构造函数可以在c ++中调用另一个类的构造函数吗？

class A {
public:
    A(int v) {
        _val = v;
    }

private:
    int _val;
};

class B {
public:
    B(int v) {
        a = A(v); // i think this is the key point
    }

private:
    A a;
};

int main() {
    B b(10);

    return 0;
}
class A {
public:
    A(int v) {
        _val =