Method ModifyCoins

src/coins.cpp:138–165

}

CCoinsModifier CCoinsViewCache::ModifyCoins(const uint256& txid)
{
    assert(!hasModifier);
    std::pair<CCoinsMap::iterator, bool> ret = cacheCoins.insert(std::make_pair(txid, CCoinsCacheEntry()));
    size_t cachedCoinUsage = 0;
    if (ret.second) {
        if (!base->GetCoins(txid, ret.first->second.coins)) {
            // The parent view does not have this entry; mark it as fresh.
            ret.first->second.coins.Clear();
            // New coins must not already exist.
            if (!ret.first->second.coins.IsPruned())
                throw std::logic_error("ModifyCoins should not find pre-existing coins on a non-coinbase unless they are pruned!");

            if (!(ret.first->second.flags & CCoinsCacheEntry::FRESH)) {
                // If the coin is known to be pruned (have no unspent outputs) in
                // the current view and the cache entry is not dirty, we know the
                // coin also must be pruned in the parent view as well, so it is safe
                // to mark this fresh.
                ret.first->second.flags |= CCoinsCacheEntry::FRESH;
            }
        }
    } else {
        cachedCoinUsage = ret.first->second.coins.DynamicMemoryUsage();
    }
    // Assume that whenever ModifyCoins is called, the entry will be modified.
    ret.first->second.flags |= CCoinsCacheEntry::DIRTY;
    return CCoinsModifier(*this, ret.first, cachedCoinUsage);
}

CCoinsModifier CCoinsViewCache::ModifyNewCoins(const uint256 &txid, bool coinbase) {
    assert(!hasModifier);