Xcode: Redifinition of enumerator C??

hello,
since last time got answers (thanks),
i've got next question confusing me:

i've got file called elementstable.h, have 2 enums inside. 1 holds elements of periodic system of elements name. functions should. second enum should same, time symbol name of elements.

code:

  enum eelementssymbol {      h = 1,      he,      li,      be,      b,      c,       // carbon, error: redefinition of enumerator 'c'      n,      o,      f,      ne,      na,      mg,      al,      si,      // more symbol names  };  

anybody idea why error? , idea how "fix" this?

 

update

found error didn't understand why comes up.

have enum in file, not same project (but workspace) named eromannumbers, c defined 100.

far know/understand enumeration names "lives" inside enumerations, why double names causing error?

c++11 says explicitly compiler understand:

code:

  enum state {				enum direction {  	unknown,					unknown,  	off,						left,  	on						right  };						};    

prior c++11 there ambiguity between estate::unknown , edirection::unknown. had been resolved in c++11 , enumeration constants live in specific namespace, can global namespace , enumeration itself.

 

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