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Often, one needs several enumerated types together. Sometimes, one has a name clash. Two solutions to this come to mind: use a namespace, or use 'larger' enum element names. Still, the namespace solution has two possible implementations: a dummy class with nested enum, or a full blown namespace. I'm looking for pros and cons of all three approaches. Example: // oft seen hand-crafted name clash solution enum eColors { cRed, cColorBlue, cGreen, cYellow, cColorsEnd }; enum eFeelings { cAngry, cFeelingBlue, cHappy, cFeelingsEnd }; void setPenColor( const eColors c ) { switch (c) { default: assert(false); break; case cRed: //... break; case cColorBlue: //... //... } } // (ab)using a class as a namespace class Colors { enum e { cRed, cBlue, cGreen, cYellow, cEnd }; }; class Feelings { enum e { cAngry, cBlue, cHappy, cEnd }; }; void setPenColor( const Colors::e c ) { switch (c) { default: assert(false); break; case Colors::cRed: //... break; case Colors::cBlue: //... //... } } // a real namespace? namespace Colors { enum e { cRed, cBlue, cGreen, cYellow, cEnd }; }; namespace Feelings { enum e { cAngry, cBlue, cHappy, cEnd }; }; void setPenColor( const Colors::e c ) { switch (c) { default: assert(false); break; case Colors::cRed: //... break; case Colors::cBlue: //... //... } }

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