VS10中的强类型“enum”?[复制]

http://blogs.msdn.com/vcblog/archive/2010/04/06/c-0x-core-language-features-in-vc10-the-table.aspx 有一个表显示C++在2010个RC中实现的特点。其中包括列出的转发枚举和强类型枚举,但它们被列为“部分”。文章的正文说,这意味着它们要么不完整,要么以某种非标准的方式实现。

所以我得到了VS2010RC,AM正在玩C++ 0x特性。我不知道这两个特性,也找不到关于这两个特性的任何文档。即使是最简单的尝试也无法编译。

enum class E { test };
int main() {}

fails with:

1>e:\dev_workspace\experimental\2010_feature_assessment\2010_feature_assessment\main.cpp(518): error C2332: 'enum' : missing tag name
1>e:\dev_workspace\experimental\2010_feature_assessment\2010_feature_assessment\main.cpp(518): error C2236: unexpected 'class' 'E'. Did you forget a ';'?
1>e:\dev_workspace\experimental\2010_feature_assessment\2010_feature_assessment\main.cpp(518): error C3381: 'E' : assembly access specifiers are only available in code compiled with a /clr option
1>e:\dev_workspace\experimental\2010_feature_assessment\2010_feature_assessment\main.cpp(518): error C2143: syntax error : missing ';' before '}'
1>e:\dev_workspace\experimental\2010_feature_assessment\2010_feature_assessment\main.cpp(518): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

int main()
{
  enum E : short;
}


Fails with:
1>e:\dev_workspace\experimental\2010_feature_assessment\2010_feature_assessment\main.cpp(513): warning C4480: nonstandard extension used: specifying underlying type for enum 'main::E'
1>e:\dev_workspace\experimental\2010_feature_assessment\2010_feature_assessment\main.cpp(513): error C2059: syntax error : ';'
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

因此,似乎一定是一些完全非标准的实现,让他们有理由称这个特性“部分”完成。我要如何重写代码?

有关我尝试使用的新功能的更多信息:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf

枚举的前向声明: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf