fork download
copy 
  1. #include <iostream>
  2. #include <typeinfo>
  3.  
  4. using namespace std;
  5.  
  6. struct alignas(256) D {
  7.     char a;
  8.     char b;
  9.     };
  10.  
  11. template<typename T>
  12. void* alloc(size_t n) {
  13.     return reinterpret_cast<void*>(new
  14.                                    aligned_storage<sizeof(T), alignof(T)>[n]);
  15.     }
  16.  
  17. template<typename T>
  18. int allocSize() {
  19.     cout << "sizeof = " << sizeof(T) << ", alignof = " << alignof(
  20.              T) << endl;
  21.     cout << "type = " << typeid(typename
  22.                                 aligned_storage<sizeof(T), alignof(T)>::type).name() << endl;
  23.     return sizeof(typename
  24.                   aligned_storage<sizeof(T), alignof(T)>::type);
  25.     }
  26.  
  27.  
  28. int main() {
  29.     cout << allocSize<D>() << endl;
  30.     cout << alloc<D>(5) << endl;
  31.     }
  32.  
  33.  
Success #stdin #stdout 0s 4324KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
sizeof = 2, alignof = 1
type = NSt15aligned_storageILm2ELm1EE4typeE
2
0x561e6c6dec30
https://ideone.com/dgo75h
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!