How to let list can convert to my class object implicitly?

Question

For example, I have a class Point and has a function

void foo(Point pt);

call it as

foo({1, 2, 3});

Answer 1

#include <initializer_list>
#include <cassert>

struct bar
{
    void foo(const std::initializer_list<int>& bits)
    {
        assert(bits.size() == 3);
        auto i = bits.begin();
        x = *i++;
        y = *i++;
        z = *i++;
    }

    int x, y, z;
};

int main()
{
    bar b;
    b.foo({0, 1, 2});
}