74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
|
// fig09_36.cpp
|
||
|
|
// Serializing and deserializing objects with the cereal library.
|
||
|
|
#include <cereal/archives/json.hpp>
|
||
|
|
#include <cereal/types/vector.hpp>
|
||
|
|
#include <fmt/format.h>
|
||
|
|
#include <fstream>
|
||
|
|
#include <iostream>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
struct Record {
|
||
|
|
int account{};
|
||
|
|
std::string first{};
|
||
|
|
std::string last{};
|
||
|
|
double balance{};
|
||
|
|
};
|
||
|
|
|
||
|
|
// function template serialize is responsible for serializing and
|
||
|
|
// deserializing Record objects to/from the specified Archive
|
||
|
|
template <typename Archive>
|
||
|
|
void serialize(Archive& archive, Record& record) {
|
||
|
|
archive(cereal::make_nvp("account", record.account),
|
||
|
|
cereal::make_nvp("first", record.first),
|
||
|
|
cereal::make_nvp("last", record.last),
|
||
|
|
cereal::make_nvp("balance", record.balance));
|
||
|
|
}
|
||
|
|
|
||
|
|
// display record at command line
|
||
|
|
void displayRecords(const std::vector<Record>& records) {
|
||
|
|
for (const auto& r : records) {
|
||
|
|
std::cout << fmt::format("{} {} {} {:.2f}\n",
|
||
|
|
r.account, r.first, r.last, r.balance);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
std::vector records{
|
||
|
|
Record{100, "Brian", "Blue", 123.45},
|
||
|
|
Record{200, "Sue", "Green", 987.65}
|
||
|
|
};
|
||
|
|
|
||
|
|
std::cout << "Records to serialize:\n";
|
||
|
|
displayRecords(records);
|
||
|
|
|
||
|
|
// serialize vector of Records to JSON and store in text file
|
||
|
|
if (std::ofstream output{"records.json"}) {
|
||
|
|
cereal::JSONOutputArchive archive{output};
|
||
|
|
archive(cereal::make_nvp("records", records)); // serialize records
|
||
|
|
}
|
||
|
|
|
||
|
|
// deserialize JSON from text file into vector of Records
|
||
|
|
if (std::ifstream input{"records.json"}) {
|
||
|
|
cereal::JSONInputArchive archive{input};
|
||
|
|
std::vector<Record> deserializedRecords{};
|
||
|
|
archive(deserializedRecords); // deserialize records
|
||
|
|
std::cout << "\nDeserialized records:\n";
|
||
|
|
displayRecords(deserializedRecords);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**************************************************************************
|
||
|
|
* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
|
||
|
|
* Pearson Education, Inc. All Rights Reserved. *
|
||
|
|
* *
|
||
|
|
* DISCLAIMER: The authors and publisher of this book have used their *
|
||
|
|
* best efforts in preparing the book. These efforts include the *
|
||
|
|
* development, research, and testing of the theories and programs *
|
||
|
|
* to determine their effectiveness. The authors and publisher make *
|
||
|
|
* no warranty of any kind, expressed or implied, with regard to these *
|
||
|
|
* programs or to the documentation contained in these books. The authors *
|
||
|
|
* and publisher shall not be liable in any event for incidental or *
|
||
|
|
* consequential damages in connection with, or arising out of, the *
|
||
|
|
* furnishing, performance, or use of these programs. *
|
||
|
|
*************************************************************************/
|