diff options
Diffstat (limited to 'include/erebos/storage.h')
| -rw-r--r-- | include/erebos/storage.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/erebos/storage.h b/include/erebos/storage.h index 34ed9df..29eaa8f 100644 --- a/include/erebos/storage.h +++ b/include/erebos/storage.h @@ -107,6 +107,7 @@ protected: static UUID storeHead(UUID type, const Ref & ref); static bool replaceHead(UUID type, UUID id, const Ref & old, const Ref & ref); static std::optional<Ref> updateHead(UUID type, UUID id, const Ref & old, const std::function<Ref(const Ref &)> &); + void watchHead(UUID type, UUID id, const std::function<void(const Ref &)>) const; }; class Digest @@ -482,6 +483,7 @@ public: const Ref & ref() const { return mstored.ref(); } std::optional<Head<T>> update(const std::function<Stored<T>(const Stored<T> &)> &) const; + void watch(const std::function<void(const Head<T> &)> &) const; private: UUID mid; @@ -536,6 +538,14 @@ std::optional<Head<T>> Head<T>::update(const std::function<Stored<T>(const Store return Head<T>(mid, *res); } +template<typename T> +void Head<T>::watch(const std::function<void(const Head<T> &)> & watcher) const +{ + stored().ref().storage().watchHead(T::headTypeId, id(), [id = id(), watcher] (const Ref & ref) { + watcher(Head<T>(id, ref)); + }); +} + } namespace std |