Classes

const methods

Methods marked with const are treated as read-only, meaning there cannot be any modification of object's state within them.

The const operator is applied on after the name of method.

class Guitar {
public:
    int get_number_of_strings() const {
        return this->stringNumber;
    }
private:
    int stringNumber = 6;
};

void classes() {
    Guitar guitar{};
    printf("Number of strings: %d\n", guitar.get_number_of_strings());
}

const member variables

Class member variables that cannot be modified after their initialization

class Book {
public:
    const int year = 2000;
};

Member initializer lists

Primary mechanism for initializing class members. They help with initializing members via constructor like so:

class Book {
    int year;
    char* title;

public:
    Book(int year, char* title): year { year }, title { title } {}
};