RFC: Add operator""_uint256 compile-time user-defined literal
#31991
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_hex to uint256 and remove consteval_ctoroperator""_uint256 compile-time user-defined literal
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Co-authored-by: Hodlinator <172445034+hodlinator@users.noreply.github.com>
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I think the upstream bug link may be wrong. https://developercommunity.visualstudio.com/t/Can-not-initialize-array-with-consteval/10828473 looks closer |
| @@ -88,17 +88,17 @@ class CMainParams : public CChainParams { | |||
| consensus.signet_challenge.clear(); | |||
| consensus.nSubsidyHalvingInterval = 210000; | |||
| consensus.script_flag_exceptions.emplace( // BIP16 exception | |||
| uint256{"00000000000002dc756eebf4f49723ed8d30cc28a5f108eb94b1ba88ac4f9c22"}, SCRIPT_VERIFY_NONE); | |||
| "00000000000002dc756eebf4f49723ed8d30cc28a5f108eb94b1ba88ac4f9c22"_uint256, SCRIPT_VERIFY_NONE); | |||
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Not sure what the goal here is, or the improvement. Looks like extra code is added to do the same thing in two different ways?
Yes, it seems like our issue was closer this "sub-issue" in the currently linked issue: https://developercommunity.visualstudio.com/t/consteval-conversion-function-fails/1579014#T-N10550785 and they apparently only fixed the primary issue. :\ |
Follow-up to Add mainnet assumeutxo param at height 880,000, looking to simplify specifying explicit hashes in the source code.
It's not a full implementation yet, I'm looking for concept ack/nack and full CI feedback for now - applying it to the whole codebase may follow based on that.
This is also a follow-up to refactor: Replace ParseHex with consteval ""_hex literals, meant to simplify the usages (values beginning with the hexadecimal data, followed by the type conversion, similarly to
sizeof(uint256)vsuint256::size()) and unifying hex parsing code.Similarly to
""_hex, the""_uint256has the same compile-time constraints as its constructor (properly sized with actual hexadecimal values), but usesdetail::Hexparser (reversed) (used in most other places for hex parsing) instead ofbase_blob(std::string_view hex_str).The new implementation also makes it obvious that the values are reversed in this case.
I thought of removing the
consteval_ctorhack as well, now that consteval conversion is claimed to work in visual studio, but since https://godbolt.org/z/j837req5h still seems to fail for latestx64 msvc v19, I postponed doing that.