In Olaoluwa Osuntokun's recent protocol proposal they were using a
mod in an inner loop. I wanted to suggest a normative protocol
change to use the trick we use here, but to find an explanation
of it I had to dig up the PR on github. After I posted about it
several other developers commented that it was very interesting
and they were unaware of it.
I think ideally the code should be self documenting and help
educate other contributors about non-obvious techniques that
we use. So I've written a description of the technique with
citations for future reference.
7631066 Use the "domain name setup" image (previously unused) in the gitian docs (practicalswift)
Tree-SHA512: 747f3afa15dd6007076fb20d5fd16e20e2fb920c5eea5557664ddd42bd2c52e1a517124a649e3d1605fcc9e0c06a567c63b1023dda22f813a2d331b28097baa0
3fb81a8 Use list initialization (C++11) for maps/vectors instead of boost::assign::map_list_of/list_of (practicalswift)
Tree-SHA512: 63a9ac9ec5799472943dce1cd92a4b14e7f1fe12758a5fc4b1efceaf2c85a4ba71dad5ccc50813527f18b192e7714c076e2478ecd6ca0d452b24e88416f872f7
246a02f Use std::unordered_{map,set} (C++11) instead of boost::unordered_{map,set} (practicalswift)
Tree-SHA512: 35cd42012248174751e4b87efbc78689957f731d7710dea7e369974c6ec31b15b32d1537fb0d875c94c7ffb5046d9784735e218e5baeed96d525861dab6d4252
227ae9b [tests] Use FastRandomContext instead of boost::random::{mt19937,uniform_int_distribution} (practicalswift)
Tree-SHA512: 1bde6c8b9498051fa2eae4913eb1f5411adea8dea1511c0df859aea57a2a7db6f5839945ddf2eccdddfa322bceacad35a5d875742db7d15e40dbea83185307bb
e94584858 scripted-diff: Use new naming style for insecure_rand* functions (Pieter Wuille)
2fcd9cc86 scripted-diff: Use randbits/bool instead of randrange where possible (Pieter Wuille)
2ada67852 Use randbits instead of ad-hoc emulation in prevector tests (Pieter Wuille)
5f0b04eed Replace rand() & ((1 << N) - 1) with randbits(N) (Pieter Wuille)
3ecabae36 Replace more rand() % NUM by randranges (Pieter Wuille)
efee1db21 scripted-diff: use insecure_rand256/randrange more (Pieter Wuille)
1119927df Add various insecure_rand wrappers for tests (Pieter Wuille)
124d13a58 Merge test_random.h into test_bitcoin.h (Pieter Wuille)
90620d66c scripted-diff: Rename cuckoo tests' local rand context (Pieter Wuille)
37e864eb9 Add FastRandomContext::rand256() and ::randbytes() (Pieter Wuille)
Tree-SHA512: d09705a3ec718ae792f7d66a75401903ba7b9c9d3fc36669d6e3b9242f0194738106be26baefc8a8e3fa6df7c9a35978c71c0c430278a028b331df23a3ea3070
9a5a1d7 RPC/rawtransaction: createrawtransaction: Check opt_into_rbf when provided with either value (Luke Dashjr)
23b0fe3 bitcoin-tx: rbfoptin: Avoid touching nSequence if the value is already opting in (Luke Dashjr)
b005bf2 Introduce MAX_BIP125_RBF_SEQUENCE constant (Luke Dashjr)
575cde4 [bitcoin-tx] add rbfoptin command (Jonas Schnelli)
5d26244 [Tests] extend the replace-by-fee test to cover RPC rawtx features (Jonas Schnelli)
36bcab2 RPC/Wallet: Add RBF support for fundrawtransaction (Luke Dashjr)
891c5ee Wallet: Refactor FundTransaction to accept parameters via CCoinControl (Luke Dashjr)
578ec80 RPC: rawtransaction: Add RBF support for createrawtransaction (Luke Dashjr)
Tree-SHA512: 446e37c617c188cc3b3fd1e2841c98eda6f4869e71cb3249c4a9e54002607d0f1e6bef92187f7894d4e0746ab449cfee89be9f6a1a8831e25c70cf912eac1570
656dbd871 Perform member initialization in initialization lists where possible (practicalswift)
Tree-SHA512: 048380f4da23ab1eaaf471801a01dbd76f2235afb686c1489b30a6bac109195134afc83414b8378d3482a9042d537ec62d30136dadb9347cf06b07fb5c693208
8ad5bde Merge bctest.py into bitcoin-util-test.py (John Newbery)
95836c5 Use shared config file for functional and util tests (John Newbery)
89fcd35 Use an .ini config file for environment vars in bitcoin-util-test.py (John Newbery)
e9265df Change help_text in bitcoin-util-test.py to a docstring. (John Newbery)
ce58e93 Change bitcoin-util-test.py to use Python3 (John Newbery)
Tree-SHA512: 66dab0b4a8546aee0dfaef134a165f1447aff4c0ec335754bbc7d9e55909721c62f09cdbf4b22d02ac1fcd5a9b66780f91e1cc4d8687fae7288cc9072a23a78f
bctest.py is only used as an import by bitcoin-util-test.py. There's no
value in keeping it as a separate module, so let's merge them into a
single module to keep building and packaging simpler.
bitcoin-test-util is importable as a module, so if any future modules
really want to import the code from bctest.py, they can import
bitcoin-test-util and call the bctest functions by name.
24980a3 Make functions in validation.cpp static and pass chainparams (Mario Dian)
Tree-SHA512: 2d1b7b0ffd851317ed522911c1b6592855376c5cbc65d71ec0f8aa507eb6caef21b0709b3692255f1d719662db7447579c10df02f6ef4cd35fcb0bdf2e653af6
Gregory Maxwell