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Add dummy Listener without assigned bus

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Thanks to that we can store Listener without ASAP initialization with bus
This commit is contained in:
Dawid Drozd 2019-09-14 14:59:40 +02:00
parent 48306cfc96
commit caa2b3e9ff
1 changed files with 24 additions and 5 deletions
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29
lib/include/dexode/eventbus/Listener.hpp
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@ -11,7 +11,9 @@ template <class Bus>
class Listener
{
public:
Listener(Bus& bus)
explicit Listener() = default; // Dummy listener
explicit Listener(Bus& bus)
: _id{bus.newListenerID()}
, _bus{&bus}
{}
@ -43,8 +45,10 @@ public:
return *this;
}
unlistenAll();
if(_bus != nullptr)
{
unlistenAll();
}
_id = other._id;
other._id = 0;
_bus = other._bus;
@ -56,6 +60,10 @@ public:
template <class Event>
void listen(std::function<void(const Event&)>&& callback)
{
if(_bus == nullptr)
{
throw std::runtime_error{"bus is null"};
}
_bus->template listen<Event>(_id,
std::forward<std::function<void(const Event&)>>(callback));
}
@ -63,24 +71,35 @@ public:
template <class Event>
void listen(const std::function<void(const Event&)>& callback)
{
if(_bus == nullptr)
{
throw std::runtime_error{"bus is null"};
}
_bus->template listen<Event>(_id, callback);
}
void unlistenAll()
{
if(_bus == nullptr)
{
throw std::runtime_error{"bus is null"};
}
_bus->unlistenAll(_id);
}
template <typename Event>
void unlisten()
{
if(_bus == nullptr)
{
throw std::runtime_error{"bus is null"};
}
_bus->template unlisten<Event>(_id);
}
private:
std::uint32_t _id = 0;
Bus* _bus;
Bus* _bus = nullptr;
};
} // namespace dexode::eventbus