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Use more std::visit to prepare for new variant

Browse source 
N.B. not using `std::visit` for fetchurl because there is no attempt to
handle all the cases (e.g. no `else`) and lambda complicates early
return.
This commit is contained in:
John Ericson 2020-07-12 16:12:21 +00:00
parent ffc18583b1
commit fedfc913ad
3 changed files with 32 additions and 18 deletions
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32
src/libstore/derivations.cc
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@ -283,13 +283,16 @@ string Derivation::unparse(const Store & store, bool maskOutputs,
if (first) first = false; else s += ',';
s += '('; printUnquotedString(s, i.first);
s += ','; printUnquotedString(s, maskOutputs ? "" : store.printStorePath(i.second.path(store, name)));
if (auto hash = std::get_if<DerivationOutputFixed>(&i.second.output)) {
s += ','; printUnquotedString(s, hash->hash.printMethodAlgo());
s += ','; printUnquotedString(s, hash->hash.hash.to_string(Base16, false));
} else {
s += ','; printUnquotedString(s, "");
s += ','; printUnquotedString(s, "");
}
std::visit(overloaded {
[&](DerivationOutputInputAddressed doi) {
s += ','; printUnquotedString(s, "");
s += ','; printUnquotedString(s, "");
},
[&](DerivationOutputFixed dof) {
s += ','; printUnquotedString(s, dof.hash.printMethodAlgo());
s += ','; printUnquotedString(s, dof.hash.hash.to_string(Base16, false));
},
}, i.second.output);
s += ')';
}
@ -503,12 +506,15 @@ void writeDerivation(Sink & out, const Store & store, const BasicDerivation & dr
for (auto & i : drv.outputs) {
out << i.first
<< store.printStorePath(i.second.path(store, drv.name));
if (auto hash = std::get_if<DerivationOutputFixed>(&i.second.output)) {
out << hash->hash.printMethodAlgo()
<< hash->hash.hash.to_string(Base16, false);
} else {
out << "" << "";
}
std::visit(overloaded {
[&](DerivationOutputInputAddressed doi) {
out << "" << "";
},
[&](DerivationOutputFixed dof) {
out << dof.hash.printMethodAlgo()
<< dof.hash.hash.to_string(Base16, false);
},
}, i.second.output);
}
writeStorePaths(store, out, drv.inputSrcs);
out << drv.platform << drv.builder << drv.args;