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1 : : #ifndef BITCOIN_UTIL_TRANSACTION_IDENTIFIER_H
2 : : #define BITCOIN_UTIL_TRANSACTION_IDENTIFIER_H
3 : :
4 : : #include <attributes.h>
5 : : #include <uint256.h>
6 : : #include <util/types.h>
7 : :
8 : : /** transaction_identifier represents the two canonical transaction identifier
9 : : * types (txid, wtxid).*/
10 : : template <bool has_witness>
11 : : class transaction_identifier
12 : : {
13 : : uint256 m_wrapped;
14 : :
15 : : // Note: Use FromUint256 externally instead.
16 : 26518805 : transaction_identifier(const uint256& wrapped) : m_wrapped{wrapped} {}
17 : :
18 : : // TODO: Comparisons with uint256 should be disallowed once we have
19 : : // converted most of the code to using the new txid types.
20 : 0 : constexpr int Compare(const uint256& other) const { return m_wrapped.Compare(other); }
21 : 3338528740 : constexpr int Compare(const transaction_identifier<has_witness>& other) const { return m_wrapped.Compare(other.m_wrapped); }
22 : : template <typename Other>
23 : : constexpr int Compare(const Other& other) const
24 : : {
25 : : static_assert(ALWAYS_FALSE<Other>, "Forbidden comparison type");
26 : : return 0;
27 : : }
28 : :
29 : : public:
30 [ + - + - : 31185377 : transaction_identifier() : m_wrapped{} {}
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31 : :
32 : : template <typename Other>
33 [ + + ][ + - : 112199597 : bool operator==(const Other& other) const { return Compare(other) == 0; }
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34 : : template <typename Other>
35 [ - - + - : 3899655 : bool operator!=(const Other& other) const { return Compare(other) != 0; }
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36 : : template <typename Other>
37 [ + + + + ]: 2369617508 : bool operator<(const Other& other) const { return Compare(other) < 0; }
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38 : :
39 [ + - + - : 6133509 : const uint256& ToUint256() const LIFETIMEBOUND { return m_wrapped; }
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40 [ + + ][ - - : 19567375 : static transaction_identifier FromUint256(const uint256& id) { return {id}; }
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41 : :
42 : : /** Wrapped `uint256` methods. */
43 [ + + ]: 17404494 : constexpr bool IsNull() const { return m_wrapped.IsNull(); }
44 [ + - ]: 164566 : constexpr void SetNull() { m_wrapped.SetNull(); }
45 : 24 : static std::optional<transaction_identifier> FromHex(std::string_view hex)
46 : : {
47 [ - + ]: 24 : auto u{uint256::FromHex(hex)};
48 [ - + ]: 24 : if (!u) return std::nullopt;
49 : 24 : return FromUint256(*u);
50 : : }
51 [ + - ]: 85071 : std::string GetHex() const { return m_wrapped.GetHex(); }
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52 [ + - ][ + - : 4106827 : std::string ToString() const { return m_wrapped.ToString(); }
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53 : : static constexpr auto size() { return decltype(m_wrapped)::size(); }
54 : : constexpr const std::byte* data() const { return reinterpret_cast<const std::byte*>(m_wrapped.data()); }
55 : 244506 : constexpr const std::byte* begin() const { return reinterpret_cast<const std::byte*>(m_wrapped.begin()); }
56 : 1446 : constexpr const std::byte* end() const { return reinterpret_cast<const std::byte*>(m_wrapped.end()); }
57 : 945032494 : template <typename Stream> void Serialize(Stream& s) const { m_wrapped.Serialize(s); }
58 : 8407935 : template <typename Stream> void Unserialize(Stream& s) { m_wrapped.Unserialize(s); }
59 : :
60 : : /** Conversion function to `uint256`.
61 : : *
62 : : * Note: new code should use `ToUint256`.
63 : : *
64 : : * TODO: This should be removed once the majority of the code has switched
65 : : * to using the Txid and Wtxid types. Until then it makes for a smoother
66 : : * transition to allow this conversion. */
67 [ + - ][ + - : 255303850 : operator const uint256&() const LIFETIMEBOUND { return m_wrapped; }
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68 : : };
69 : :
70 : : /** Txid commits to all transaction fields except the witness. */
71 : : using Txid = transaction_identifier<false>;
72 : : /** Wtxid commits to all transaction fields including the witness. */
73 : : using Wtxid = transaction_identifier<true>;
74 : :
75 : : #endif // BITCOIN_UTIL_TRANSACTION_IDENTIFIER_H
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