94 lines
3.5 KiB
C++
94 lines
3.5 KiB
C++
// fig09_37.cpp
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// Serializing and deserializing objects containing private data.
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#include <cereal/archives/json.hpp>
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#include <cereal/types/vector.hpp>
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#include <fmt/format.h>
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#include <fstream>
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#include <iostream>
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#include <string>
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#include <string_view>
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#include <vector>
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class Record {
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// declare serialize as a friend for direct access to private data
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template<typename Archive>
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friend void serialize(Archive& archive, Record& record);
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public:
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// constructor
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explicit Record(int account = 0, std::string_view first = "",
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std::string_view last = "", double balance = 0.0)
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: m_account{account}, m_first{first},
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m_last{last}, m_balance{balance} {}
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// get member functions
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int getAccount() const { return m_account; }
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const std::string& getFirst() const { return m_first; }
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const std::string& getLast() const { return m_last; }
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double getBalance() const { return m_balance; }
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private:
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int m_account{};
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std::string m_first{};
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std::string m_last{};
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double m_balance{};
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};
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// function template serialize is responsible for serializing and
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// deserializing Record objects to/from the specified Archive
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template <typename Archive>
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void serialize(Archive& archive, Record& record) {
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archive(cereal::make_nvp("account", record.m_account),
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cereal::make_nvp("first", record.m_first),
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cereal::make_nvp("last", record.m_last),
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cereal::make_nvp("balance", record.m_balance));
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}
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// display record at command line
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void displayRecords(const std::vector<Record>& records) {
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for (const auto& r : records) {
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std::cout << fmt::format("{} {} {} {:.2f}\n", r.getAccount(),
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r.getFirst(), r.getLast(), r.getBalance());
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}
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}
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int main() {
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std::vector records{
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Record{100, "Brian", "Blue", 123.45},
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Record{200, "Sue", "Green", 987.65}
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};
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std::cout << "Records to serialize:\n";
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displayRecords(records);
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// serialize vector of Records to JSON and store in text file
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if (std::ofstream output{"records2.json"}) {
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cereal::JSONOutputArchive archive{output};
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archive(cereal::make_nvp("records", records)); // serialize records
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}
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// deserialize JSON from text file into vector of Records
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if (std::ifstream input{"records2.json"}) {
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cereal::JSONInputArchive archive{input};
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std::vector<Record> deserializedRecords{};
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archive(deserializedRecords); // deserialize records
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std::cout << "\nDeserialized records:\n";
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displayRecords(deserializedRecords);
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}
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}
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/**************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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*************************************************************************/
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