Function GetTransactionWeight

src/consensus/validation.h:147–150

These implement the weight = (stripped_size * 4) + witness_size formula, using only serialization with and without witness data. As witness_size is equal to total_size - stripped_size, this formula is identical to: weight = (stripped_size * 3) + total_size.

// is equal to total_size - stripped_size, this formula is identical to:
// weight = (stripped_size * 3) + total_size.
static inline int64_t GetTransactionWeight(const CTransaction& tx)
{
    return ::GetSerializeSize(tx, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR - 1) + ::GetSerializeSize(tx, PROTOCOL_VERSION);
}
static inline int64_t GetBlockWeight(const CBlock& block)
{
    return ::GetSerializeSize(block, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR - 1) + ::GetSerializeSize(block, PROTOCOL_VERSION);