C结构中的函数定义？

Question

I have a C code I need to understand. There is a

typedef struct someStruct {
    int i; 
    char c; 
    someStruct() {
        i = 0;
        c = 'c';
    }
    someStruct(char inpChar) {
        i = 1;
        c = inpChar;
    }
} t_someStruct;

(The code doesn't really make sense or serve a purpose, I know. I just simplified it.) So there is this structure and it has two members (int i and char c). The interesting part is that it has basically two constructors, which is a new concept to me. It works normally, but can we write constructors for structures? I couldn't find anything on Google, maybe I am not searching right.

Answer 1

Your code is not valid C code (ie valid C11 ) code but it is valid C++ (ie C++14 ) code.

In C++, a struct is like a class except that all members are by default public ; see eg here .

Answer 2

There are no constructors in C.

This code is most probably in C++. In C++, a struct is actually similar to a class , hence you can define constructors for structs in C++.

Try to compile your code in gcc. You'll get a

error: expected specifier-qualifier-list before ‘someStruct’

Answer 3

The main difference between C and C++ is that C++ supports class but C does not. In C++ struct is a special class so the above code will work in C++ but not in C.