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# Observers
## Usage
Observers are a small framework that allow users to attach code to the execution of SimpleNets and Operators.
An example of an Observer is the `TimeObserver`, used as follows:
### C++
```
unique_ptr<TimeObserver<NetBase>> net_ob =
make_unique<TimeObserver<NetBase>>(net.get());
auto* ob = net->AddObserver(std::move(net_ob));
net->Run();
LOG(INFO) << "av time children: " << ob->average_time_children();
LOG(INFO) << "av time: " << ob->average_time();
```
### Python
```
model.net.AddTimeObserver()
ws.RunNet(model.net)
ob = model.net.GetObserver()
print("av time children:", ob.average_time_children())
print("av time:", ob.average_time())
```
## Implementing An Observer
To implement an observer you must inherit from `ObserverBase` and implement the `Start` and `Stop` functions.
Observers are instantiated with a `subject` of a generic type, such as a `Net` or `Operator`. The observer framework is built to be generic enough to "observe" various other types, however.
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