namespace std {
class exception {
public:
exception() noexcept;
exception(const exception&) noexcept;
exception& operator=(const exception&) noexcept;
virtual ~exception();
virtual const char* what() const noexcept;
};
}
The class exception defines the base class for the types of objects thrown as exceptions by C++ standard library components, and certain expressions, to report errors detected during program execution.
Each standard library class T that derives from class exception shall have a publicly accessible copy constructor and a publicly accessible copy assignment operator that do not exit with an exception. These member functions shall meet the following postcondition: If two objects lhs and rhs both have dynamic type T and lhs is a copy of rhs, then strcmp(lhs.what(), rhs.what()) shall equal 0.
exception() noexcept;
Effects: Constructs an object of class exception.
exception(const exception& rhs) noexcept; exception& operator=(const exception& rhs) noexcept;
Effects: Copies an exception object.
Postconditions: If *this and rhs both have dynamic type exception then the value of the expression strcmp(what(), rhs.what()) shall equal 0.
virtual ~exception();
Effects: Destroys an object of class exception.
virtual const char* what() const noexcept;
Returns: An implementation-defined ntbs.
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