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ArtDownloader() = default;
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virtual ~ArtDownloader() = default;
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// If no image was found it returns an empty std::string
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virtual std::string download(std::string const& artist, std::string const& album) = 0;
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// If no image was found it returns an empty std::string
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virtual std::string download_artist(std::string const& artist, std::string const& album) = 0;
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ArtDownloader(ArtDownloader const&) = delete;