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txgraph: pass fallback_order to TxGraph (preparation)

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This adds an std::function<strong_ordering(Ref&,Ref&)> argument to the
MakeTxGraph function, which can be used by the caller (e.g., mempool
code) to provide a fallback order to TxGraph.

This is just preparation; TxGraph does not yet use this fallback order
for anything.
This commit is contained in:
Pieter Wuille
2026-01-08 15:17:28 -05:00
parent 941c432a46
commit fba004a3df
7 changed files with 100 additions and 23 deletions
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10
src/txmempool.cpp
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@@ -176,7 +176,15 @@ static CTxMemPool::Options&& Flatten(CTxMemPool::Options&& opts, bilingual_str&
CTxMemPool::CTxMemPool(Options opts, bilingual_str& error)
: m_opts{Flatten(std::move(opts), error)}
{
m_txgraph = MakeTxGraph(m_opts.limits.cluster_count, m_opts.limits.cluster_size_vbytes * WITNESS_SCALE_FACTOR, ACCEPTABLE_ITERS);
m_txgraph = MakeTxGraph(
/*max_cluster_count=*/m_opts.limits.cluster_count,
/*max_cluster_size=*/m_opts.limits.cluster_size_vbytes * WITNESS_SCALE_FACTOR,
/*acceptable_iters=*/ACCEPTABLE_ITERS,
/*fallback_order=*/[&](const TxGraph::Ref& a, const TxGraph::Ref& b) noexcept {
const Txid& txid_a = static_cast<const CTxMemPoolEntry&>(a).GetTx().GetHash();
const Txid& txid_b = static_cast<const CTxMemPoolEntry&>(b).GetTx().GetHash();
return txid_a <=> txid_b;
});
}
bool CTxMemPool::isSpent(const COutPoint& outpoint) const