Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is an older version of Boost and was released in 2020. The current version is 1.89.0.

Class slot_base

Class slot_base

boost::signals2::slot_base — Base class for slots.

Synopsis

// In header: <boost/signals2/slot_base.hpp>


class slot_base {
public:
  // types
  typedef std::vector<implementation-detail> locked_container_type;

  // tracking
  bool expired() const;
  locked_container_type lock() const;
};

Description

`slot_base` tracking

```
bool expired() const;
```
Returns:

true if any tracked object has expired.

locked_container_type lock() const;

Returns:	A container holding `shared_ptr`s to each of the slot's tracked objects. As long as the returned container is kept in scope, none of the slot's tracked objects can expire.
Throws:	expired_slot if any of the slot's tracked objects have expired.