runtime.h

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#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

typedef struct objc_object *id;

typedef const struct objc_selector *SEL;

typedef struct objc_class *Class;

typedef id (*IMP)(id, SEL, ...);

typedef struct objc_method *Method;

typedef struct objc_protocol objc_protocol_t;

#define nil ((id)0)

#define Nil ((Class)0)

// Booleans

typedef bool BOOL;

#define YES true

#define NO false

#if __has_attribute(objc_root_class)
#define OBJC_ROOT_CLASS __attribute__((objc_root_class))
#else
#define OBJC_ROOT_CLASS
#endif

#if __has_attribute(unused)
#define OBJC_UNUSED __attribute__((unused))
#else
#define OBJC_UNUSED
#endif

#define OBJC_REQUIRES_NIL_TERMINATION

Class objc_lookupClass(const char *name);

const char *class_getName(Class cls);

const char *object_getClassName(id obj);

Class object_getClass(id object);

void object_setClass(id object, Class cls);

BOOL object_respondsToSelector(id object, SEL sel);

Class object_getSuperclass(id obj);

Class class_getSuperclass(Class cls);

BOOL object_isKindOfClass(id object, Class cls);

size_t class_getInstanceSize(Class cls);

BOOL class_metaclassRespondsToSelector(Class cls, SEL sel);

BOOL class_respondsToSelector(Class cls, SEL sel);

const char *sel_getName(SEL sel);

const char *proto_getName(objc_protocol_t *protocol);

BOOL proto_conformsTo(objc_protocol_t *protocol,
                      objc_protocol_t *otherProtocol);

BOOL class_conformsTo(Class cls, objc_protocol_t *otherProtocol);