std::exception::operator=

exception& operator=( const exception& other ) throw();		(until C++11)
exception& operator=( const exception& other ) noexcept;		(since C++11)

Copy assignment operator. Assigns the contents of other

The effects of calling what() after assignment are implementation-defined.	(until C++11)
If `*this` and `other` both have dynamic type `std::exception` then std::strcmp(what(), other.what()) == 0 after assignment.	(since C++11)

other

another exception to assign the contents of