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Add virtual size and weight constexpr utils. #1787

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Merged
evoskuil merged 1 commit into from
Feb 25, 2026
Merged

Add virtual size and weight constexpr utils. #1787

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18 changes: 18 additions & 0 deletions include/bitcoin/system/chain/enums/magic_numbers.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
#define LIBBITCOIN_SYSTEM_CHAIN_ENUMS_MAGIC_NUMBERS_HPP

#include <bitcoin/system/define.hpp>
#include <bitcoin/system/math/math.hpp>

namespace libbitcoin {
namespace system {
Expand Down Expand Up @@ -98,6 +99,23 @@ constexpr uint8_t tapscript_version = 0b1100'0000; // 0xc0

constexpr size_t max_null_data_size = 80;

/// Utilities.
/// ---------------------------------------------------------------------------

constexpr size_t weighted_size(size_t nominal, size_t witnessed) NOEXCEPT
{
return ceilinged_add(
ceilinged_multiply(base_size_contribution, nominal),
ceilinged_multiply(total_size_contribution, witnessed));
}

constexpr size_t virtual_size(size_t nominal, size_t witnessed) NOEXCEPT
{
// Block weight is 3 * nominal size * + 1 * witness size [bip141].
constexpr auto scale = base_size_contribution + total_size_contribution;
return ceilinged_divide(weighted_size(nominal, witnessed), scale);
}

} // namespace chain
} // namespace system
} // namespace libbitcoin
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