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

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Boost Exception

errinfo_nested_exception

#include <boost/exception/errinfo_nested_exception.hpp>

#include <boost/exception/error_info.hpp>

namespace
boost
    {
    typedef ---unspecified--- exception_ptr;
    typedef error_info<struct errinfo_nested_exception_,exception_ptr> errinfo_nested_exception;
    }

This type is designed to be used as a standard error_info instance for transporting (in exceptions deriving from boost::exception) an exception_ptr to an exception nested into another exception.