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#ifndef BITCOIN_UTIL_TRANSACTION_IDENTIFIER_H
#define BITCOIN_UTIL_TRANSACTION_IDENTIFIER_H
#include <attributes.h>
#include <uint256.h>
#include <util/types.h>
/** transaction_identifier represents the two canonical transaction identifier
* types (txid, wtxid).*/
template <bool has_witness>
class transaction_identifier
{
uint256 m_wrapped;
// Note: Use FromUint256 externally instead.
transaction_identifier(const uint256& wrapped) : m_wrapped{wrapped} {}
// TODO: Comparisons with uint256 should be disallowed once we have
// converted most of the code to using the new txid types.
constexpr int Compare(const uint256& other) const { return m_wrapped.Compare(other); }
constexpr int Compare(const transaction_identifier<has_witness>& other) const { return m_wrapped.Compare(other.m_wrapped); }
template <typename Other>
constexpr int Compare(const Other& other) const
{
static_assert(ALWAYS_FALSE<Other>, "Forbidden comparison type");
return 0;
}
public:
transaction_identifier() : m_wrapped{} {}
template <typename Other>
bool operator==(const Other& other) const { return Compare(other) == 0; }
template <typename Other>
bool operator!=(const Other& other) const { return Compare(other) != 0; }
template <typename Other>
bool operator<(const Other& other) const { return Compare(other) < 0; }
const uint256& ToUint256() const LIFETIMEBOUND { return m_wrapped; }
static transaction_identifier FromUint256(const uint256& id) { return {id}; }
/** Wrapped `uint256` methods. */
constexpr bool IsNull() const { return m_wrapped.IsNull(); }
constexpr void SetNull() { m_wrapped.SetNull(); }
std::string GetHex() const { return m_wrapped.GetHex(); }
std::string ToString() const { return m_wrapped.ToString(); }
static constexpr auto size() { return decltype(m_wrapped)::size(); }
constexpr const std::byte* data() const { return reinterpret_cast<const std::byte*>(m_wrapped.data()); }
constexpr const std::byte* begin() const { return reinterpret_cast<const std::byte*>(m_wrapped.begin()); }
constexpr const std::byte* end() const { return reinterpret_cast<const std::byte*>(m_wrapped.end()); }
template <typename Stream> void Serialize(Stream& s) const { m_wrapped.Serialize(s); }
template <typename Stream> void Unserialize(Stream& s) { m_wrapped.Unserialize(s); }
/** Conversion function to `uint256`.
*
* Note: new code should use `ToUint256`.
*
* TODO: This should be removed once the majority of the code has switched
* to using the Txid and Wtxid types. Until then it makes for a smoother
* transition to allow this conversion. */
operator const uint256&() const LIFETIMEBOUND { return m_wrapped; }
};
/** Txid commits to all transaction fields except the witness. */
using Txid = transaction_identifier<false>;
/** Wtxid commits to all transaction fields including the witness. */
using Wtxid = transaction_identifier<true>;
inline Txid TxidFromString(std::string_view str)
{
return Txid::FromUint256(uint256S(str.data()));
}
#endif // BITCOIN_UTIL_TRANSACTION_IDENTIFIER_H
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