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Showing content from https://cplusplus.com/reference/type_traits/aligned_storage/ below:

class template

<type_traits>

template <size_t Len, size_t Align = /* default alignment */>struct aligned_storage;

Aligned storage

The obtained type is aliased as member type aligned_storage::type.

If Align is omitted, the most stringent alignment requirement for any C++ object type whose size is no greater than Len is used as default alignment.

Len

The size of the storage object, in bytes.
This shall not be zero.
size_t is an unsigned integral type.

Align

The alignment requested, in bytes. The actual alignment used may be a divisor of this value.
size_t is an unsigned integral type.

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// aligned_storage example
#include <iostream>
#include <type_traits>

struct A {  // non-POD type
  int avg;
  A (int a, int b) : avg((a+b)/2) {}
};

typedef std::aligned_storage<sizeof(A),alignof(A)>::type A_pod;

int main() {
  A_pod a,b;
  new (&a) A (10,20);
  b=a;
  std::cout << reinterpret_cast<A&>(b).avg << std::endl;

  return 0;
}

aligned_union

Aligned union (class template)

is_pod

Is POD type (class template)

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