ExternalService

template<class T>
class ExternalService : public sb::di::IServiceInstance

Public Types

using Ptr = std::unique_ptr<ExternalService<T>>

Public Functions

inline ExternalService(T *service)

ExternalService(const ExternalService&) = default

ExternalService(ExternalService&&) = default

ExternalService &operator=(const ExternalService&) = default

ExternalService &operator=(ExternalService&&) = default

inline virtual void *get() const final

Returns service pointner as void *.

inline virtual void *moveOut()

Moves out service pointner from instance as void *.

If instance is owner of service it will release this ownership just like std::unique_ptr<T>::release(), otherwise it will throw exception

Warning

Using this method might couse memory leaks, client is responsible for managing this pointner lifetime, the best approach is to imediatly wrap this poinrner with proper std::unique_ptr<T>

std::unique_ptr<T> service{static_cast<T *>(instance->moveOut())};

Throws:

CannotMoveOutServiceException – cannot move out service

inline virtual TypeId getTypeId() const final

Get the TypeId of service.

This method can be used to check if casting is safe

if(instance->getTypeId() == typeid(T)) {
     T* service = instance->getAs<T>();
}

inline virtual bool isValid() const final

Checks if service instance is valid.

If service instance is invalid, get and move methods might lead to undefined behaviour

inline operator bool() const