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The <exception_ptr> header is a non-standard header to provide the mechanism for storing exceptions and later rethrowing of exceptions so stored. This facility is provided as a non-standard header because the C++11 Standard incorporates it into the existing <exception> header.

namespace std
{
    class exception_ptr;

    exception_ptr current_exception();

    template<typename ExceptionType>
    exception_ptr copy_exception(ExceptionType e);

    void rethrow_exception(exception_ptr p);
}
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