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I used some code like this:
void A() { typedef struct B B; struct B { }; B b; }; typedef and struct definition inside a function. It compiled with Clang, but I want to know (1) whether they are part of standard or not. And about (2) whether they are limited to be recognized in function scope only.
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Structures can be passed as function arguments like all other data types. We can pass individual members of a structure, an entire structure, or, a pointer to structure to a function. Like all other data types, a structure or a structure member or a pointer to a structure can be returned by a function.
In general, a pointer, or a struct that has elements that can reasonably be directly accessed should never be a typedef.
The C language contains the typedef keyword to allow users to provide alternative names for the primitive (e.g., int) and user-defined (e.g struct) data types. Remember, this keyword adds a new name for some existing data type but does not create a new type.
Yes you can. In c++, class and struct are kind of similar. We can define not only structure inside a class, but also a class inside one. It is called inner class.
Yes, the standard allows this, and yes, the name you create this way is only visible inside the function (i.e., it has local scope, just like when you define int i;, i has local scope).
It's more common, however to do it something like this:
typedef struct { /* ... */ } B; B b; If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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