Class template mutable_constant<T, void, void, void>

Boost C++ Libraries

Class template mutable_constant<T, void, void, void>

boost::log::attributes::mutable_constant<T, void, void, void> — Specialization for unlocked case.

Synopsis

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

template<typename T> 
class mutable_constant<T, void, void, void> : public attribute {
public:
  // types
  typedef void mutex_type;         // Mutex type. 
  typedef void scoped_read_lock;   // Shared lock type. 
  typedef void scoped_write_lock;  // Exclusive lock type. 
  typedef T    held_type;          // A held constant type. 

  // public member functions
   mutable_constant(held_type const &);
  shared_ptr< attribute_value > get_value();
  void set_value(held_type const &);
};

Description

This version of attribute does not perform thread synchronization to access the stored value.

`mutable_constant` public member functions

```
 mutable_constant(held_type const & value);
```
Constructor with the stored value initialization
```
shared_ptr< attribute_value > get_value();
```
Returns:
The actual attribute value. It shall not return NULL (exceptions shall be used to indicate errors).
```
void set_value(held_type const & v);
```
The method sets a new attribute value.