this type in c++ code example

Example 1: define type c++

typedef unsigned int u_int; //giving 'unsigned int' a name of u_int

Example 2: what type is this c++

class ClassName {
  void foo() {
    // here `this` has `ClassName *` type
  }

  void bar() const {
    // here `this` has `const ClassName *` type
  }
};