Object Oriented C Programming

You may have noticed that our structs are a bit strange with many function pointers, like the following:

typedef struct Vector
{
  const size_t block_size;
  int * data;       // the memory block
  size_t capacity; // size of the memory block
  size_t size;     // length of the vector

  void (*create)(struct Vector * self);
  void (*delete)(struct Vector * self);

  int (*get)(struct Vector * self, size_t index);
  void (*set)(struct Vector * self, size_t index, int value);

  void (*add_at)(struct Vector * self, size_t index, int value);
  int (*remove_at)(struct Vector * self, size_t index, int value);
} Vector;

This is actually a tecnique called Object Oriented C

For tutorial you can read

Chapter 15: Navigating Object-Oriented Programming in C » TheCloudStrapTheCloudStrap

For more detailed books, you can read