const

typedef in c: struct or function reference?

由 两盒软妹~` 提交于 2020-05-14 07:49:36
问题 Analyzing some part of software written by someone else, I found the following line of code: typedef const struct rpc_method *(*super_t)(RPC*); Ok, i know, typedef rpc_method *(*super_t)(RPC*); declares a type super_t which is a function pointer... I also know what typedef struct means, but the combination of the two?? Is it a struct with a single entry??? And what means const in this context?? Could it be that const and struct are exchanged??? Nevertheless seems to compile with my gcc eabi.

typedef in c: struct or function reference?

由 时间秒杀一切 提交于 2020-05-14 07:45:08
问题 Analyzing some part of software written by someone else, I found the following line of code: typedef const struct rpc_method *(*super_t)(RPC*); Ok, i know, typedef rpc_method *(*super_t)(RPC*); declares a type super_t which is a function pointer... I also know what typedef struct means, but the combination of the two?? Is it a struct with a single entry??? And what means const in this context?? Could it be that const and struct are exchanged??? Nevertheless seems to compile with my gcc eabi.

typedef in c: struct or function reference?

由 China☆狼群 提交于 2020-05-14 07:45:04
问题 Analyzing some part of software written by someone else, I found the following line of code: typedef const struct rpc_method *(*super_t)(RPC*); Ok, i know, typedef rpc_method *(*super_t)(RPC*); declares a type super_t which is a function pointer... I also know what typedef struct means, but the combination of the two?? Is it a struct with a single entry??? And what means const in this context?? Could it be that const and struct are exchanged??? Nevertheless seems to compile with my gcc eabi.

c++ function syntax/prototype - data type after brackets

由 蓝咒 提交于 2020-05-13 01:23:19
问题 I am very familiar with C/C++ standard function declarations. I've recently seen something like this: int myfunction(char parameter) const The above is only a hypothetical example and I don't even know if it makes sense. I'm referring to the part AFTER the parameter. The const. What is this? A more real example: wxGridCellCoordsArray GetSelectedCells() const This can be found here So what exactly is that text const doing at the end of the line? 回答1: The const keyword, when shown after a

c++ function syntax/prototype - data type after brackets

由 别等时光非礼了梦想. 提交于 2020-05-13 01:20:53
问题 I am very familiar with C/C++ standard function declarations. I've recently seen something like this: int myfunction(char parameter) const The above is only a hypothetical example and I don't even know if it makes sense. I'm referring to the part AFTER the parameter. The const. What is this? A more real example: wxGridCellCoordsArray GetSelectedCells() const This can be found here So what exactly is that text const doing at the end of the line? 回答1: The const keyword, when shown after a

c++ function syntax/prototype - data type after brackets

由 拥有回忆 提交于 2020-05-13 01:20:52
问题 I am very familiar with C/C++ standard function declarations. I've recently seen something like this: int myfunction(char parameter) const The above is only a hypothetical example and I don't even know if it makes sense. I'm referring to the part AFTER the parameter. The const. What is this? A more real example: wxGridCellCoordsArray GetSelectedCells() const This can be found here So what exactly is that text const doing at the end of the line? 回答1: The const keyword, when shown after a

What is the difference between static const int and static int const?

由 北战南征 提交于 2020-04-16 03:32:48
问题 In this answer the OP used: static int const var = 5; in the context of a Conditional Compilation Control. Is there a difference between using static const int and static int const ? Like for example: static const int var; vs. static int const var; I don´t know the technique to imply the type in the middle between static and const . Is there a difference? 回答1: The grammar for declaration specifiers is given in C 2018 6.7 1, and it shows that specifiers for storage class (such as static ),

Is there no difference between let and const inside for of loop in Javascript in terms of declaration?

由 [亡魂溺海] 提交于 2020-04-14 08:29:49
问题 I recently came across this code: for (const temp of [1,2]) { // do something } I thought that it'd be better to use let declaration for temp because this way the variable would be declared only once. However, I also ran this example as well as the version with let through babel and this is what I see: for (const p of [1,2]) { } for (let s of [1,2]) { } became: for (var _i = 0, _arr = [1, 2]; _i < _arr.length; _i++) { var p = _arr[_i]; } for (var _i2 = 0, _arr2 = [1, 2]; _i2 < _arr2.length;

Is there no difference between let and const inside for of loop in Javascript in terms of declaration?

由 99封情书 提交于 2020-04-14 08:28:08
问题 I recently came across this code: for (const temp of [1,2]) { // do something } I thought that it'd be better to use let declaration for temp because this way the variable would be declared only once. However, I also ran this example as well as the version with let through babel and this is what I see: for (const p of [1,2]) { } for (let s of [1,2]) { } became: for (var _i = 0, _arr = [1, 2]; _i < _arr.length; _i++) { var p = _arr[_i]; } for (var _i2 = 0, _arr2 = [1, 2]; _i2 < _arr2.length;

Binder进程间通信系统第五篇-----Binder进程间通信实例

由 ☆樱花仙子☆ 提交于 2020-04-08 09:21:17
注意1 class IFregService: public IInterface 服务接口是为 class BnFregService: public BnInterface 服务的，如下声明和定义的服务接口，是为FregService服务提供的接口，这是Binder进程间通信的基本要求，Binder进程间通信机制要求提供服务的一方必须提供一个跨进程访问能力的服务接口，以便使用服务的一方可以通过该接口来访问服务。接口名就是 descriptor ： " hr.ma.IFregService " 。客户进程可以在 service manager中通过该 名称 获取服务的接口，然后访问服务。 DECLARE_META_INTERFACE(FregService); /* * 0. 使用宏 IMPLEMENT_META_INTERFACE 来实现IFregService类的元接口 * 1. 将 IFregService类的静态成员变量 descriptor 设置为 " hr.ma.IFregService " * 2. 实现了 IFregService类的构造函数和析构函数,是空函数 * 3. 实现了成员函数 getInterfaceDescriptor() ，用来获取一个IFregService类的描述符，即 descriptor * 4. 实现了 asInterface()
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