册码,别的都是纯...
Android selector & text color
...oding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:color="#000000" /> <!-- pressed -->
<item android:state_focused="true"
android:color="#000000" /> <!-- focus...
Using build types in Gradle to run same app that uses ContentProvider on one device
..."?>
<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
android:accountType="@string/account_type"
android:icon="@drawable/ic_launcher"
android:smallIcon="@drawable/ic_launcher"
...
Animate the transition between fragments
...fade_in.xml:
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:interpolator/accelerate_quad"
android:valueFrom="0"
android:valueTo="1"
android:propertyName="alpha"
android:duration="@android:integer/config_mediumAnimTime...
十年磨一“饼” 一个70后连续创业者的心路历程 - 资讯 - 清泛网 - 专注C/C+...
...底越来越强烈,梦想再一次被点燃……
每每夜深人静的时候,追忆这十年的创业岁月,时光飞逝,一转眼自己就快到了“不惑”之年,创业这么久,有成功,有失败,也积累了些商业经验,可能生意和事业的本质区别就是能否...
Declaring a custom android UI element using XML
...l
Include the namespace declaration xmlns:app="http://schemas.android.com/apk/res-auto" in the top level xml element. Namespaces provide a method to avoid the conflicts that sometimes occur when different schemas use the same element names (see this article for more info). The URL is simply a manne...
How can I create a keystore?
... follow these steps:
1- On the menu bar, click Build > Generate Signed APK.
2-On the Generate Signed APK Wizard window, click Create new to create a new keystore.
If you already have a keystore, go to step 4.
3- On the New Key Store window, provide the required information as shown in figu...