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

Struct impl

boost::log::attribute::impl — A base class for an attribute value factory.

Synopsis

// In header: <boost/log/attributes/attribute.hpp>



// A base class for an attribute value factory.

struct impl : public boost::intrusive_ref_counter< impl > {

  // public member functions
  virtual ~impl();
  virtual attribute_value get_value() = 0;

  // public static functions
  static void * operator new(std::size_t);
  static void operator delete(void *, std::size_t) noexcept;
};

Description

All attributes must derive their implementation from this class.

`impl` public member functions

```
virtual ~impl();
```
Virtual destructor.
```
virtual attribute_value get_value() = 0;
```
Returns:

The actual attribute value. It shall not return empty values (exceptions shall be used to indicate errors).

`impl` public static functions

static void * operator new(std::size_t size);

static void operator delete(void * p, std::size_t size) noexcept;