test.mm

#import <Foundation/Foundation.h>

int main(int argc, char **argv) {
  auto global = ^{ NSLog(@"Hello, world!"); };
  auto captures = ^{ NSLog(@"argc is %d", argc); };
  NSLog(@"global: %@ -  captures: %@", global, captures);
  NSLog(@"(void *)global: %p -  (void *)captures: %p", (void *)global, (void *)captures);
  
  id globalCopy = [global copy];
  id capturesCopy = [captures copy];
  NSLog(@"[global copy]: %@ - [captures copy]: %@", globalCopy, capturesCopy);
  NSLog(@"(void *)[global copy]: %p - (void *)[captures copy]: %p", (void *)globalCopy, (void *)capturesCopy);
}

// $ clang++ -framework Foundation -std=c++11 test.mm
// $ ./a.out 
// 2018-06-11 09:52:50.536 a.out[16828:73422403] global: <__NSGlobalBlock__: 0x1070cd048> -  captures: <__NSStackBlock__: 0x7ffee8b33988>
// 2018-06-11 09:52:50.536 a.out[16828:73422403] (void *)global: 0x1070cd048 -  (void *)captures: 0x7ffee8b33988
// 2018-06-11 09:52:50.536 a.out[16828:73422403] [global copy]: <__NSGlobalBlock__: 0x1070cd048> - [captures copy]: <__NSMallocBlock__: 0x7febfb000120>
// 2018-06-11 09:52:50.536 a.out[16828:73422403] (void *)[global copy]: 0x1070cd048 - (void *)[captures copy]: 0x7febfb000120