mutable英音:'mju:təbl美音:'mjutəb!,形容词,意为易变的;反复无常的。在C++语言中,是命令语言——如果一个函数被const 修饰,那么它将无法修改其成员变量的,但是如果这个成员变量是被mutable修饰的话,则可以修改。 mutable 可以用来指出,即使结构或者类变量为const,其某个成员也可以被修改。 在c++的类中,...
4. mutable 关键词施行于 nonstatic const data member 之上 , 可以有效解放其 bitwise constness 方面的束缚。条款 22: 尽量用 “ 传引用 ” 而不用 “ 传值 ” 1. C 语言中的每样东西都是 passed by value 。 C++ 把 pass-by-value 当作缺省行为 , 除非另行指定 , 否则函数参数都是以实参的副本作为...
(cString: UnsafePointer) , Also consider using String(cString:), that will attempt to repair ill-formed code units., But this pointer still refers to the same ( immutable) storage , i.e. this causes undefined, This would be undefined behavior: let mutablePointer = s.withCString { cString...
这就是Surface数据好了就通知消费者来拿数据做显示用,在onFrameAvailable函数汇总,通过nextBuffer获得图像数据,然后调用HWComposer对象mHwc的fbPost函数输出。 FramebufferSurface类位于frameworks/native/services/surfaceflinger/displayhardware/FramebufferSurface.cpp中,我们查看它的的onFrameAvailable函数: 1 2 3 4 5 6 ...
DNS DomainNameSystem域名系统，根据域名查出IP地址 1.dig命令可以显示整个查询的过程 root@VM-38-204-...
}string dec(string s) {td::BufferSlice buf(s);buf = td::gzdecode(buf);string ans = "";for (int i = 0; i < buf.size(); i++) {ans += buf[i];}return ans;}bool comp(int a, int b) {if ((int)(u_char)cells_info[a][1] != (int)(u_char)cells_info[b][1]) {...
4. %immutable directive stays in effect until it is explicitly disabled or cleared using %mutable.(vars with const decorator) 5. To create a constant, use #define, enum , or the %constant directive 6. Global functions are wrapped as new Python built-in functions. ...
从Makefile文件可以看出,相关依赖和主文件会被编译成libsurfaceflinger.so,然后SurfaceFlinger是对库的一个“封装调用”,里面有个main_surfaceflinger.cpp,我们可以沿着它的main函数往下分析。 启动流程大概如下图,我才刚刚学了时序图,不知道画的对不对。。。 启动...
StringSubject.isNotEmpty()方法的具体详情如下:包路径:com.google.common.truth.StringSubject类名称:StringSubject方法名:isNotEmpty StringSubject.isNotEmpty介绍 [英]Fails if the string is equal to the zero-length "empty string."[中]如果字符串等于零长度的“空字符串”,则失败 代码示例 代码示例来源:...
QStringfileName; QByteArrayencodedFileName; boolreadOnly; QFreetypeFace*freetype; FaceIdface_id; QByteArrayfreetypeCMapTable; mutableboolkerning_pairs_loaded; QFontEngine*renderingFontEngine; }; structQPFGenerator { QPFGenerator(QBuffer*device,QFontEngine*engine) ...