int GetMonth( ) const throw( )； What does throw () mean?

Reprinted address :https://blog.csdn.net/qq276592716/article/details/7625703

Abnormal specification （Exception Specifications）
throw The following specifies what types of exceptions this function is allowed to throw , Empty means no exception is thrown . After writing the function declaration like this , You are realizing GetMonth There can be no throw sentence .
If it is written as int GetMonth( ) const throw(string);
Function implementation can throw string object , Other types of objects are not allowed .