...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
#include <boost/exception/exception.hpp> namespace boost { templateclass error_info { public: typedef T value_type; error_info( value_type const & v ); value_type const & value() const; value_type & value(); }; templateE const & operator<<( E const & x, error_info }const & v );