OC_block_0x02

有自变量Blok，但是没有__block修饰符；

struct __main_block_impl_0 {

  struct __block_impl impl;

  struct __main_block_desc_0* Desc;

  const char *fmt;

  int val;

  __main_block_impl_0(void *fp, struct __main_block_desc_0 *desc, const char *_fmt, int _val, int flags=0) : fmt(_fmt), val(_val) {

    impl.isa = &_NSConcreteStackBlock;

    impl.Flags = flags;

    impl.FuncPtr = fp;

    Desc = desc;

  }

};

static void __main_block_func_0(struct __main_block_impl_0 *__cself) {

  const char *fmt = __cself->fmt; // bound by copy

  int val = __cself->val; // bound by copy

printf(fmt, val);}

static struct __main_block_desc_0 {

  size_t reserved;

  size_t Block_size;

} __main_block_desc_0_DATA = { 0, sizeof(struct __main_block_impl_0)};

int main()

{

 int dmy = 256;

 int val = 10;

 const char *fmt = "val = %d\n";

 void (*blk)(void) = ((void (*)())&__main_block_impl_0((void *)__main_block_func_0, &__main_block_desc_0_DATA, fmt, val));

 ((void (*)(__block_impl *))((__block_impl *)blk)->FuncPtr)((__block_impl *)blk);

 return 0;

}

OC_block_0x02

原文：http://www.cnblogs.com/fkunlam/p/4906348.html