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78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
//
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// Sizes.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 26/01/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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template <int size> struct uint_t_impl;
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template <> struct uint_t_impl<8> { using type = uint8_t; };
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template <> struct uint_t_impl<16> { using type = uint16_t; };
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template <> struct uint_t_impl<32> { using type = uint32_t; };
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template <> struct uint_t_impl<64> { using type = uint64_t; };
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/// Unsigned integer types templated on size; `uint_t<8> = uint8_t`; `uint_t<16> = uint16_t`, etc.
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template <int size> using uint_t = typename uint_t_impl<size>::type;
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/*!
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Maps to the smallest integral type that can contain `max_value`, from the following options:
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* uint8_t;
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* uint16_t;
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* uint32_t; or
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* uint64_t.
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*/
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template <uint64_t max_value>
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struct MinIntForValue {
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using type =
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std::conditional_t<
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max_value <= std::numeric_limits<uint8_t>::max(), uint8_t,
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std::conditional_t<
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max_value <= std::numeric_limits<uint16_t>::max(), uint16_t,
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std::conditional_t<
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max_value <= std::numeric_limits<uint32_t>::max(), uint32_t,
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uint64_t
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>
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>
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>;
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};
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template <uint64_t max_value> using min_int_for_value_t = typename MinIntForValue<max_value>::type;
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/*!
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Maps to the smallest integral type that can hold at least `max_bits` bits, from the following options:
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* uint8_t;
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* uint16_t;
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* uint32_t; or
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* uint64_t.
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*/
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template <int min_bits>
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struct MinIntForBits {
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static_assert(min_bits <= 64, "Only integers up to 64 bits are supported");
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using type =
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std::conditional_t<
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min_bits <= 8, uint8_t,
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std::conditional_t<
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min_bits <= 16, uint16_t,
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std::conditional_t<
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min_bits <= 32, uint32_t,
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uint64_t
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>
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>
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>;
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};
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template <int min_bits> using min_int_for_bits_t = typename MinIntForBits<min_bits>::type;
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static_assert(std::is_same_v<min_int_for_bits_t<7>, uint8_t>);
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static_assert(std::is_same_v<min_int_for_bits_t<8>, uint8_t>);
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static_assert(std::is_same_v<min_int_for_bits_t<9>, uint16_t>);
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static_assert(std::is_same_v<min_int_for_bits_t<16>, uint16_t>);
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static_assert(std::is_same_v<min_int_for_bits_t<17>, uint32_t>);
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