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string2Int(): Return std::optional

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This commit is contained in:
Eelco Dolstra 2021-01-08 12:22:21 +01:00
parent 29a445840a
commit 6548b89cc4
17 changed files with 82 additions and 69 deletions
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19
src/nix-env/nix-env.cc
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@ -1250,11 +1250,10 @@ static void opSwitchGeneration(Globals & globals, Strings opFlags, Strings opArg
if (opArgs.size() != 1)
throw UsageError("exactly one argument expected");
GenerationNumber dstGen;
if (!string2Int(opArgs.front(), dstGen))
if (auto dstGen = string2Int<GenerationNumber>(opArgs.front()))
switchGeneration(globals, *dstGen);
else
throw UsageError("expected a generation number");
switchGeneration(globals, dstGen);
}
@ -1308,17 +1307,17 @@ static void opDeleteGenerations(Globals & globals, Strings opFlags, Strings opAr
if(opArgs.front().size() < 2)
throw Error("invalid number of generations ‘%1%’", opArgs.front());
string str_max = string(opArgs.front(), 1, opArgs.front().size());
GenerationNumber max;
if (!string2Int(str_max, max) || max == 0)
auto max = string2Int<GenerationNumber>(str_max);
if (!max || *max == 0)
throw Error("invalid number of generations to keep ‘%1%’", opArgs.front());
deleteGenerationsGreaterThan(globals.profile, max, globals.dryRun);
deleteGenerationsGreaterThan(globals.profile, *max, globals.dryRun);
} else {
std::set<GenerationNumber> gens;
for (auto & i : opArgs) {
GenerationNumber n;
if (!string2Int(i, n))
if (auto n = string2Int<GenerationNumber>(i))
gens.insert(*n);
else
throw UsageError("invalid generation number '%1%'", i);
gens.insert(n);
}
deleteGenerations(globals.profile, gens, globals.dryRun);
}