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c++visual-studiovisual-c++enumsvisual-c++-2008
Baiyan Huang
Baiyan Huang

Reputation: 6771

Why could an enum type be used without defined

I am using VC2008 as my complier, and it is surprised to me that an enum could be used without defined:

void func(enum EnumType type)
{

}

Code above could be compiled and run without a problem, could anyone explain why it works?

Update: I could define an empty enum in C++, as follow:

enum EnumType {};

Upvotes: 0

Views: 327

Answers (1)

James McNellis
James McNellis

Reputation: 355049

This is evidently a nonstandard Visual C++ language extension.

You cannot forward declare an enum in standard C++.

Upvotes: 2

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