Function IsChildWithParents

src/policy/packages.cpp:64–79

}

bool IsChildWithParents(const Package& package)
{
    assert(std::all_of(package.cbegin(), package.cend(), [](const auto& tx){return tx != nullptr;}));
    if (package.size() < 2) return false;

    // The package is expected to be sorted, so the last transaction is the child.
    const auto& child = package.back();
    std::unordered_set<uint256, SaltedTxidHasher> input_txids;
    std::transform(child->vin.cbegin(), child->vin.cend(),
                   std::inserter(input_txids, input_txids.end()),
                   [](const auto& input) { return input.prevout.hash; });

    // Every transaction must be a parent of the last transaction in the package.
    return std::all_of(package.cbegin(), package.cend() - 1,
                       [&input_txids](const auto& ptx) { return input_txids.count(ptx->GetHash()) > 0; });
}