Accessing an enum that is within a class that is within a namespace

Question

I am on Ubuntu 12.04 using g++ as a compiler, and I've run into a problem trying to use the Alignment enums to place my GUI objects appropriately. Here is the relevant code from guichan's graphics.hpp:

...
00053 namespace gcn
00054 {
00055     class Color;
00056     class Font;
00057     class Image;
00058 
00094     class GCN_CORE_DECLSPEC Graphics
00095     {
00096     public:
00100         enum Alignment
00101         {
00102             LEFT = 0,
00103             CENTER,
00104             RIGHT
00105         };
...

Here is the line I am using to attempt to access the CENTER.

gcn::Graphics::Alignment _align = gcn::Graphics::Alignment::CENTER;

There error I receive is:

error: ‘gcn::Graphics::Alignment’ is not a class or namespace

I hope someone can give me a hand, I've searched everywhere for a similar problem, but to no avail.

Unfortunately that doesn't work, or at least the different ways I have tried it. — slacker
– slacker, Commented Nov 10, 2013 at 0:41

Dietmar Kühl · Accepted Answer · 2013-11-10 00:40:24Z

2

The enumeration names are injected into the enclosing namespace unless you use enum class which was introduced into C++ with the 2011 revision. If you use plain enum, you just qualify the names with enclosing scope:

gcn::Graphics::CENTER

answered Nov 10, 2013 at 0:40

Dietmar Kühl

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2 Comments

WhozCraig Over a year ago

+1, Note: Declaring a different enumeration type (like enum Position { LEFT=1,...} using the same symbol(s) (LEFT in this case) is likewise not legal until the aforementioned feature of C++11 (enum class) of this answer.

slacker Over a year ago

Thank you so much, Dietmar! :D Edit: I'll bear that in mind, thank you Craig.

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