From 37264ed0ad898cdd6880de8ce6e5dda7977eed5f Mon Sep 17 00:00:00 2001 From: Tuomas Tynkkynen Date: Fri, 16 Feb 2018 05:13:39 +0200 Subject: [PATCH] libexpr: Avoid an unnecessary string copy in prim_derivationStrict --- src/libexpr/primops.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc index f6c34d525..a800d2429 100644 --- a/src/libexpr/primops.cc +++ b/src/libexpr/primops.cc @@ -553,7 +553,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * * for (auto & i : args[0]->attrs->lexicographicOrder()) { if (i->name == state.sIgnoreNulls) continue; - string key = i->name; + const string & key = i->name; vomit("processing attribute '%1%'", key); auto handleHashMode = [&](const std::string & s) {