//---------------------------------------------------------------------------
Author::Author(std::string const &firstname, std::string const &lastname)
: _firstname(firstname), _lastname(lastname)
{
myWait( 200 );
if (firstname.empty() || lastname.empty()) throw InvalidAuthor() ;
}
void Book::setAuthor(string author) {
if (author.empty()) throw InvalidAuthor();
else this->author = author;
}