I Couldnt understand this syntax, related to vector intialization can someone explain? [duplicate]

Question

I couldn't understand the syntax of the way the vector root has been initialized with size sz in the constructor - UnionFind(int sz) : root(sz)

class UnionFind {
    public:
        UnionFind(int sz) : root(sz) {
            for (int i = 0; i < sz; i++) {
                root[i] = i;
            }
        }
    private:
        vector<int> root;
    };
    
    
    int main() {
        
       
        UnionFind uf(10);
    }

Luker

Its called a "member initializer list" – Wakayama

This is explained in any beginner level c++ book and various SO posts. Refer to how to ask where the first step is to "search and then research" and you'll find plenty of SO related question for this. – Dilapidated

Somyadeep, I added a thorough answer to your specific question here: https://mcmap.net/q/80502/-what-is-this-weird-colon-member-quot-quot-syntax-in-the-constructor – Brundisium

Answer 1

In any class, the members of class can be used like above the code type. Because constructor can access the members using : operator.

Equator