Some people prefer to place global enums inside a namespace instead:
[code=auto:0]
namespace Direction {
enum Type {
None,
Up,
Down
// ...
};
}

With C++11
you can just use
[source lang="cpp"]enum class Direction: unsigned char //You can even specify underlying data type{    None,    Up,    Down};[/source]

Note this doesn't allow implicit type conversion
[source lang="cpp"]int direction=Direction::None;//ErrorDirection direction=Direction::None//Ok[/source]

Some people prefer to place global enums inside a namespace instead:
[code=auto:0]
namespace Direction {
    enum Type {
        None,
        Up,
        Down
        // ...
    };
}

With C++11
you can just use
[source lang="cpp"]enum class Direction: unsigned char //You can even specify underlying data type {    DirectionNone,    DirectionUp,    DirectionDown};[/source]