...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/use_default.hpp> provides the type boost::use_default
which is used by other Boost
libraries as a sentinel type in a templates to indicate defaults.
template<class Derived, class Base, class Value = boost::use_default, class CategoryOrTraversal = boost::use_default, class Reference = boost::use_default, class Difference = boost::use_default> class iterator_adaptor; template<class Value> class node_iterator : public iterator_adaptor<node_iterator<Value>, Value*, boost::use_default, boost::forward_traversal_tag>;
namespace boost { struct use_default { }; }