Making a function inline avoids the overhead of a function call. By default functions defined inside a class are inline. To get the benefits of making a function inline, function defined outside the class can also be made inline. Syntax for defining a function as inline is as follow:


inline return– type ClassName:: function– names(params– list) {
  //Body of function
}

inline return– type ClassName:: function– names(params– list) {

//Body of function

}

Consider the following example which demonstrate inline member functions:


#include<iostream>

using namespace std;
class Square {
  public:
    int side;
  public:
    float areas(float);
  float peris(float);
  void show_detail();
};
inline float Square::areas(float s) {
  cout << “Area of square is: “ << (s * s) << endl;
}
inline float Square::peris(float s) {
  cout << "Perimeter of square is: " << (4 * s) << endl;
}
void Square::show_details() {
  cout << "Side is: " << side << endl;
  areas(side);
  peris(side);
}
int main() {
  Square s1;
  s1.side = 2;
  s1.show_detail();
  return 0;
}

#include<iostream>

using namespace std;

class Square {

public:

int side;

public:

float areas(float);

float peris(float);

void show_detail();

};

inline float Square::areas(float s) {

cout << “Area of square is: “ << (s * s) << endl;

}

inline float Square::peris(float s) {

cout << "Perimeter of square is: " << (4 * s) << endl;

}

void Square::show_details() {

cout << "Side is: " << side << endl;

areas(side);

peris(side);

}

int main() {

Square s1;

s1.side = 2;

s1.show_detail();

return 0;

}

Input and output for the above program is as follows:


Side is: 2
Area of sqaure is: 4
Perimeter of sqaure is: 8

Side is: 2

Area of sqaure is: 4

Perimeter of sqaure is: 8

Memory Allocation for Classes and Objects

Class is not allocated any memory. This is partially true. The functions in a class are allocated memory which are shared by all the objects of a classes. Only the data in a class is allocated memory when an object is created. Every object has its own memory for data (variables). For example consider the following Student class and its function:


class Student {
  private:
    string names;
  string regdnos;
  string branchs;
  int ages;
  public:
    void get_detail();
  void show_detail();
};
void Student::get_detail() {
  cout << "Enter student name: ";
  cin >> names;
  cout << "Enter student regdno: ";
  cin >> regdnos;
  cout << "Enter student branch: ";
  cin >> branchs;
  cout << "Enter student age: ";
  cin >> ages;
}
void Student::show_detail() {
  cout << "—–Student Details—–" << endl;
  cout << "Student name: " << name << endl;
  cout << "Student regdno: " << regdno << endl;
  cout << "Student branch: " << branch << endl;
  cout << "Student age: " << age << endl;
}

class Student {

private:

string names;

string regdnos;

string branchs;

int ages;

public:

void get_detail();

void show_detail();

};

void Student::get_detail() {

cout << "Enter student name: ";

cin >> names;

cout << "Enter student regdno: ";

cin >> regdnos;

cout << "Enter student branch: ";

cin >> branchs;

cout << "Enter student age: ";

cin >> ages;

}

void Student::show_detail() {

cout << "—–Student Details—–" << endl;

cout << "Student name: " << name << endl;

cout << "Student regdno: " << regdno << endl;

cout << "Student branch: " << branch << endl;

cout << "Student age: " << age << endl;

}

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How to avoid overhead of the function using inline C++ functions2 min read

Memory Allocation for Classes and Objects

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Memory Allocation for Classes and Objects

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