Я работал над примером для изучения ООП в C. В настоящее время я придумал этот код, который работает, однако я заинтересован в том, чтобы методы неявно передавали себя как параметр.
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
//#include "Stopwatch.h"
typedef struct stopwatch_s
{
unsigned int milliseconds;
unsigned int seconds;
unsigned int minutes;
unsigned int hours;
bool is_enabled;
void ( *tick ) ( struct stopwatch_s* );
void ( *start ) ( struct stopwatch_s* );
void ( *stop ) ( struct stopwatch_s* );
void ( *reset ) ( struct stopwatch_s* );
} stopwatch_t;
static void tick (stopwatch_t* _self)
{
stopwatch_t * self = _self;
if (self->is_enabled)
{
self->milliseconds++;
if (self->milliseconds >= 1000)
{
self->milliseconds = 0;
self->seconds++;
if (self->seconds >= 60)
{
self->seconds = 0;
self->minutes++;
if (self->minutes >= 60)
{
self->minutes = 0;
self->hours++;
}
}
}
}
}
static void start (stopwatch_t* _self)
{
stopwatch_t * self = _self;
self->is_enabled = true;
}
static void stop (stopwatch_t* _self)
{
stopwatch_t * self = _self;
self->is_enabled = false;
}
static void reset (stopwatch_t* _self)
{
stopwatch_t * self = _self;
self->is_enabled = false;
self->milliseconds = 0;
self->seconds = 0;
self->minutes = 0;
self->hours = 0;
}
void * new_stopwatch()
{
stopwatch_t * newInstance = (stopwatch_t *)calloc(1, sizeof(stopwatch_t));
newInstance->is_enabled = false;
newInstance->milliseconds = 0;
newInstance->seconds = 0;
newInstance->minutes = 0;
newInstance->hours = 0;
newInstance->tick = &tick;
newInstance->start = &start;
newInstance->stop = &stop;
newInstance->reset = &reset;
return newInstance;
}
void main()
{
struct stopwatch_s * Stopwatch = new_stopwatch();
printf ("Initial: %d\n", Stopwatch->milliseconds);
Stopwatch->start (Stopwatch);
Stopwatch->tick (Stopwatch);
Stopwatch->tick (Stopwatch);
Stopwatch->tick (Stopwatch);
printf ("Started: %d\n", Stopwatch->milliseconds);
Stopwatch->stop (Stopwatch);
Stopwatch->tick (Stopwatch);
printf ("Stopped: %d\n", Stopwatch->milliseconds);
Stopwatch->reset (Stopwatch);
printf ("Reset: %d\n", Stopwatch->milliseconds);
}
Я пробовал читать и после объектно-ориентированное программирование с использованием ANSI-C, но не могу обернуть голову тем, как структурировать мои "объект", поэтому вместо
Stopwatch->tick(Stopwatch);
Я могу написать
Stopwatch->tick();