1. If all members in a class are public, the class is not required to provide a constructor.
  2. The values are resolved positionally based on the declaration order of the data members. 
    #include <iostream>
   
class Foo {
public:
   int ival;
   const char* ptr;
};
   
int main() {
    Foo foo = {1, "abc"};
    // Foo foo = {"abc", 1}; // Error
    std::cout << foo.ival << std::endl;
    std::cout << foo.ptr  << std::endl;
    return 0;
}
  3. Two primary drawbacks to the explicit initialization list are that: