From cb5052d98fa9a5d64d1700fe434c1c37a72e45d1 Mon Sep 17 00:00:00 2001 From: John Ericson Date: Wed, 17 May 2023 22:04:59 -0400 Subject: Revert "Revert "Use template structs instead of phantoms"" This is the more typically way to do [Argument-dependent lookup](https://en.cppreference.com/w/cpp/language/adl)-leveraging generic serializers in C++. It makes the relationship between the `read` and `write` methods more clear and rigorous, and also looks more familiar to users coming from other languages that do not have C++'s libertine ad-hoc overloading. I am returning to this because during the review in https://github.com/NixOS/nix/pull/6223, it came up as something that would make the code easier to read --- easier today hopefully already, but definitely easier if we were have multiple codified protocols with code sharing between them as that PR seeks to accomplish. If I recall correctly, the main criticism of this the first time around (in 2020) was that having to specify the type when writing, e.g. `WorkerProto::write`, was too verbose and cumbersome. This is now addressed with the `workerProtoWrite` wrapper function. This method is also the way `nlohmann::json`, which we have used for a number of years now, does its serializers, for what its worth. This reverts commit 45a0ed82f089158a79c8c25ef844c55e4a74fc35. That commit in turn reverted 9ab07e99f527d1fa3adfa02839da477a1528d64b. --- src/libstore/export-import.cc | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'src/libstore/export-import.cc') diff --git a/src/libstore/export-import.cc b/src/libstore/export-import.cc index 4eb838b68..5ea263a86 100644 --- a/src/libstore/export-import.cc +++ b/src/libstore/export-import.cc @@ -45,7 +45,7 @@ void Store::exportPath(const StorePath & path, Sink & sink) teeSink << exportMagic << printStorePath(path); - worker_proto::write(*this, teeSink, info->references); + workerProtoWrite(*this, teeSink, info->references); teeSink << (info->deriver ? printStorePath(*info->deriver) : "") << 0; @@ -73,7 +73,7 @@ StorePaths Store::importPaths(Source & source, CheckSigsFlag checkSigs) //Activity act(*logger, lvlInfo, "importing path '%s'", info.path); - auto references = worker_proto::read(*this, source, Phantom {}); + auto references = WorkerProto::read(*this, source); auto deriver = readString(source); auto narHash = hashString(htSHA256, saved.s); -- cgit v1.2.3