typedef struct

 typedef void (*sighandler_t) (int);sighandler_t signal (int signum, sighandler_t handler); Here, because a typedef has been added to customize a new type of sighandler_t, the second line of the function prototype looks much more pleasing, the form is the same as the int func (char c, int i), but if you do not understand the TypeDef statement, these two s

long, incomprehensible template-specific syntax, such as basic_string, Allocator> and basic_ofstream>. Usage of typedef in C Language1. Basic explanation Typedef is a key word in C language. It defines a new name for a data type. The data types here include internal data types (INT, Char, etc.) and Custom Data Types (struct, etc ). In programming,

, incomprehensible template-specific syntax, such as basic_string and allocator. > And basic_ofstream>. Usage of typedef in C Language1. Basic explanation Typedef is a key word in C language. It defines a new name for a data type. The data types here include internal data types (INT, Char, etc.) and Custom Data Types (struct, etc ). In programming,

* const ' (a pointer constant pointing to char), whereas in fact, the const char* and char* Const does not express the same meaning (see C + + Primer version fourth P112). char * Const CP: Defines a pointer constant that points to a character, a const pointer, and a constant pointer. Const char* P: Defines a pointer to a character constant, which is a constant pointer. Char const* p: equals the const char* p. In order to obtain the correct type, it should be stated as follows: 1

First to fourth useUse one:Defines an alias for a type, not just a simple macro substitution. Can be used as multiple objects that declare a pointer type at the same time. For example: char* PA, PB; The majority does not conform to our intention, it only declares a pointer to a character variable,//and a character variable; The following is possible: typedef char* PCHAR; General use capital PCHAR PA, PB; Possible, while declaring two pointers to chara

incomprehensible template special syntaxes, such as basic_string, Allocator> and basic_ofstream>. Usage of typedef in C Language1. Basic explanation Typedef is a key word in C language. It defines a new name for a data type. The data types here include internal data types (INT, Char, etc.) and Custom Data Types (struct, etc ). In programming,

Purpose 1 and 4 Purpose 1: Define a type of Alias, not just a simple macro replacement. It can be used as multiple objects that declare the pointer type at the same time. For example:Char * pA, PB; // most of them do not conform to our intention. It only declares a pointer to a character variable,// And a character variable;The following are feasible:Typedef char * pchar; // generally, uppercase is used.Pchar Pa, PB; // feasible. Two pointers pointing to character variables are declared at the s

Purpose 1 and 4 Purpose 1: Define a type of Alias, not just a simple macro replacement. It can be used as multiple objects that declare the pointer type at the same time. For example:Char * pA, PB; // most of them do not conform to our intention. It only declares a pointer to a character variable,// And a character variable;The following are feasible:Typedef char * pchar; // generally, uppercase is used.Pchar Pa, PB; // feasible. Two pointers pointing to character variables are declared at

Typedef Summary of typedef usage --During the two days of viewing the program, we found that typedef is used in many places, such as struct definition and arrays. however, it is not clear in some places that I want to study this afternoon. I searched the internet and found a lot of information. to sum up:Sour

Similarity point All use typedef to assign a simple name to a complex combination of types consisting of the underlying data type; All follow the tradition of C--the type defined by typedef ends with "_t"; Both can play a role in reducing the amount of code character input; "To some extent" increases the readability of the code (this view is not absolutely correct, The calling funct

hide the long, incomprehensible template-specific syntax,such as:basic_string,allocator> and basic_ofstream>.Use one:Defines an alias for a type, not just a simple macro substitution. Can be used as multiple objects that declare a pointer type at the same time. Like what:char* PA, PB; The majority does not conform to our intent, it only declares a pointer to a character variable,and a character variable;The following are possible:typedef char* PCHAR; General capitalizationPCHAR PA, PB; It is po

typedef void (*post_sync_t) (co_data*);The prototype of this function is void f (co_data*);After the typedef void (*post_sync_t) (co_data*), post_sync_t is the type alias of the pointer to the F-type function.At this point you can define a variable: post_sync_t p;,p is a pointer to the F-type function.You can assign a value to P, p=f.If you don't have a TypeDef,

int, float, and then use an alias in the main function to define the variable, which is exactly the same as the original primitive type. Output Result:Of course, the original int, float can still be used normally after giving the type an alias:int i = 10;float f = 10.0f;* You can also alias an alias based on thetypedef int INTEGER;TYPEDEF Integer Myinteger;II. typedef and PointersA

In the Linux environment, the structure struct sockaddr is defined in/usr/include/linux/socket.h, as follows: typedef unsigned short sa_family_t; struct SOCKADDR { sa_family_t sa_family; /* Address family, AF_XXX * * Char sa_data[14]; * Bytes of protocol address * * }; In the Linux environment, the structure struct