what is the class in c++ code example

Example 1: classes c++

class class_name {
  access_specifier_1:
    member1;
  access_specifier_2:
    member2;
  ...
} object_names;

Example 2: c++ classes

class SampleClass
{
    int a;
public:
    SampleClass(int v)
    {
        a=v;
    }
    int RetVal()
    {
        return a;
    }
};