diff options
Diffstat (limited to 'src/libutil/experimental-features.cc')
| -rw-r--r-- | src/libutil/experimental-features.cc | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/src/libutil/experimental-features.cc b/src/libutil/experimental-features.cc index d1235d8a4..b49f47e1d 100644 --- a/src/libutil/experimental-features.cc +++ b/src/libutil/experimental-features.cc @@ -1,4 +1,6 @@ #include "experimental-features.hh" +#include "util.hh" + #include "nlohmann/json.hpp" namespace nix { @@ -14,17 +16,19 @@ std::map<ExperimentalFeature, std::string> stringifiedXpFeatures = { const std::optional<ExperimentalFeature> parseExperimentalFeature(const std::string_view & name) { using ReverseXpMap = std::map<std::string_view, ExperimentalFeature>; - static ReverseXpMap * reverseXpMap; - if (!reverseXpMap) { - reverseXpMap = new ReverseXpMap{}; + + static auto reverseXpMap = []() + { + auto reverseXpMap = std::make_unique<ReverseXpMap>(); for (auto & [feature, name] : stringifiedXpFeatures) (*reverseXpMap)[name] = feature; - } + return reverseXpMap; + }(); - auto featureIter = reverseXpMap->find(name); - if (featureIter == reverseXpMap->end()) + if (auto feature = get(*reverseXpMap, name)) + return *feature; + else return std::nullopt; - return {featureIter->second}; } std::string_view showExperimentalFeature(const ExperimentalFeature feature) @@ -45,7 +49,7 @@ std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> & rawFea MissingExperimentalFeature::MissingExperimentalFeature(ExperimentalFeature feature) : Error("experimental Nix feature '%1%' is disabled; use '--extra-experimental-features %1%' to override", showExperimentalFeature(feature)) , missingFeature(feature) - {} +{} std::ostream & operator <<(std::ostream & str, const ExperimentalFeature & feature) { |