Boost C++ Libraries

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Class template callback

boost::log::type_dispatcher::callback

Synopsis

// In header: <boost/log/utility/type_dispatch/type_dispatcher.hpp>


template<typename T> 
class callback {
public:

  // public member functions
  void operator()(T const &) const;
  bool operator!() const;
};

Description

This interface is used by type dispatchers to consume the dispatched value.

`callback` public member functions

```
void operator()(T const & value) const;
```
The operator invokes the visitor-specific logic with the given value

Parameters:

value

The dispatched value
```
bool operator!() const;
```
The operator checks if the visitor is attached to a receiver

The operator checks if the visitor is not attached to a receiver