enums and namespaces

[Vincent RICHOMME]

Hi,

some questions about namespaces.
Let's say I have a class CExtPaintManager defined like this :



class CExtPaintManager
{
protected:
....

class B
{

};
public:
class C
{

};

enum e_align_t
{
__ALIGN_HORIZ_CENTER = 1,
__ALIGN_HORIZ_RIGHT = 2,
__ALIGN_VERT = 4
};

};

When I compile my sample code compiler says :
warning C4482: nonstandard extension used: enum
'CExtPaintManager::e_align_t' used in qualified name

m_nAlign = CExtPaintManager::e_align_t::__ALIGN_HORIZ_CENTER
|CExtPaintManager::e_align_t::__ALIGN_VERT;
What does it mean and how fix it ?

 

[Ivan Vecerina]

: class CExtPaintManager
: {
....
:
: enum e_align_t
: {
: __ALIGN_HORIZ_CENTER = 1,
: __ALIGN_HORIZ_RIGHT = 2,
: __ALIGN_VERT = 4
: };
:
: };
:
: When I compile my sample code compiler says :
: warning C4482: nonstandard extension used: enum
: 'CExtPaintManager::e_align_t' used in qualified name
:
: m_nAlign = CExtPaintManager::e_align_t::__ALIGN_HORIZ_CENTER
: |CExtPaintManager::e_align_t::__ALIGN_VERT;
: What does it mean and how fix it ?

In standard C++, enumeration constants are accessible
within the scope that contains the enum. The enum itself
does not define a scope. So you should write:
m_nAlign = CExtPaintManager::__ALIGN_HORIZ_CENTER
| CExtPaintManager::__ALIGN_VERT;

Another issue in the code example you posted is that
it is illegal for a standard-conformant C++ program
to use identifiers that contain two underscores,
or to use (most) identifiers that start with an underscore.


-Ivan