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64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
#ifndef COMPONENT_ESM_FORMID_H
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#define COMPONENT_ESM_FORMID_H
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#include <cstdint>
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#include <cstring>
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#include <ostream>
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#include <string>
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#include <tuple>
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namespace ESM
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{
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using FormId32 = uint32_t;
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struct FormId
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{
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uint32_t mIndex = 0;
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int32_t mContentFile = -1;
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constexpr bool hasContentFile() const { return mContentFile >= 0; }
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constexpr bool isSet() const { return mIndex != 0 || mContentFile != -1; }
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// Zero is used in ESM4 as a null reference
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constexpr bool isZeroOrUnset() const { return mIndex == 0 && (mContentFile == 0 || mContentFile == -1); }
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std::string toString(std::string_view prefix = "") const;
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FormId32 toUint32() const;
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static constexpr FormId fromUint32(FormId32 v) { return { v & 0xffffff, static_cast<int32_t>(v >> 24) }; }
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};
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inline constexpr bool operator==(const FormId& left, const FormId& right)
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{
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return left.mIndex == right.mIndex && left.mContentFile == right.mContentFile;
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}
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inline constexpr bool operator<(const FormId& left, const FormId& right)
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{
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return std::tie(left.mIndex, left.mContentFile) < std::tie(right.mIndex, right.mContentFile);
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}
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inline std::ostream& operator<<(std::ostream& stream, const FormId& formId)
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{
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return stream << formId.toString();
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}
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}
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namespace std
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{
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// Needed to use ESM::FormId as a key in std::unordered_map
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template <>
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struct hash<ESM::FormId>
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{
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size_t operator()(const ESM::FormId& formId) const
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{
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static_assert(sizeof(ESM::FormId) == sizeof(size_t));
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size_t s;
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memcpy(&s, &formId, sizeof(size_t));
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return hash<size_t>()(s);
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}
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};
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}
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#endif // COMPONENT_ESM_FORMID_H
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