[C++17] Example of std::optional

optional_image.cpp

#include <iostream>
#include <optional>

class Image
{
public:
    Image(const std::string& path) : path(path)
    {}

    std::string getPath()
    {
        return path;
    }
    
private:
    std::string path;
};

std::optional<Image> load_image(const std::string& path)
{
    if (path == "the_image.png")
    {
        return path;
    }
    else
    {
        return std::nullopt;
    }
}

void try_to_load(const std::string& path)
{
    if (auto image = load_image(path))
    {
        std::cout << "Image loaded: " << image.value().getPath() << std::endl;
    }
    else
    {
        std::cout << "Image not found" << std::endl;
    } 
}

int main()
{
    try_to_load("the_image.png");
    try_to_load("another_image.png");
}