Demonstration of dot notation and encapsulation in C

char_map.c

/* char_map.h */
#ifndef CHAR_MAP_H
#define CHAR_MAP_H

typedef struct char_map CharMap;
struct char_map {
    char wall;
    char corridor;
    char path;
    char entrance;
    char exit;

    void (*print)(CharMap* self);
    void (*delete)(CharMap* self);
};

extern const struct char_map_class {
    CharMap* (*new)();
} CharMapClass;

#endif

/* char_map.c */

#include "char_map.h"
#include <stdlib.h>
#include <stdio.h>

static CharMap* new();
const struct char_map_class CharMapClass = {
    .new = &new
};

static void print(CharMap* self);
static void delete(CharMap* self);
CharMap* new()
{
    CharMap* self = malloc(sizeof (CharMap));

    self->print = &print;
    self->delete = &delete;
    return self;
}

void print(CharMap* self)
{
    printf("%c%c%c%c%c",
           self->wall, self->corridor, self->path, self->entrance, self->exit);
}

void delete(CharMap* self)
{
    free(self);
}

/* main.c */
#include "char_map.h"
int main()
{
  CharMap* map = CharMapClass.new();
  map->print(map);
  map->delete(map);
  return 0;
}