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Answer to Question #58335 in C++ for jonney

Question #58335
Take the following interfaces for an article respectively a shop selling articles:
class Article // an article
{
public:
virtual Identifier getId() = 0; // its identifier
};
class Shop // a shop
{
public:
// number n of articles in shop
virtual int numberOfArticles() = 0;
// get article i, 0 <= i < n
virtual Article* getArticle(int i) = 0;
};
Write a method
set<Identifier> getArticleIds(Shop& s);
which takes a shop s as parameter and returns as its result the set of the identifiers of all
articles contained in s.
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