v4.0.0

Added

• Support for the new Config JSON v6 format: updated the config model and implemented new features in setting evaluation logic.
• Overhaul setting evaluation-related logging and make it consistent across SDKs.
• Improve consistency of config JSON deserialization error reporting.
• Performance improvements to setting evaluation (building of evaluation log is expensive, so it is skipped when info level logging is turned off).

Breaking changes

• ConfigCatClient.get returns std::shared_ptr<ConfigCatClient> instead of raw pointer.
• getValue functions expect const std::shared_ptr<ConfigCatUser>& as user param instead of const raw pointer.
• The generic getValue function returns std::optional<Value> instead of std::shared_ptr<Value>. In case of any failure, std::nullopt will be returned.
• getKeyAndValue function returns std::optional<KeyValue> instead of std::shared_ptr<KeyValue>.
• Hooks callback changes:
  • onError reports the occurred exception with const std::exception_ptr& argument.
  • onFlagEvaluated callback's argument is changed to const EvaluationDetailsBase& from const EvaluationDetails&.
• Renamed RolloutRule to TargetingRule.
• Renamed RolloutPercentageItem to PercentageOption.
• EvaluationDetails changes:
  • matchedEvaluationRule is renamed to matchedTargetingRule.
  • matchedEvaluationPercentageRule is renamed to matchedPercentageOption.
  • Introduced std::exception_ptr errorException.
  • Introduced std::shared_ptr and std::optional types instead of const ref/pointers.
• Introduced ResponseErrorCode instead of bool operationTimedOut in Response struct.
• Logging changes:
  • Log level names are now in capital format to follow other ConfigCat SDKs.
  • The Log function now gets const std::exception_ptr& exception as an argument. unwrap_exception_message function can be used to get the message of this exception.
• The custom init parameter of ConfigCatUser now accepts std::string, double, std::chrono::system_clock::time_point, std::vector<std::string> typed values, not just strings. This allows the usage of various types in the user object's custom attributes.
• Introduced datetime_to_isostring and make_datetime(int year, int month, int day, int hour, int min, int sec, int millisec) helpers in timeutils.h