Use of "this" keyword in C++ [duplicate]

Question

Possible Duplicate:
Is excessive use of this in C++ a code smell
When should you use the "this" keyword in C++?
Is there any reason to use this->

In C++, is the keyword this usually omitted? For example:

Person::Person(int age) {     _age = age; } 

As opposed to:

Person::Person(int age) {     this->_age = age; } 

Answer 1

Yes, it is not required and is usually omitted. It might be required for accessing variables after they have been overridden in the scope though:

Person::Person() {     int age;     this->age = 1; } 

Also, this:

Person::Person(int _age) {     age = _age; } 

It is pretty bad style; if you need an initializer with the same name use this notation:

Person::Person(int age) : age(age) {} 

More info here: https://en.cppreference.com/w/cpp/language/initializer_list

Answer 2

It's programmer preference. Personally, I love using this since it explicitly marks the object members. Of course the _ does the same thing (only when you follow the convention)