Why doesn't C++ use all uppercase enumerated values?

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Enum.5: do not use all uppercase enumerated values

Reason (reason)

Avoid conflicts with macro definitions.

Example, bad (negative example)

/ / webcolors.h (third party header)

# define RED 0xFF0000

# define GREEN 0x00FF00

# define BLUE 0x0000FF

/ / productinfo.h

/ / The following define product subtypes based on color

Enum class Product_info {RED, PURPLE, BLUE}; / / syntax errorEnforcement (implementation recommendation)

Marks all uppercase enumerated values.

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