Initialization

initialization2.cpp

#include <vector>

class B{};

class A{
    B b;
    public:
    A(B b):b(b){}
};

int main(){
    A a{B()}; // There is no ambiguity here.
    int var1{}; // Zero-initialized to 0;
    char* var2{};// Zero-initialized to nullptr;
    std::vector v1{}; // Each member is zero-initialized
    std::vector v2{1,2,3}; // Vector is initialized with
                           // 3 elements 1,2 and 3.
}