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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../c/language/../program/memalignment.html below:

memalignment - cppreference.com

size_t memalignment( const void *p ); (since C23)

Returns the maximum alignment satisfied by the provided address. The return value can be greater than any alignment value supported by the implementation. If p is a null pointer value, â0â is returned to indicate that the pointer cannot be used to access an object of any type.

If the return value compares is greater than or equal to alignof(T), the alignment requirement for the type T is satisfied by the pointer.

A freestanding implementation needs to provide memalignment.

[edit] Parameters p - pointer to query alignment [edit] Return value

The alignment value of p, or â0â if p is a null pointer value.

[edit] Notes

On common platforms where

null pointers are cast to integer â0â,
pointer values are directly cast to the numeric values of virtual addresses, and
size_t is same as uintptr_t,

this function can be implemented as return (size_t)p & -(size_t)p;.

[edit] Example

#include <stdio.h>
#include <stdlib.h>
 
int main()
{
    alignas(128) int i = 0;
    printf("%zu\n%zu\n", memalignment(nullptr), memalignment(&i));
}

Possible output:

[edit] References

C23 standard (ISO/IEC 9899:2024):

7.24.9.1 The memalignment function (p: 374)

[edit] See also

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