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move strings in derivationStrict

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the temporary will be discarded anyway, so we can move out of it and save many
small allocations and copies.
This commit is contained in:
pennae 2022-01-02 00:30:57 +01:00
parent ef45787aae
commit 6401e443a4
1 changed files with 4 additions and 4 deletions
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8
src/libexpr/primops.cc
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@ -1079,10 +1079,10 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
} else { } else {
auto s = state.coerceToString(*i->pos, *i->value, context, true); auto s = state.coerceToString(*i->pos, *i->value, context, true);
drv.env.emplace(key, s); drv.env.emplace(key, s);
if (i->name == state.sBuilder) drv.builder = s; if (i->name == state.sBuilder) drv.builder = std::move(s);
else if (i->name == state.sSystem) drv.platform = s; else if (i->name == state.sSystem) drv.platform = std::move(s);
else if (i->name == state.sOutputHash) outputHash = s; else if (i->name == state.sOutputHash) outputHash = std::move(s);
else if (i->name == state.sOutputHashAlgo) outputHashAlgo = s; else if (i->name == state.sOutputHashAlgo) outputHashAlgo = std::move(s);
else if (i->name == state.sOutputHashMode) handleHashMode(s); else if (i->name == state.sOutputHashMode) handleHashMode(s);
else if (i->name == state.sOutputs) else if (i->name == state.sOutputs)
handleOutputs(tokenizeString<Strings>(s)); handleOutputs(tokenizeString<Strings>(s));