C++ struct keyword usage [duplicate]

Question

I'm setting up a basic socket server following this guide: https://www.geeksforgeeks.org/socket-programming-cc/

So, I know that when you use the keyword struct it's to define a data structure, but as you can see in the example, it creates an instance of sockaddr_in using the structure keyword, but it's not for creating/defining the structure, it's to create an instance.

So I'm wondering why in this guide to define a sockaddr_in structure he puts the 'structure' keyword before, I tried it without and it compiles all correctly.

Is there any reason behind?

in c you need to put the keyword when declaring an instance of a struct. Iirc it is something about structs living in a different namespace. Almost sure there is a duplicate somewhere... — 463035818_is_not_an_ai
– 463035818_is_not_an_ai, Commented Aug 16, 2018 at 7:25
well, not the best dupe, but the answer explains the reasons — 463035818_is_not_an_ai
– 463035818_is_not_an_ai, Commented Aug 16, 2018 at 7:28

Eyal Cinamon · Accepted Answer · 2018-08-16 07:25:50Z

7

using struct when declaring an instance of a struct comes from C. It is optional in C++.

answered Aug 16, 2018 at 7:25

Eyal Cinamon

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Comments

Kaldrr · Accepted Answer · 2018-08-16 07:42:19Z

The source files shown in your link are both written in C, not C++. In C, when declaring an instance of a struct, you need the struct keyword, like this.

struct sockaddr_in address;

In C++ you don't need to do this anymore.

Ido H Levi · Accepted Answer · 2018-08-16 07:27:08Z

The article that you've mentioned is written in C, which in C when you create a struct and you try to use it as a type, you have to mention that it's a struct. If you want to give up on the struct, you can read more about the typedef operator.

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