mem_info.hxx

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#pragma once
#include <ice/mem_align.hxx>
#include <ice/mem_size_types.hxx>
 
namespace ice
{
 
    template<typename T>
    constexpr ice::usize size_of = { sizeof(T) };
 
    template<typename T>
    constexpr ice::ualign align_of = static_cast<ice::ualign>(alignof(T));
 
    template<typename T>
    constexpr ice::meminfo meminfo_of = { ice::size_of<T>, ice::align_of<T> };

    constexpr auto operator*(ice::meminfo info, ice::u64 count) noexcept -> ice::meminfo
    {
        return ice::meminfo{ .size = ice::usize{ info.size.value * count }, .alignment = info.alignment };
    }

    constexpr auto operator+=(ice::meminfo& left, ice::meminfo right) noexcept -> ice::usize
    {
        // Align first
        ice::AlignResult const res = ice::align_to(left.size, right.alignment);
        left.size = res.value;
 
        ice::usize const result = left.size;
        // The following line is commented out on purpose.
        //   We need to keep the original alignment so any allocation made
        //   will mimic all the added meminfo values and respect their offsets.
        // left.alignment = right.alignment; // DON'T SET THIS
        left.size += right.size;
        return result;
    }
 
} // namespace ice