PMR showcase

#include <ios>
#include <memory_resource>
#include <iostream>
#include <vector>
#include <string>
#include <cstring>

class SongList {
public:
    SongList()
        : buffer{},
          mem_resource(buffer, sizeof(buffer), std::pmr::null_memory_resource()),
          songs(&mem_resource) 
          {
          }

    void addSong(const std::string& name) {
        songs.emplace_back(name);
    }

    const std::pmr::vector<std::pmr::string>& getSongs() const {
        return songs;
    }

    void printBuffer() const {
        std::cout << "buffer address: " << std::hex << static_cast<const void*>(buffer) << std::endl;
        for (const auto& song : songs) {
            std::cout << "Song: " << song << ", address: " << static_cast<const void*>(song.data()) << std::endl;
        }
    }

private:
    // Increase buffer size to better fit vector and string allocations
    char buffer[200];
    std::pmr::monotonic_buffer_resource mem_resource;
    std::pmr::vector<std::pmr::string> songs;
};

int main() {
    SongList songList;
    songList.addSong("Song A");
    songList.addSong("Song B");

    const auto& songs = songList.getSongs();
    std::cout << "Song list:" << std::endl;
    for (const auto& song : songs) {
        // Output the song namces
        // In a real application, you might print them or process them further
        std::cout << song << std::endl;
    }
    // Print buffer and song addresses for allocation check
    std::cout << "Buffer context:" << std::endl;
    songList.printBuffer();
    return 0;
}