wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-06-28 17:51:15 +02:00
Code Activity

std::visit by reference

Browse source 
I had started the trend of doing `std::visit` by value (because a type
error once mislead me into thinking that was the only form that
existed). While the optomizer in principle should be able to deal with
extra coppying or extra indirection once the lambdas inlined, sticking
with by reference is the conventional default. I hope this might even
improve performance.
This commit is contained in:
John Ericson 2021-09-30 21:31:21 +00:00
parent 6a8d6246f6
commit 242f9bf3dc
19 changed files with 88 additions and 88 deletions
Download patch file Download diff file Expand all files Collapse all files

4
src/libstore/daemon.cc
View file

@ -395,13 +395,13 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
FramedSource source(from);
// TODO this is essentially RemoteStore::addCAToStore. Move it up to Store.
return std::visit(overloaded {
[&](TextHashMethod &_) {
[&](TextHashMethod &) {
// We could stream this by changing Store
std::string contents = source.drain();
auto path = store->addTextToStore(name, contents, refs, repair);
return store->queryPathInfo(path);
},
[&](FixedOutputHashMethod &fohm) {
[&](FixedOutputHashMethod & fohm) {
if (!refs.empty())
throw UnimplementedError("cannot yet have refs with flat or nar-hashed data");
auto path = store->addToStoreFromDump(source, name, fohm.fileIngestionMethod, fohm.hashType, repair);