flag_notifier.hpp

#pragma once
 
#include <launchdarkly/client_side/flag_change_event.hpp>
#include <launchdarkly/connection.hpp>
#include <launchdarkly/value.hpp>
 
#include <functional>
#include <memory>
 
namespace launchdarkly::client_side::flag_manager {
 
class IFlagNotifier {
   public:
    // The FlagValueChangeEvent is in a shared pointer so that all handlers
    // can use the same instance, and the lifetime is tied to how the consumer
    // uses the event.
    using ChangeHandler =
        std::function<void(std::shared_ptr<FlagValueChangeEvent>)>;
 
    virtual std::unique_ptr<IConnection> OnFlagChange(
        std::string const& key,
        ChangeHandler handler) = 0;
 
    virtual ~IFlagNotifier() = default;
    IFlagNotifier(IFlagNotifier const& item) = delete;
    IFlagNotifier(IFlagNotifier&& item) = delete;
    IFlagNotifier& operator=(IFlagNotifier const&) = delete;
    IFlagNotifier& operator=(IFlagNotifier&&) = delete;
 
   protected:
    IFlagNotifier() = default;
};
 
}  // namespace launchdarkly::client_side::flag_manager