Unicode /变量名中的特殊字符不允许在clang中使用？ [英] Unicode/special characters in variable names in clang not allowed?

问题描述

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clang now（> 3.3）支持变量名称中的Unicode字符 http://llvm.org/releases/3.3/tools/clang/docs/ReleaseNotes.html#major-new-features 。

clang now (>3.3) supports unicode characters in variable names http://llvm.org/releases/3.3/tools/clang/docs/ReleaseNotes.html#major-new-features.

但是一些特殊字符仍然是禁止的。

However some special character are still forbiden.

int main(){
    double α = 2.; // alpha, ok!
    double ∞ = 99999.; // infinity, error
}

给出：

error: non-ASCII characters are not allowed outside of literals and identifiers
        double ∞ = 99999.;

α clang ？前者是unicode，而且（无限）后者不是unicode，但是同时不是ASCII？

What is the fundamental difference between α (alpha) and ∞ (infinty) for clang? That the former is unicode and the latter is not unicode but at the same time is not ASCII?

是否有解决方法或选项允许 clang （或在 gcc 中的BTW）？

Is there a workaround or an option to allow this set of characters in clang (or BTW in gcc)?

>注意：1）∞只是一个例子，有很多字符可能有用但也被禁止，例如∫或∂。 2）我不是问是否是好主意，请把它作为一个技术问题。 3）我对Linux中的 clang 3.4 的C ++编译器感兴趣（ gcc 4.8.3 不支持） 。我使用 UTF-8 编码和 Unix / Linux 保存源文件 gedit / code>行结束。 4）添加其他正常的第一个字符没有帮助：_∞

Notes: 1) ∞ is just an example, there are a lot of characters that are potentially useful but also forbidden, like ∫ or ∂. 2) I am not asking if it is good idea, please take it as a technical question. 3) I am interested in C++ compiler of clang 3.4 in Linux (gcc 4.8.3 doesn't support this). I am saving the source files with gedit using UTF-8 encoding and Unix/Linux line ending. 4) adding other normal first characters doesn't help: _∞

答案指向一个确定的NO。一些范围的确不是
允许也不会很快。为了进一步移动到总
疯狂，最好的选择我发现是使用
字符有效地看起来相同。 （现在，这个我可能承认不是一个好主意。）这些替代品可以在这里找到
http://shapecatcher.com/ 。结果（对不起，如果它伤害你的眼睛）：

The answers point to a definite NO. Some ranges are indeed not allowed nor will they be soon. To move one step further to total craziness, the best alternative I found was to use characters that effectively look the same. (Now, this I might admit is not a good idea.) Those alternatives can be found here http://shapecatcher.com/. The result (sorry if it hurts your eyes):

//    double ∞ = 99999.; // still error
//    double ⧞ = 99999.; // infinity negated still error
  double ꝏ = 99999.; // letter oo
  double Ꝏ = 99999.; // letter OO
//    double ⧜ = 99999.; // incomplete infinity still error

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