КЛ>class MetadataType
КЛ>{
КЛ>    MetadataType();
КЛ>    MetadataType( const MetadataType& );
КЛ>    MetadataType& operator =( const MetadataType& );

КЛ>public:

КЛ>    enum Enum
КЛ>    {
КЛ>        CompanySymbol,
КЛ>        CompanyName,
КЛ>        Industry,
КЛ>        Keyword,
КЛ>        Other
КЛ>    };
КЛ>};

КЛ>

....
#if defined(WIN32)
#include <windows.h>
#define GENERIC_READ_WRITE    (GENERIC_READ|GENERIC_WRITE)
#elif defined(_POSIX_)
#include <stdio.h>     /* 'sprintf'    */
#include <unistd.h>    /* 'lseek'      */
#include <fcntl.h>     /* 'open'       */
#include <sys/stat.h>  /* 'S_IRUSR,... */
#include <sys/syslimits.h> /* 'PATH_MAX,... */
#include <errno.h>    /* 'extern int errno' */
#include <string.h>   /* "char* strerror( int errnum ); */
#define CloseHandle(x)          close(x)
#define MAX_PATH                PATH_MAX
#define INVALID_HANDLE_VALUE    (-1)
#define CREATE_NEW              O_CREAT|O_EXCL
#define CREATE_ALWAYS           O_CREAT|O_TRUNC
#define OPEN_EXISTING           0
#define OPEN_ALWAYS             O_CREAT
#define TRUNCATE_EXISTING       O_TRUNC
#define GENERIC_READ            O_RDONLY
#define GENERIC_WRITE           O_WRONLY
#define GENERIC_READ_WRITE      O_RDWR
#define FILE_BEGIN              SEEK_SET
#define FILE_CURRENT            SEEK_CUR
#define FILE_END                SEEK_END
#define FILE_FLAG_WRITE_THROUGH O_SYNC
typedef int HANDLE;
#else
#error ERROR: WIN32 or POSIX supported!
#endif


class FileOpening {
public:
    enum Enum {
        CreateNew=CREATE_NEW,              //!< Creates a new file. The function fails if the specified file already exists.
        CreateAlways=CREATE_ALWAYS,        //!< Creates a new file. If the file exists, the function overwrites the file, clears the existing attributes, and combines the file attributes and flags specified by dwFlagsAndAttributes with FILE_ATTRIBUTE_ARCHIVE.
        OpenExisting=OPEN_EXISTING,        //!< Opens the file. The function fails if the file does not exist.
        OpenAlways=OPEN_ALWAYS,            //!< Opens the file, if it exists. If the file does not exist, the function creates the file as if dwCreationDisposition were CREATE_NEW.
        TruncateExisting=TRUNCATE_EXISTING //!< Opens the file. Once opened, the file is truncated so that its size is zero bytes. The calling process must open the file with at least GENERIC_WRITE access. The function fails if the file does not exist.
    };
};


class FileAccess {
public:
    enum Enum {
        ReadOnly=GENERIC_READ,             //!< Open file for reading only.
        ReadWrite=GENERIC_READ_WRITE,      //!< Open file for reading and writing.
        WriteOnly=GENERIC_WRITE            //!< Open file for writing only.
    };
};

................

template <
    enum FileOpening::Enum OpenTraits,
    enum FileAccess::Enum  AccessTraits = FileAccess::ReadOnly,
    enum FileShare::Enum   ShareTraits  = FileShare::NoShare
> class File {
public:


................