aligned_storage Class

 

Makes suitably aligned type.

template<std::size_t Len, std::size_t Align>
    struct aligned_storage;

template <std::size_t Len, std::size_t Align = alignment_of<max_align_t>::value>
    using aligned_storage_t = typename aligned_storage<Len, Align>::type;

Len

The object size.

Align

The object alignment.

The template member typedef type is a synonym for a POD type with alignment Align and size Len. Align must be equal to alignment_of<T>::value for some type T, or to the default alignment.

Example

 

#include <type_traits> 
#include <iostream> 

typedef std::aligned_storage<sizeof (int), 
    std::alignment_of<double>::value>::type New_type; 
int main() 
    { 
    std::cout << "alignment_of<int> == " 
        << std::alignment_of<int>::value << std::endl; 
    std::cout << "aligned to double == " 
        << std::alignment_of<New_type>::value << std::endl; 

    return (0); 
    } 

alignment_of<int> == 4
aligned to double == 8

Requirements

Header: <type_traits>

Namespace: std

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