Aggregates in C++

An aggregate class gives users direct access to its members and has special initialization syntax. A class is an aggregate if

• All of its data members are public,
• It does not define any constructors,
• It has no in-class initializers, and
• It has no base classes or virtual functions, which are class-related features that we’ll cover in Chapter 15,

For example, the following class is an aggregate:

struct Data {
  int ival;
  string s;
};

We can initialize the data members of an aggregate class by providing a braced list of member initializers:

Data val1 = { 0, "Anna"};