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Showing content from https://en.cppreference.com/w/cpp/language/../error/../language/../types/alignment_of.html below:

std::alignment_of - cppreference.com

template< class T > struct alignment_of;

(since C++11)

Provides the member constant value equal to the alignment requirement of the type T, as if obtained by an alignof expression. If T is an array type, returns the alignment requirements of the element type. If T is a reference type, returns the alignment requirements of the type referred to.

If alignof(T) is not a valid expression, the behavior is undefined.

If the program adds specializations for std::alignment_of or std::alignment_of_v(since C++17), the behavior is undefined.

[edit] Helper variable template template< class T > constexpr std::size_t alignment_of_v = alignment_of<T>::value; (since C++17) Inherited from std::integral_constant Member constants alignof(T)
(public static member constant) Member functions converts the object to std::size_t, returns value
(public member function) returns value
(public member function) Member types [edit] Possible implementation [edit] Notes

This type trait predates the alignof keyword, which can be used to obtain the same value with less verbosity.

[edit] Example

#include <cstdint>
#include <iostream>
#include <type_traits>
 
struct A {};
struct B
{
    std::int8_t p;
    std::int16_t q;
};
 
int main()
{
    std::cout << std::alignment_of<A>::value << ' ';
    std::cout << std::alignment_of<B>::value << ' ';
    std::cout << std::alignment_of<int>() << ' '; // alt syntax
    std::cout << std::alignment_of_v<double> << '\n'; // c++17 alt syntax
}

Possible output:

[edit] See also alignof (C++11) queries alignment requirements of a type
(operator)[edit] alignas (C++11) specifies that the storage for the variable should be aligned by specific amount
(specifier)[edit]

(since C++11)(deprecated in C++23)

defines the type suitable for use as uninitialized storage for types of given size
(class template) [edit]

(since C++11)(deprecated in C++23)

defines the type suitable for use as uninitialized storage for all given types
(class template) [edit] trivial type with alignment requirement as great as any other scalar type
(typedef) [edit]

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