util.h

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#pragma once
 
#include <bit>
#include <cstddef>
#include <cstdint>
 
namespace emlabcpp::pmr
{
 
constexpr std::uintptr_t align_addr( std::uintptr_t const addr, std::size_t const alignment )
{
        // note: based on tips from sarah@#include discord
        auto const low_bit_mask = alignment - 1;
        return ( addr + low_bit_mask ) & ~low_bit_mask;
}
 
inline void* align( void* const ptr, std::size_t const alignment )
{
        auto const iptr = std::bit_cast< std::uintptr_t >( ptr );
        auto       addr = align_addr( iptr, alignment );
        return static_cast< std::byte* >( ptr ) + ( addr - iptr );
}
 
}  // namespace emlabcpp::pmr