How to declare an enum type?

[bashill.zhu@gmail.com]

bzhu@TY-PC /h/working/tcplex/ch8/testenum
$ cat lexer.h
namespace Lexer
{
enum Token_value;
extern Token_value string_value;
void get_token();
}

bzhu@TY-PC /h/working/tcplex/ch8/testenum
$ cat lexer.cpp
#include "lexer.h"
namespace Lexer{
enum Token_value{
one,two
};
}
void Lexer::get_toke n()
{
}



bzhu@TY-PC /h/working/tcplex/ch8/testenum
$ g++ -c lexer.cpp
In file included from lexer.cpp:1:
lexer.h:3: error: use of enum `Token_value' without previous
declaration
lexer.h:4: error: `Token_value' does not name a type

Thanks !