...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::typeindex::bad_runtime_cast — Indicates that runtime_cast was unable to perform the desired cast operation because the source instance was not also an instance of the target type.
// In header: <boost/type_index/runtime_cast/reference_cast.hpp> struct bad_runtime_cast : public exception { };