C++03 alternative for std::aligned_storage

It is possible to implement alignof in C++03 for most types, for example there is a long explanation on this page.

With that, you could use a storage type with that alignment using some template specializations:

#include<iostream>

struct alignment {};

template<>
struct alignment<1> {
  typedef char type;
  static const unsigned div_v=sizeof(type);
  static const unsigned add_v=div_v-1;
};
template<>
struct alignment<2> {
  typedef short type;
  static const unsigned div_v=sizeof(type);
  static const unsigned add_v=div_v-1;
};
template<>
struct alignment<4> {
  typedef int type;
  static const unsigned div_v=sizeof(type);
  static const unsigned add_v=div_v-1;
};
template<>
struct alignment<8> {
  typedef double type;
  static const unsigned div_v=sizeof(type);
  static const unsigned add_v=div_v-1;
};

template<typename T>
struct align_store {
  typedef alignment<__alignof(T)> ah;

  typename ah::type data[(ah::add_v + sizeof(T))/ah::div_v];
};

int main() {
  std::cout << __alignof(align_store<int>) << std::endl;
  std::cout << __alignof(align_store<double>) << std::endl;
}