Mastering ROS for Robotics Programming - Second Edition

Step 2 - Creating the calculator_plugins header file

The calculator_plugins.h file is present in the pluginlib_calculator/include/pluginlib_calculator folder, and the main purpose of this file is to define complete functions of the calculator plugins, which are named as Add, Sub, Mul, and Div. Here is the explanation of this code:

#include <pluginlib_calculator/calculator_base.h> 
#include <cmath> 
 
namespace calculator_plugins  
{ 
  class Add : public calculator_base::calc_functions 
  { 

This header file includes the calculator_base.h for accessing the basic functionalities of a calculator. Each plugin is defined as a class, and it inherits the calc_functions class from the calculator_base.h class:

class Add : public calculator_base::calc_functions ...