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
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
The header <boost/core/noncopyable.hpp>
defines the class boost::noncopyable. It is intended to be used
as a private base class. boost::noncopyable
has private (under C++03) or deleted (under C++11) copy constructor and a
copy assignment operator and can't be copied or assigned; a class that derives
from it inherits these properties.
boost::noncopyable was originally contributed
by Dave Abrahams.
namespace boost { class noncopyable; }
#include <boost/core/noncopyable.hpp> class X: private boost::noncopyable { };
Class noncopyable has protected constructor and destructor members to emphasize that it is to be used only as a base class. Dave Abrahams notes concern about the effect on compiler optimization of adding (even trivial inline) destructor declarations. He says:
“Probably this concern is misplaced, because noncopyable
will be used mostly for classes which own resources and thus have non-trivial
destruction semantics.”
With C++2011, using an optimized and trivial constructor and similar destructor
can be enforced by declaring both and marking them default.
This is done in the current implementation.