gecko-dev/xpcom/tests/ShowAlignments.cpp

/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* show the size and alignment requirements of various types */

#include "nsMemory.h"
#include <stdio.h>

struct S {
  double d;
  char c;
  short s;
};

int main()
{
  static const char str[] =
    "Type %s has size %u and alignment requirement %u\n";
  #define SHOW_TYPE(t_) \
    printf(str, #t_, unsigned(sizeof(t_)), unsigned(NS_ALIGNMENT_OF(t_)))

  SHOW_TYPE(char);
  SHOW_TYPE(unsigned short);
  SHOW_TYPE(int);
  SHOW_TYPE(long);
  SHOW_TYPE(uint8_t);
  SHOW_TYPE(int16_t);
  SHOW_TYPE(uint32_t);
  SHOW_TYPE(void*);
  SHOW_TYPE(double);
  SHOW_TYPE(short[7]);
  SHOW_TYPE(S);
  SHOW_TYPE(double S::*);

  return 0;
}