std::optional example 1

optional1.cpp

#include <string>
#include <functional>
#include <iostream>
#include <optional>


std::optional<std::string> getcar(std::string value) 
{
    if (value=="Toyota")
    {
        return "I got toyota";

    }
    return {};
}

int main()
{
 std::cout << "getcar returns "  << getcar("Toyota").value_or("empty") << '\n'; 
 std::cout << "getcar returns "  << getcar("Nissan").value_or("empty") << '\n'; 
  
  return 0;
}