yy_int_util.h

/*

  MIT License

  Copyright (c) 2024-2025 Yafiyogi

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
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  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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*/

#pragma once

#include <cstddef>
#include <cstdint>

#include <limits>

namespace yafiyogi::yy_util {
namespace digits_detail {

template<std::size_t num>
struct DigitsHelper final
{
    static constexpr const uint64_t digits = 1 + DigitsHelper<num / 10>::digits;
};

template<>
struct DigitsHelper<0> final
{
    static constexpr const uint64_t digits = 0;
};

} // namespace digits_detail

template<typename I>
struct Digits final
{
    static constexpr const uint64_t digits = digits_detail::DigitsHelper<std::numeric_limits<I>::max()>::digits;
};

} // namespace yafiyogi::yy_util