12 lines
247 B
C++
12 lines
247 B
C++
#include "book.h"
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#include <iostream>
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const Book kNullBook{};
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std::ostream& operator<<(std::ostream& os, const Book& book) {
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os << "{ " << book.id << ", " << book.title << ", " << book.price << ", "
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<< book.photo << " }";
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return os;
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}
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