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Typedef information


typedef is a reserved keyword in the programming languages C, C++, and Objective-C. It is used to create an additional name (alias) for another data type, but does not create a new type,[1] except in the obscure case of a qualified typedef of an array type where the typedef qualifiers are transferred to the array element type.[2] As such, it is often used to simplify the syntax of declaring complex data structures consisting of struct and union types, although it is also commonly used to provide specific descriptive type names for integer data types of varying sizes.[1]

  1. ^ a b Kernighan, Brian W.; Ritchie, Dennis M. (1988). The C Programming Language (2nd ed.). Englewood Cliffs, New Jersey.: Prentice Hall. p. 147. ISBN 0-13-110362-8. Retrieved 18 June 2016. C provides a facility called typedef for creating new data type names. … It must be emphasized that a typedef declaration does not create a new type in any sense; it merely adds a new name for some existing type.
  2. ^ "const type qualifier". cppreference.com. Retrieved 2020-10-20.

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Typedef

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typedef is a reserved keyword in the programming languages C, C++, and Objective-C. It is used to create an additional name (alias) for another data type...

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Substitution failure is not an error

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following example illustrates a basic instance of SFINAE: struct Test { typedef int foo; }; template <typename T> void f(typename T::foo) {} // Definition...

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Compound File Binary Format

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typedef ULONG FSINDEX; // 4 Bytes typedef USHORT FSOFFSET; // 2 Bytes typedef USHORT WCHAR; // 2 Bytes typedef ULONG DFSIGNATURE; // 4 Bytes typedef unsigned...

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Abstract data type

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imperative-style interface might be: typedef struct stack_Rep stack_Rep; // type: stack instance representation (opaque record) typedef stack_Rep* stack_T; // type:...

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Composite data type

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constructing composite types: typedef struct { int x; int y; } Point; typedef double (*Metric) (Point p1, Point p2); typedef struct { Point centre; double...

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Function pointer

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(pFoo->*pfn)(i,j); } typedef int(Foo::*Foo_pfn)(int,int); int bar2(int i, int j, Foo* pFoo, Foo_pfn pfn) { return (pFoo->*pfn)(i,j); } typedef auto(*PFN)(int)...

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C syntax

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which can be used for typedefs in standard headers. For more precise specification of width, programmers can and should use typedefs from the standard header...

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Tail call

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typedef struct list { void *value; struct list *next; } list; list *duplicate(const list *ls) { list *head = NULL; if (ls != NULL) { list *p = duplicate(ls->next);...

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Haxe

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type is used. typedef F1 = String -> Float; typedef F2 = (text:String) -> Float; typedef F3 = (score:Int, text:String) -> Float; typedef F4 = (score:Int...

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Computer program

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---------------------------------------------- */ #ifndef GRADE_H #define GRADE_H typedef struct { char letter; } GRADE; /* Constructor */ /* ----------- */ GRADE...

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Lexical analysis

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characters cannot be determined until the semantic analysis phase, since typedef names and variable names are lexically identical but constitute different...

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Enumerated type

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combined with a typedef, so that instead of naming the type enum name, simply name it name. This can be simulated in C using a typedef: typedef enum {Value1...

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Recursive descent parser

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implementations of the functions nextsym and error are omitted for simplicity. typedef enum {ident, number, lparen, rparen, times, slash, plus, minus, eql, neq...

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AltiVec

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operation when VSX is not available. #include <altivec.h> typedef __vector unsigned char uint8x16_p; typedef __vector unsigned int uint32x4_p; ... int main(int...

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Lexer hack

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casting the dereferenced value of B to the type A, in which case A is a typedef name; written unambiguously: (A) (*B) In more detail, in a compiler, the...

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GNU Bison

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operation type */ typedef enum tagEOperationType { eVALUE, eMULTIPLY, eADD } EOperationType; /** * @brief The expression structure */ typedef struct tagSExpression...

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Composite pattern

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#include <string> #include <list> #include <memory> #include <stdexcept> typedef double Currency; // declares the interface for objects in the composition...

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Dynamic loading

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straightforward, since FARPROC is essentially already a function pointer: typedef INT_PTR (*FARPROC)(void); This can be problematic when the address of an...

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Nominal type system

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even if they have identical field declarations. However, C also allows a typedef declaration, which introduces an alias for an existing type. These are...

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