I have seen many programs consisting of structures like the one below typedef struct { int i; char k; } elem; elem user; Why is it needed so often? Any specific reason or applicable area? 15 s 15 As Greg Hewgill said, the typedef means you no longer have to write struct all over the … Read more
I’m learning how to dynamically load DLL’s but what I don’t understand is this line typedef void (*FunctionFunc)(); I have a few questions. If someone is able to answer them I would be grateful. Why is typedef used? The syntax looks odd; after void should there not be a function name or something? It looks … Read more
In C++, is there any difference between: struct Foo { … }; and: typedef struct { … } Foo; 8 s 8 In C++, there is only a subtle difference. It’s a holdover from C, in which it makes a difference. The C language standard (C89 §3.1.2.3, C99 §6.2.3, and C11 §6.2.3) mandates separate namespaces … Read more
[*] This question already has answers here: Why should we typedef a struct so often in C? (15 answers) Closed 5 years ago. I’m a beginner in C programming, but I was wondering what’s the difference between using typedef when defining a structure versus not using typedef. It seems to me like there’s really no … Read more
I don’t think I fundamentally understand what an enum is, and when to use it. For example: typedef enum { kCircle, kRectangle, kOblateSpheroid } ShapeType; What is really being declared here? 13 s 13 Three things are being declared here: an anonymous enumerated type is declared, ShapeType is being declared a typedef for that anonymous … Read more
I know that in C++11 we can now use using to write type alias, like typedefs: typedef int MyInt; Is, from what I understand, equivalent to: using MyInt = int; And that new syntax emerged from the effort to have a way to express “template typedef”: template< class T > using MyType = AnotherType< T, … Read more
