Function basics_json_example2

examples/src/basics_examples.cpp:136–164

}

void basics_json_example2()
{
    // Deserialize the booklist
    std::ifstream is("./output/store.json");
    json booklist;
    is >> booklist;

    // Use a JSONPath expression to find 
      
    // (1) The authors of books that cost less than $12
    json result = json_query(booklist, "$[*][?(@.price < 12)].author");
    std::cout << "(1) " << result << '\n';

    // (2) The number of books
    result = json_query(booklist, "$.length");
    std::cout << "(2) " << result << '\n';

    // (3) The third book
    result = json_query(booklist, "$[2]");
    std::cout << "(3) " << '\n' << pretty_print(result) << '\n';

    // (4) The authors of books that were published in 2004
    result = json_query(booklist, "$[*][?(@.date =~ /2004.*?/)].author");
    std::cout << "(4) " << result << '\n';

    // (5) The titles of all books that have ratings
    result = json_query(booklist, "$[*][?(@.ratings)].title");
    std::cout << "(5) " << result << '\n';
}

int main()
{