C++程序員的負擔

#ifndef FILESYSTEM_H
#define FILESYSTEM_H
#include <string>
#include <vector>
#include <memory>

using namespace std;

namespace FS{
    class FileSystemImpl;
    class FileSystem{
        public:
            static shared_prt<FileSystem> init_file_system(const string& configFile);
            static shared_ptr<FileSystem> mount(const string& mountPath);
            ~FileSystem();
        public:
            int create(const string& path, bool isDirectory=false);
            int delete(const string& path);
            int delete(const File& file);
            vector<File> ls(const string& path);
            vector<File> ls(const File& path);
        private:
            FileSystemImpl* impl; 
    };
    class FileImpl;
    class File{
        friend class FileSystem;
        public:
            File(string& path);
            ~File();
        public:
            int     open();
            bool    isDirectory();
            bool    isExist();
            long    length();
            long    available();
            long    position();
            void    seek(long position);
            int     read();
            int     read(char buffer[], int length);
            int     write(char buffer[], int length);
            int     flush();
            int     close();
            string& path();
        private:
            FileImpl* impl;
    };

    enum FileSystemType
    {
        LOCAL,YADFS,HDFS
    };
}
#endif