将C语言转换为C++代码时,发生如下错误 sorry, unimplemented: non-trivial designated initializers not supported. 查找原因,是因为C++结构体初始化时,必须按照定义的顺序进行初始化,不能够跳过其中内容而初始化其他选项,或者定义的顺序先后有问题. eg: typedef struct   command { int   a; char *b; int c; int d; }; 在C语言中定义时候进行初始化,这个是可以的: s…

Swift defines two kinds of initializers for class types to help ensure all stored properties receive an initial value. These are known as designated initializers and convenience initializers. Designated:指定的:特指的 全初始化与部分初始化 Designated Initializers and…

原文网址:http://blog.csdn.net/ithomer/article/details/6977386 Android源码下载:官方下载 或参考android源码下载方式 Android编译版本: PLATFORM_VERSION=4.0.1(最新Android 4.0.1) OS 操作系统平台: Linux yanggang 2.6.35-30-generic #61-Ubuntu SMP Tue Oct 11 15:29:15 UTC 2011 i686 GNU/Linux(Ub…

c++ anonymous union,struct -- 匿名联合体和机构体 结构体和联合体各自的基本用法不赘述,仅说一下他们匿名时访问的情况.如果是token不同,可以直接跨层访问.例子 #include <iostream> using namespace std; struct zoo_obj{ string name; union { unsigned int property; struct{ //plant unsigned int hasLeaf:1, hasFlower:1,…

struct student { int age; string name; int id; }; 初始化: student st1={10, "li ming", 01}; 修改某个成员变量的值:st1.id = 11; 下面谈我遇到的问题:id的接口准备好了,然而不知道name的值,也就是只需要把age和id进行设置就可以了 已经存在的代码 const student st1 = {l_age}; 我需要将id计算出来并且添加进去,const student st1 = {l_ag…

swift引入后,为了使oc和swift更相近,对oc的初始化方法也进行了修正,具体说明,见下面的链接,这个waring的最简单的修正方法是,到相应类的头文件中,去掉在自定义初始化方法后面的 NS_DESIGNATED_INITIALIZER宏.这样系统就不会认为我们定义了designated initializer,仅仅定义了一个convience initializer,就不会报错了! 重要的解释如下: The designated initializer guarantees the ob…

Background C++ is one of the main development languages used by many of Google's open-source projects. As every C++ programmer knows, the language has many powerful features, but this power brings with it complexity, which in turn can make code more…

Google C++ Style Guide   Table of Contents Header Files Self-contained Headers The #define Guard Forward Declarations Inline Functions Names and Order of Includes Scoping Namespaces Unnamed Namespaces and Static Variables Nonmember, Static Member, an…

 一.NS_DESIGNATED_INITIALIZER 用来修饰init方法,被修饰的方法称为designated initializer:没有被这个修饰的init方法称为convenience initializer 参考1对之的说明为 1.A designated initializer must call (via super) a designated initializer of the superclass. Where NSObject is the superclass thi…

原档:https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Initialization.html#//apple_ref/doc/uid/TP40014097-CH18-ID203 参考:http://wiki.jikexueyuan.com/project/swift/chapter2/14_Initialization.html…