Einschränken von Klassenvorlagen mit C++20-Concepts

#include <iostream>
#include <concepts>
#include <string>
 
template <typename T>
concept Serialisable = requires(const T& obj) {
    { obj.serialize() } -> std::same_as<std::string>;
};
 
template <Serialisable T>
class DataExporter {
public:
    explicit DataExporter(T data) : data_(std::move(data)) {}
 
    void export_data() const {
        std::cout << "Exporting payload: " << data_.serialize() << '\n';
    }
 
private:
    T data_;
};
 
struct UserRecord {
    std::string name;
    std::string serialize() const { return "UserRecord{name: " + name + "}"; }
};
 
int main() {
    UserRecord user{"Alice"};
    DataExporter<UserRecord> exporter(user);
    exporter.export_data();
}