Strange errors in c (struct before variable declaration)

Question

Why in Xcode I have error in line:

my_type a;

there must be (according to Xcode):

struct my_type a;

But in TOR code I see what they do not use struct before variable declaration.

how does it work?

Either my_type is a typedef or you're compiling with a C++ compiler. — dbush
– dbush, Commented Nov 14, 2020 at 20:40
I believe C++ will also look in the namespace for struct tags when it can't find an identifier in the "regular" namespace. C needs to be told to look there. — pmg
– pmg, Commented Nov 14, 2020 at 20:44

Zyycyx · Accepted Answer · 2020-11-14 23:10:32Z

1

Okay, so structs in C. You have two options. You can do something like

struct a {
        ...
};

struct a a1;

//OR

typedef struct a {


} a;


a a1;

edited Nov 14, 2020 at 23:10

answered Nov 14, 2020 at 20:45

Zyycyx

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4 Comments

klutt Over a year ago

Why do you name it atype instead of just a? Nothing prevents you from giving the same name.

THND Over a year ago

it's very cool, I don't know that, but in tor code there is not "typedef struct ..." There is only "struct cell_t { };" but if they make variables they use "cell_t" without "struct"!

klutt Over a year ago

@Zyycyx How is it more understandable? If you think atype is more descriptive, then use typedef struct atype { ... } atype

Zyycyx Over a year ago

@klutt Well, maybe you're right. Thank you for the suggestion.

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