CODEWITHSUNDEEP
c++
sarthak bansal
sarthak bansal

Reputation: 43

"this" keyword for const variable in initialising list

Why cant we use this in initialization list like this? It threw an error cant find { before this.. But scope is not the problem because the second code works

class Student {
public :
    int age;
    const int rollNumber;
    int &x;     // age reference variable

    Student(int r, int age) : rollNumber(r), this->age(age), x(this -> age) {
        //rollNumber = r;
    }

"This" one works:

class Student {
public :
    int age;
    const int rollNumber;int &x;


    Student(int r, int age) : rollNumber(r), x(this -> age) {
        //rollNumber = r;
    }

I know we have to declare and initialize const and reference variables at same time but I want to initialize them after taking an input and passing to my objects

Upvotes: 0

Views: 67

Answers (1)

kabanus
kabanus

Reputation: 25895

The short answer is "this is how it was decided the syntax would be", but from a philosophical standpoint, you might say that this->age does not exist in the initializer list (since you did not construct this yet...). Just:

age(age)

is the correct syntax, and it is clear from the context which age is which here.

Upvotes: 5

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