94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
#pragma once
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#include <cstdint>
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#include <iostream>
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#include <iomanip>
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#ifdef __BYTE_ORDER__
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# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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# define HOST_LITTLE_ENDIAN
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# endif
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# if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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# define HOST_BIG_ENDIAN
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# endif
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#else
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# if defined(_M_X64) || defined(_M_IX86)
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# define HOST_LITTLE_ENDIAN
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# else
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# define HOST_BIG_ENDIAN
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# endif
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#endif
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namespace EightBit {
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union register16_t final {
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struct {
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#ifdef HOST_LITTLE_ENDIAN
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uint8_t low;
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uint8_t high;
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#endif
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#ifdef HOST_BIG_ENDIAN
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uint8_t high;
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uint8_t low;
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#endif
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};
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uint16_t word;
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constexpr register16_t() noexcept : word(0) {}
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constexpr register16_t(const uint16_t w) noexcept : word(w) {}
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constexpr register16_t(const uint8_t l, const uint8_t h) noexcept : low(l), high(h) {}
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constexpr auto& operator++() noexcept {
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++word;
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return *this;
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}
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constexpr auto& operator--() noexcept {
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--word;
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return *this;
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}
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constexpr auto operator++(int) noexcept {
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register16_t temporary(*this);
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operator++();
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return temporary;
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}
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constexpr auto operator--(int) noexcept {
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register16_t temporary(*this);
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operator--();
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return temporary;
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}
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constexpr auto& operator+=(const register16_t rhs) noexcept {
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this->word += rhs.word;
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return *this;
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}
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constexpr auto& operator-=(const register16_t rhs) noexcept {
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this->word -= rhs.word;
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return *this;
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}
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[[nodiscard]] constexpr auto operator==(const register16_t& rhs) const noexcept { return word == rhs.word; }
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[[nodiscard]] constexpr auto operator!=(const register16_t& rhs) const noexcept { return word != rhs.word; }
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[[nodiscard]] constexpr auto operator<(const register16_t& rhs) const noexcept { return word < rhs.word; }
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[[nodiscard]] constexpr auto operator<=(const register16_t& rhs) const noexcept { return word <= rhs.word; }
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[[nodiscard]] constexpr auto operator>(const register16_t& rhs) const noexcept { return word > rhs.word; }
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[[nodiscard]] constexpr auto operator>=(const register16_t& rhs) const noexcept { return word >= rhs.word; }
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};
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[[nodiscard]] constexpr inline auto operator+(register16_t lhs, const register16_t rhs) noexcept {
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lhs += rhs;
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return lhs;
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}
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[[nodiscard]] constexpr inline auto operator-(register16_t lhs, const register16_t rhs) noexcept {
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lhs -= rhs;
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return lhs;
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}
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inline auto& operator<<(std::ostream& output, const register16_t value) {
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return output << std::hex << std::setw(4) << std::setfill('0') << value.word;
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}
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}
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