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  1. #include <cstdint>
  2. #include <typeinfo>
  3. #include <iostream>
  4.  
  5. template<typename T> void check_aligned(void *p) {
  6.     std::cout << p << " is " <<
  7.       (0==(reinterpret_cast<std::intptr_t>(p) % alignof(T))?"":"NOT ") <<
  8.       "aligned for the type " << typeid(T).name() << '\n';
  9. }
  10.  
  11. void foo1() {
  12.     char a;
  13.     char b[sizeof (int)];
  14.     check_aligned<int>(b); // unaligned in clang
  15. }
  16.  
  17. struct S {
  18.     char a;
  19.     char b[sizeof(int)];
  20. };
  21.  
  22. void foo2() {
  23.     S s;
  24.     check_aligned<int>(s.b); // unaligned in clang and msvc
  25. }
  26.  
  27. S s;
  28.  
  29. void foo3() {
  30.     check_aligned<int>(s.b); // unaligned in clang, msvc, and gcc
  31. }
  32.  
  33. int main() {
  34.     foo1();
  35.     foo2();
  36.     foo3();
  37. }
  38.  
Success #stdin #stdout 0s 2928KB
comments (?)
stdin
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Standard input is empty
stdout
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0xbfc5f59c is aligned for the type i
0xbfc5f59c is aligned for the type i
0x8049c61 is NOT aligned for the type i
https://ideone.com/FFWCjf
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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