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

error_info::value

#include <boost/exception/info.hpp>

value_type const & value() const;
value_type & value();

Description:

Returns a (const) reference to the copy of the value passed to error_info's constructor stored in the error_info object.

Throws:

Nothing.