cpp initialization list code example

Example 1: member initializer list in c++

// Constructor Member Initializer List

#include <iostream>

class Example
{
private:
    int x, y;

public:
    Example() : x(0), y(0) {}
    Example(int x1, int y1) : x(x1), y(y1) {}
    ~Example() {}
};

int main()
{
    Example e;
}

Example 2: initialization list c++

struct S {
    int n;
    S(int); // constructor declaration
    S() : n(7) {} // constructor definition.
                  // ": n(7)" is the initializer list
};

S::S(int x) : n{x} {} // constructor definition. ": n{x}" is the initializer list

int main() {
    S s; // calls S::S()
    S s2(10); // calls S::S(int)
}