what does this mean

I understand the typedef statement, I understand the enumeration declaration. How do fmtflags and fmt_flags interact with one another!

Code:

typedef int      fmtflags;

    enum fmt_flags {
                     boolalpha     = 0x0001,
                     dec               = 0x0002,
                     fixed             = 0x0004,
                     hex               = 0x0008,
                     internal         = 0x0010,
                     left                = 0x0020,
                     oct                = 0x0040,
                     right             = 0x0080,
                     scientific       = 0x0100,
                     showbase    = 0x0200,
                     showpoint    = 0x0400,
                     showpos      = 0x0800,
                     skipws         = 0x1000,
                     unitbuf         = 0x2000,
                     uppercase    = 0x4000,
                     adjustfield    = left | right | internal,
                     basefield      = dec | oct | hex,
                     floatfield       = scientific | fixed
                    };

The answer is somewhere else in the code.

How are your hex skills? Each of these flags is represented by one bit... Each of those hex values has a single bit = one, with the remaining bits = zero.

For example 0x0002 (hexadecimal) = 0000 0000 0000 0010 (binary)