1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2021 The Limenka developers
3 // Distributed under the MIT software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 6 #ifndef LIMENKA_CONSENSUS_AMOUNT_H
7 #define LIMENKA_CONSENSUS_AMOUNT_H
8 9 #include <cstdint>
10 11 /** Amount in satoshis (Can be negative).
12 * Using __int128 to provide 64 extra bits of sub-satoshi precision,
13 * futureproofing against fiat inflation for the foreseeable future.
14 * COIN = 10^-8 BTC is unchanged; the extra bits sit below satoshis. */
15 typedef __int128 CAmount;
16 17 /** The amount of satoshis in one BTC. */
18 static constexpr CAmount COIN = 100000000;
19 20 /** Attosats per satoshi (10^-18 = 18 decimals of sub-satoshi precision).
21 * CT committed values and the CT kernel fee use attosat units. */
22 static constexpr CAmount ATTOSATS_PER_SATOSHI = 1000000000000000000;
23 24 /** No amount larger than this (in satoshi) is valid.
25 *
26 * Note that this constant is *not* the total money supply, which in Limenka
27 * currently happens to be less than 21,000,000 BTC for various reasons, but
28 * rather a sanity check. As this sanity check is used by consensus-critical
29 * validation code, the exact value of the MAX_MONEY constant is consensus
30 * critical; in unusual circumstances like a(nother) overflow bug that allowed
31 * for the creation of coins out of thin air modification could lead to a fork.
32 * */
33 static constexpr CAmount MAX_MONEY = 21000000 * COIN;
34 inline bool MoneyRange(const CAmount& nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
35 36 #include <ostream>
37 38 /** Stream insertion for __int128 (not provided by standard library). */
39 inline std::ostream& operator<<(std::ostream& os, const __int128& n) {
40 __int128 abs_n = n;
41 if (abs_n < 0) { os << '-'; abs_n = -abs_n; }
42 char buf[40]; int p = sizeof(buf);
43 do { buf[--p] = '0' + static_cast<int>(abs_n % 10); abs_n /= 10; } while (abs_n > 0);
44 return os.write(buf + p, sizeof(buf) - p);
45 }
46 47 #endif // LIMENKA_CONSENSUS_AMOUNT_H
48