From d127f9bd0e7b9b2e0df2de8a2227f77c0907468d Mon Sep 17 00:00:00 2001 From: Vincent Ambo Date: Wed, 18 May 2022 17:39:39 +0200 Subject: chore(3p/nix): unvendor tvix 0.1 Nothing is using this now, and we'll likely never pick this up again, but we learned a lot in the process. Every now and then this breaks in some bizarre way on channel bumps and it's just a waste of time to maintain that. Change-Id: Idcf2f5acd4ca7070ce18d7149cbfc0d967dc0a44 Reviewed-on: https://cl.tvl.fyi/c/depot/+/5632 Tested-by: BuildkiteCI Reviewed-by: sterni Reviewed-by: lukegb Autosubmit: tazjin --- third_party/nix/src/libutil/lazy.hh | 45 ------------------------------------- 1 file changed, 45 deletions(-) delete mode 100644 third_party/nix/src/libutil/lazy.hh (limited to 'third_party/nix/src/libutil/lazy.hh') diff --git a/third_party/nix/src/libutil/lazy.hh b/third_party/nix/src/libutil/lazy.hh deleted file mode 100644 index 5c6ff5d8df..0000000000 --- a/third_party/nix/src/libutil/lazy.hh +++ /dev/null @@ -1,45 +0,0 @@ -#include -#include -#include - -namespace nix { - -/* A helper class for lazily-initialized variables. - - Lazy var([]() { return value; }); - - declares a variable of type T that is initialized to 'value' (in a - thread-safe way) on first use, that is, when var() is first - called. If the initialiser code throws an exception, then all - subsequent calls to var() will rethrow that exception. */ -template -class Lazy { - typedef std::function Init; - - Init init; - - std::once_flag done; - - T value; - - std::exception_ptr ex; - - public: - explicit Lazy(Init init) : init(init) {} - - const T& operator()() { - std::call_once(done, [&]() { - try { - value = init(); - } catch (...) { - ex = std::current_exception(); - } - }); - if (ex) { - std::rethrow_exception(ex); - } - return value; - } -}; - -} // namespace nix -- cgit 1.4.1