The this pointer is a keyword for C++ therfore there is no library needed to implement this. And do not forget this is a pointer! So you cannot do:
this.someMember();
As you access member functions or member variables from pointers using the arrow symbol -> :
this->someMember();
Other helpful links to the better understanding of the this pointer :
http://www.geeksforgeeks.org/this-pointer-in-c/
https://www.tutorialspoint.com/cplusplus/cpp_this_pointer.htm