rfl::Timestamp

rfl::Timestamp is a simple wrapper around std::tm (https://en.cppreference.com/w/cpp/chrono/c/tm).

As its template parameter it includes the time stamp format for serialization and deserialization.

Here is a reference for for how you can specify the format:

https://en.cppreference.com/w/cpp/chrono/c/strftime

In fact, rfl::Timestamp calls strftime and strptime under-the-hood.

They can be used in your struct like this:

struct Person {
  rfl::Field<"birthday", rfl::Timestamp<"%Y-%m-%d">> birthday;
};

An rfl::Timestamp can be constructed from either a string or a std::tm struct.

const auto person1 = Person{.birthday = "1970-01-01"};
const auto person2 = Person{.birthday = std::tm{...}};

You can access the underlying std::tm struct using the .tm() method and you can generate the string representation using the .str() method.

const std::tm birthday = person1.birthday().tm();
std::cout << person1.birthday().str() << std::endl;

Note that constructing rfl::Timestamp from a string is convenient, but it might result in an exception.

To avoid the exception you can also use Timestamp<...>::from_string(...), which will return an rfl::Result<Timestamp<...>> or rfl::Error.

const rfl::Result<rfl::Timestamp<"%Y-%m-%d">> result = rfl::Timestamp<"%Y-%m-%d">::from_string("1970-01-01");
const rfl::Result<rfl::Timestamp<"%Y-%m-%d">> error = rfl::Timestamp<"%Y-%m-%d">::from_string("not a proper time format");