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https://github.com/MoleskiCoder/EightBit.git
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80 lines
1.5 KiB
C++
80 lines
1.5 KiB
C++
#pragma once
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#include <cstdint>
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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 {
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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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register16_t() noexcept : word(0) {}
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register16_t(uint16_t w) noexcept : word(w) {}
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register16_t(uint8_t l, uint8_t h) noexcept : low(l), high(h) {}
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register16_t& operator++() noexcept {
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++word;
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return *this;
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}
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register16_t& operator--() noexcept {
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--word;
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return *this;
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}
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register16_t 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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register16_t 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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register16_t& 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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register16_t& 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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};
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inline register16_t 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 register16_t 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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}
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